Ferroelectric materials are gaining increasing attention for the development of advanced catalytic technologies due to their field-responsive polarization states.However,achieving dynamic optimization of catalytic act...Ferroelectric materials are gaining increasing attention for the development of advanced catalytic technologies due to their field-responsive polarization states.However,achieving dynamic optimization of catalytic activity using ferroelectrics remains a fundamental challenge.Inspired by the force-adaptive mechanisms of fish scales,we introduce an intracrystalline force regulation strategy to dynamically control cobalt spin states and enhance peroxymonosulfate(PMS)activation in Fenton-like processes.This approach utilizes BaTi_(0.92)Co_(0.08)O_(3-δ)(BTC-8)nano-ferroelectrics,where ultrasound irradiation generates a built-in electric field that drives electrons towards cobalt sites.This electron transfer is further facilitated by electronegativity differences between cobalt and barium/titanium ions.The resulting piezo-driven electron flow promotes continuous regeneration of high-spin Co^(2+),enhancing PMS adsorption and SO_(4)^(-)-OH bond cleavage,leading to increased production of⋅SO_(4)^(-)and singlet oxygen(^(1)O_(2))for organic pollutant degradation.Consequently,BTC-8 achieves a reaction rate(k=1.7960 min^(-1))28.93 times higher than that of pure barium titanate,surpassing previously reported PMS activation and piezocatalytic systems.This work represents a shift from static electronic structure design to dynamic electronic engineering in the development of advanced catalytic strategies for water remediation.展开更多
Elastic electronics are increasingly prevalent in information storage,smart sensing and health monitoring due to their softness,stretchability and portability.Wearable electronic devices should possess elasticity and ...Elastic electronics are increasingly prevalent in information storage,smart sensing and health monitoring due to their softness,stretchability and portability.Wearable electronic devices should possess elasticity and stretchability that align with biological tissues.Specifically,their materials should be capable of elastic strain up to 50–80%,while the devices themselves must maintain electric stability under strains that accommodate body movements[1].展开更多
Ferroelectrics(FEs)have shown great potential in sensors,actuators,and electrocaloric cooling due to their direct cross-couplings between electric polarization and mechanical,thermal,and dielectric properties[1−3]Comp...Ferroelectrics(FEs)have shown great potential in sensors,actuators,and electrocaloric cooling due to their direct cross-couplings between electric polarization and mechanical,thermal,and dielectric properties[1−3]Compared with oxide FEs,polymer FEs possess good flexible and shape adaptability,making them promising candidates for flexible electronics and biocompatible devices[4].展开更多
Perovskite optoelectronic devices,capitalizing on the exceptional light-matter interaction and semiconductor properties of perovskite materials,have emerged as transformative platforms for energy conversion,informatio...Perovskite optoelectronic devices,capitalizing on the exceptional light-matter interaction and semiconductor properties of perovskite materials,have emerged as transformative platforms for energy conversion,information storage,and photonic technologies.While material innovations and device engineering breakthroughs have propelled remarkable advancements,persistent challenges in operational stability,scalable manufacturing,and batch reproducibility continue to hinder commercial implementation.Recently,molecular ferroelectrics(MOFEs),as a class of materials characterized by polar crystal structures and switchable spontaneous polarization(P_(s)),offer novel pathways to regulate high-efficiency and stable perovskite optoelectronic devices.Here,we systematically review the application of MOFEs into diverse perovskite optoelectronic systems,emphasizing the synergistic effect between P_(s)and optoelectronic properties.We analyze MOFEs-based photodetectors spanning self-powered,X-ray,and polarized-light detectors,detailing how P_(s)and synergistic physical effects optimize device performance.For photovoltaic applications,we elucidate polarizationdriven performance enhancement mechanisms in perovskite solar cells(PSCs),including built-in field amplification,defect passivation,and stability improvement.Furthermore,we envisage the emerging applications of MOFEs in optoelectronic fields such as non-volatile memory,neuromorphic computing,and optical communication.Overall,this review furnishes valuable insights into optoelectronics and future energy.展开更多
The performance optimization of materials is an eternal theme and challenge in scientific research,which is reflected in ferroelectric filed to two hot topics of enhancing Curie temperature(TC)and functional versatili...The performance optimization of materials is an eternal theme and challenge in scientific research,which is reflected in ferroelectric filed to two hot topics of enhancing Curie temperature(TC)and functional versatility.The former one vitally determines ferroelectric operational temperature range while the latter would open up new application possibilities.Effective chemical modification or doping strategies on A-site and X-site components have been successfully developed in hybrid organic-inorganic perovskite(HOIP)ferroelectrics,however,the important role of adjusting B-site ions has long been overlooked.Here,we have implemented regulation on the ion radius of the B-site component to successfully obtain two new HOIP ferroelectrics(3-pyrrolinium)BBr_(3)(B=Mn and Ni).Compared to parent(3-pyrrolinium)CdBr_(3),the TC(△T=99 K)was significantly optimized by replacing the Cd^(2+)with smaller Mn^(2+)or Ni^(2+)ions.More strikingly,the introduction of Mn^(2+)and Ni^(2+)ions with octahedral coordination bring out intriguing red emission and magnetism respectively,making the multifunctional integration in a single material for multiple uses.This work provides a feasible strategy for performance optimizing of HOIP ferroelectrics,and would shed light for constructing multifunctional ferroelectrics.展开更多
As electronic technology continues to evolve towards miniaturization and integration,the demand for micro-refrigeration technology in microelectronic systems is increasing.Ferroelectric(FE)refrigeration technology bas...As electronic technology continues to evolve towards miniaturization and integration,the demand for micro-refrigeration technology in microelectronic systems is increasing.Ferroelectric(FE)refrigeration technology based on the electrocaloric effect(ECE)has emerged as a highly promising candidate in this field,due to its advantages of high energy efficiency,simple structure,easy miniaturization,low cost,and environmental friendliness.The EC performance of FE materials essentially depends on the phase transition features under the coupled electric and thermal fields,making the E–T phase diagram a core tool for decoding the underlying mechanism of ECE.This paper reviews the development of EC materials,focusing on the comprehensive study of E–T phase diagrams.By correlating the microscopic phase structure of FE materials with the macroscopic physical properties,it clarifies the manipulation mechanism for enhanced ECE performance,providing theoretical support for the targeted design of high-performance EC materials.In the future,the introduction of data-driven methods is expected to enable the high-throughput construction of FE phase diagrams,thereby accelerating the optimization of high-performance EC materials and promoting the practical application of FE refrigeration technology.展开更多
Chloride-based solid electrolytes are considered promising candidates for next-generation high-energy-density all-solid-state batteries(ASSBs).However,their relatively low oxidative decomposition threshold(~4.2 V vs.L...Chloride-based solid electrolytes are considered promising candidates for next-generation high-energy-density all-solid-state batteries(ASSBs).However,their relatively low oxidative decomposition threshold(~4.2 V vs.Li^(+)/Li)constrains their use in ultrahighvoltage systems(e.g.,4.8 V).In this work,ferroelectric Ba TiO_(3)(BTO)nanoparticles with optimized thickness of~50-100 nm were successfully coated onto Li_(2.5)Y_(0.5)Zr_(0.5)Cl_(6)(LYZC@5BTO)electrolytes using a time-efficient ball-milling process.The nanoparticle-induced interfacial ionic conduction enhancement mechanism contributed to the preservation of LYZC’s high ionic conductivity,which remained at 1.06 m S cm^(-1)for LYZC@5BTO.Furthermore,this surface electric field engineering strategy effectively mitigates the voltage-induced self-decomposition of chloride-based solid electrolytes,suppresses parasitic interfacial reactions with single-crystal NCM811(SCNCM811),and inhibits the irreversible phase transition of SCNCM811.Consequently,the cycling stability of LYZC under high-voltage conditions(4.8 V vs.Li+/Li)is significantly improved.Specifically,ASSB cells employing LYZC@5BTO exhibited a superior discharge capacity of 95.4 m Ah g^(-1)over 200 cycles at 1 C,way outperforming cell using pristine LYZC that only shows a capacity of 55.4 m Ah g^(-1).Furthermore,time-of-flight secondary ion mass spectrometry and X-ray photoelectron spectroscopy analysis revealed that Metal-O-Cl by-products from cumulative interfacial side reactions accounted for 6% of the surface species initially,rising to 26% after 200 cycles in pristine LYZC.In contrast,LYZC@5BTO limited this increase to only 14%,confirming the effectiveness of BTO in stabilizing the interfacial chemistry.This electric field modulation strategy offers a promising route toward the commercialization of high-voltage solid-state electrolytes and energy-dense ASSBs.展开更多
BiMeO_(3)–PbTiO_(3)(where Me represents transition metals)perovskite-type thin films have been widely studied due to their superior ferroelectric properties,including robust ferroelectric polarization and high Curie ...BiMeO_(3)–PbTiO_(3)(where Me represents transition metals)perovskite-type thin films have been widely studied due to their superior ferroelectric properties,including robust ferroelectric polarization and high Curie temperatures.In this study,PbTiO_(3)-based perovskite thin films of xBi(Cu_(1/2)Zr_(1/2))O_(3)–(1-x)PbTiO_(3)(xBCZ–(1-x)PT)were designed and prepared on Pt(111)/Ti/SiO_2/Si substrates using the conventional sol–gel method.The x BCZ–(1-x)PT thin films demonstrate remarkable crystallinity,characterized by a perovskite structure and a dense microstructure,which contribute to their highperformance ferroelectric and fatigue properties.Notably,the thin films exhibit large remnant polarization(2P_(r0))values,reaching 98μC·cm^(-2)and 74μC·cm^(-2)for the 0.05BCZ–0.95PT and 0.1BCZ–0.9PT compositions,respectively.Furthermore,the thin films also demonstrate a high Curie temperature(T_(C)=510℃),as well as favorable fatigue properties and low leakage current,suggesting their potential applicability in ferroelectric devices.展开更多
Dielectric ceramic capacitors have attracted significant interest in advanced pulsed power systems owing to their ultrahigh power density and fast charge/discharge capabilities. The low breakdown strength(E_(b)) of di...Dielectric ceramic capacitors have attracted significant interest in advanced pulsed power systems owing to their ultrahigh power density and fast charge/discharge capabilities. The low breakdown strength(E_(b)) of dielectric ceramics poses a major bottleneck for achieving high recoverable energy storage density(W rec). In this study, using ingenious chemical component design, we achieved an ultrahigh Eb of 800 kV/cm and an excellent W rec value of 9.48 J/cm^(3) in the simple component 0.92NaNbO_(3)–0.08SmFeO_(3) ceramic. Finite element simulations corroborate that the optimized grain boundary network enables more uniform electric field distribution and effective suppression of breakdown propagation. The superior energy storage characteristics originate from two synergistic mechanisms:(Ι) the incorporation of SmFeO_(3) suppresses grain growth, resulting in refined microstructure with increased grain boundary density that substantially enhances E_(b);(II) the introduction of Sm^(3+) and Fe^(3+) ions causes a mismatch between the A/B site ions, inducing lattice distortion and high disorder, which enhances the local random fields and relaxor behavior. This study establishes a promising pathway for designing high-energy-density dielectric ceramic capacitors.展开更多
Advanced lead-free energy storage ceramics play an indispensable role in next-generation pulse power capacitors market.Here,an ultrahigh energy storage density of~13.8 J cm^(-3)and a large efficiency of~82.4%are achie...Advanced lead-free energy storage ceramics play an indispensable role in next-generation pulse power capacitors market.Here,an ultrahigh energy storage density of~13.8 J cm^(-3)and a large efficiency of~82.4%are achieved in high-entropy lead-free relaxor ferroelectrics by increasing configuration entropy,named high-entropy strategy,realizing nearly ten times growth of energy storage density compared with low-entropy material.Evolution of energy storage performance and domain structure with increasing configuration entropy is systematically revealed for the first time.The achievement of excellent energy storage properties should be attributed to the enhanced random field,decreased nanodomain size,strong multiple local distortions,and improved breakdown field.Furthermore,the excellent frequency and fatigue stability as well as charge/discharge properties with superior thermal stability are also realized.The significantly enhanced comprehensive energy storage performance by increasing configuration entropy demonstrates that high entropy is an effective but convenient strategy to design new high-performance dielectrics,promoting the development of advanced capacitors.展开更多
Ultrafast charge/discharge process and ultrahigh power density enable dielectrics essential components in modern electrical and electronic devices, especially in pulse power systems. However, in recent years, the ener...Ultrafast charge/discharge process and ultrahigh power density enable dielectrics essential components in modern electrical and electronic devices, especially in pulse power systems. However, in recent years, the energy storage performances of present dielectrics are increasingly unable to satisfy the growing demand for miniaturization and integration, which stimulates further researches on dielectrics with higher energy density and efficiency.Among various inorganic dielectrics, perovskite relaxor ferroelectrics are recognized as promising candidates for energy storage applications, with high permittivity and relatively high efficiency. Here, we focus on recent progress and achievements on optimizing perovskite relaxor ferroelectrics toward better energy storage capability through hierarchical design. The principles and key parameters of dielectric energy storage, together with the definition of majority types of dielectrics, are introduced at first. Strategies within various scales include domain, grain size, orientation, and composite engineering are summarized. The existing challenges are presented and future prospects are proposed in the end, with the background of both academic explorations and industrial applications.展开更多
Two-dimensional （2D） materials, such as graphene and MoS2 related transition metal dichalcogenides （TMDC）, have attracted much attention for their potential applications. Ferroelectrics, one of the special and tra...Two-dimensional （2D） materials, such as graphene and MoS2 related transition metal dichalcogenides （TMDC）, have attracted much attention for their potential applications. Ferroelectrics, one of the special and traditional dielectric materials, possess a spontaneous electric polarization that can be reversed by the application of an external electric field. In recent years, a new type of device, combining 2D materials with ferroelectrics, has been fabricated. Many novel devices have been fabricated, such as low power consumption memory devices, highly sensitive photo-transistors, etc. using this technique of hybrid systems incorporating ferroelectrics and 2D materials. This paper reviews two types of devices based on field effect transistor （FET） structures with ferroelectric gate dielectric construction （termed FeFET）. One type of device is for logic applications, such as a graphene and TMDC FeFET for fabricating memory units. Another device is for optoelectric applications, such as high performance phototransistors using a graphene p-n junction. Finally, we discuss the prospects for future applications of 2D material FeFET.展开更多
基金the National Natural Science Foundation of China(Grant No.U2002217,52102342,52103024 and 12404116)Key Research Program of the Chinese Academy of Sciences(Grant No.ZDRW-CN2021-3-1-18)+5 种基金Chenguang Program of Shanghai Education Development Foundation,Shanghai Municipal Education Commission(Grant No.21CGA40)9th Young Elite Scientists Sponsorship Program by CAST(Grant No.2023QNRC001)10th Young Elite Scientists Sponsorship Program by CAST(Grant No.YESS20240270)the Postdoctoral Fellowship Program of CPSF(Grant No.GZC20232832)Donghua University 2024 Cultivation Project of Discipline Innovation(Grant No.xkcx-202413)Student Training Program for Innovation and Entrepreneurship of Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences(Grant No.CXCY20230305).
文摘Ferroelectric materials are gaining increasing attention for the development of advanced catalytic technologies due to their field-responsive polarization states.However,achieving dynamic optimization of catalytic activity using ferroelectrics remains a fundamental challenge.Inspired by the force-adaptive mechanisms of fish scales,we introduce an intracrystalline force regulation strategy to dynamically control cobalt spin states and enhance peroxymonosulfate(PMS)activation in Fenton-like processes.This approach utilizes BaTi_(0.92)Co_(0.08)O_(3-δ)(BTC-8)nano-ferroelectrics,where ultrasound irradiation generates a built-in electric field that drives electrons towards cobalt sites.This electron transfer is further facilitated by electronegativity differences between cobalt and barium/titanium ions.The resulting piezo-driven electron flow promotes continuous regeneration of high-spin Co^(2+),enhancing PMS adsorption and SO_(4)^(-)-OH bond cleavage,leading to increased production of⋅SO_(4)^(-)and singlet oxygen(^(1)O_(2))for organic pollutant degradation.Consequently,BTC-8 achieves a reaction rate(k=1.7960 min^(-1))28.93 times higher than that of pure barium titanate,surpassing previously reported PMS activation and piezocatalytic systems.This work represents a shift from static electronic structure design to dynamic electronic engineering in the development of advanced catalytic strategies for water remediation.
基金supported by generous grants from the Natural Science Foundation of Zhejiang Province(LR24E030003)Zhejiang Province Qianjiang Talent Program(ZJ-QJRC-2020-32).
文摘Elastic electronics are increasingly prevalent in information storage,smart sensing and health monitoring due to their softness,stretchability and portability.Wearable electronic devices should possess elasticity and stretchability that align with biological tissues.Specifically,their materials should be capable of elastic strain up to 50–80%,while the devices themselves must maintain electric stability under strains that accommodate body movements[1].
基金support from the Natural Science Fund for Colleges and Universities in Jiangsu Province(24KJB430029)the Start-up Foundation of Recruiting Talents of Nanjing University of Posts and Telecommunications(NY224032,NY225006).
文摘Ferroelectrics(FEs)have shown great potential in sensors,actuators,and electrocaloric cooling due to their direct cross-couplings between electric polarization and mechanical,thermal,and dielectric properties[1−3]Compared with oxide FEs,polymer FEs possess good flexible and shape adaptability,making them promising candidates for flexible electronics and biocompatible devices[4].
基金financially supported by the National Natural Science Foundation of China(No.52302229)the State Key Laboratory of Photovoltaic Science and Technology of China(No.202401030301)the Key Lab of Modern Optical Technologies of Education Ministry of China,Soochow University(No.KJS2425)。
文摘Perovskite optoelectronic devices,capitalizing on the exceptional light-matter interaction and semiconductor properties of perovskite materials,have emerged as transformative platforms for energy conversion,information storage,and photonic technologies.While material innovations and device engineering breakthroughs have propelled remarkable advancements,persistent challenges in operational stability,scalable manufacturing,and batch reproducibility continue to hinder commercial implementation.Recently,molecular ferroelectrics(MOFEs),as a class of materials characterized by polar crystal structures and switchable spontaneous polarization(P_(s)),offer novel pathways to regulate high-efficiency and stable perovskite optoelectronic devices.Here,we systematically review the application of MOFEs into diverse perovskite optoelectronic systems,emphasizing the synergistic effect between P_(s)and optoelectronic properties.We analyze MOFEs-based photodetectors spanning self-powered,X-ray,and polarized-light detectors,detailing how P_(s)and synergistic physical effects optimize device performance.For photovoltaic applications,we elucidate polarizationdriven performance enhancement mechanisms in perovskite solar cells(PSCs),including built-in field amplification,defect passivation,and stability improvement.Furthermore,we envisage the emerging applications of MOFEs in optoelectronic fields such as non-volatile memory,neuromorphic computing,and optical communication.Overall,this review furnishes valuable insights into optoelectronics and future energy.
基金financially supported by the National Natural Science Foundation of China(Nos.22375182,92056112 and 21991141).
文摘The performance optimization of materials is an eternal theme and challenge in scientific research,which is reflected in ferroelectric filed to two hot topics of enhancing Curie temperature(TC)and functional versatility.The former one vitally determines ferroelectric operational temperature range while the latter would open up new application possibilities.Effective chemical modification or doping strategies on A-site and X-site components have been successfully developed in hybrid organic-inorganic perovskite(HOIP)ferroelectrics,however,the important role of adjusting B-site ions has long been overlooked.Here,we have implemented regulation on the ion radius of the B-site component to successfully obtain two new HOIP ferroelectrics(3-pyrrolinium)BBr_(3)(B=Mn and Ni).Compared to parent(3-pyrrolinium)CdBr_(3),the TC(△T=99 K)was significantly optimized by replacing the Cd^(2+)with smaller Mn^(2+)or Ni^(2+)ions.More strikingly,the introduction of Mn^(2+)and Ni^(2+)ions with octahedral coordination bring out intriguing red emission and magnetism respectively,making the multifunctional integration in a single material for multiple uses.This work provides a feasible strategy for performance optimizing of HOIP ferroelectrics,and would shed light for constructing multifunctional ferroelectrics.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.U25A20232,52325208,52173217,52202128)the Interdisciplinary Research Project for Young Teachers of USTB(Grant No.FRF-IDRY24-002)。
文摘As electronic technology continues to evolve towards miniaturization and integration,the demand for micro-refrigeration technology in microelectronic systems is increasing.Ferroelectric(FE)refrigeration technology based on the electrocaloric effect(ECE)has emerged as a highly promising candidate in this field,due to its advantages of high energy efficiency,simple structure,easy miniaturization,low cost,and environmental friendliness.The EC performance of FE materials essentially depends on the phase transition features under the coupled electric and thermal fields,making the E–T phase diagram a core tool for decoding the underlying mechanism of ECE.This paper reviews the development of EC materials,focusing on the comprehensive study of E–T phase diagrams.By correlating the microscopic phase structure of FE materials with the macroscopic physical properties,it clarifies the manipulation mechanism for enhanced ECE performance,providing theoretical support for the targeted design of high-performance EC materials.In the future,the introduction of data-driven methods is expected to enable the high-throughput construction of FE phase diagrams,thereby accelerating the optimization of high-performance EC materials and promoting the practical application of FE refrigeration technology.
基金financially supported by Shenzhen Science and Technology Program(JCYJ20240813142900001)Guangdong Provincial Key Laboratory of New Energy Materials Service Safety。
文摘Chloride-based solid electrolytes are considered promising candidates for next-generation high-energy-density all-solid-state batteries(ASSBs).However,their relatively low oxidative decomposition threshold(~4.2 V vs.Li^(+)/Li)constrains their use in ultrahighvoltage systems(e.g.,4.8 V).In this work,ferroelectric Ba TiO_(3)(BTO)nanoparticles with optimized thickness of~50-100 nm were successfully coated onto Li_(2.5)Y_(0.5)Zr_(0.5)Cl_(6)(LYZC@5BTO)electrolytes using a time-efficient ball-milling process.The nanoparticle-induced interfacial ionic conduction enhancement mechanism contributed to the preservation of LYZC’s high ionic conductivity,which remained at 1.06 m S cm^(-1)for LYZC@5BTO.Furthermore,this surface electric field engineering strategy effectively mitigates the voltage-induced self-decomposition of chloride-based solid electrolytes,suppresses parasitic interfacial reactions with single-crystal NCM811(SCNCM811),and inhibits the irreversible phase transition of SCNCM811.Consequently,the cycling stability of LYZC under high-voltage conditions(4.8 V vs.Li+/Li)is significantly improved.Specifically,ASSB cells employing LYZC@5BTO exhibited a superior discharge capacity of 95.4 m Ah g^(-1)over 200 cycles at 1 C,way outperforming cell using pristine LYZC that only shows a capacity of 55.4 m Ah g^(-1).Furthermore,time-of-flight secondary ion mass spectrometry and X-ray photoelectron spectroscopy analysis revealed that Metal-O-Cl by-products from cumulative interfacial side reactions accounted for 6% of the surface species initially,rising to 26% after 200 cycles in pristine LYZC.In contrast,LYZC@5BTO limited this increase to only 14%,confirming the effectiveness of BTO in stabilizing the interfacial chemistry.This electric field modulation strategy offers a promising route toward the commercialization of high-voltage solid-state electrolytes and energy-dense ASSBs.
基金Project supported by the National Key Research and Development Program of China(Grant No.2021YFA1400300)the National Natural Science Foundation of China(Grant Nos.22271309,12304268,12261131499,and 11921004)the China Postdoctoral Science Foundation(Grant No.2023M743741)。
文摘BiMeO_(3)–PbTiO_(3)(where Me represents transition metals)perovskite-type thin films have been widely studied due to their superior ferroelectric properties,including robust ferroelectric polarization and high Curie temperatures.In this study,PbTiO_(3)-based perovskite thin films of xBi(Cu_(1/2)Zr_(1/2))O_(3)–(1-x)PbTiO_(3)(xBCZ–(1-x)PT)were designed and prepared on Pt(111)/Ti/SiO_2/Si substrates using the conventional sol–gel method.The x BCZ–(1-x)PT thin films demonstrate remarkable crystallinity,characterized by a perovskite structure and a dense microstructure,which contribute to their highperformance ferroelectric and fatigue properties.Notably,the thin films exhibit large remnant polarization(2P_(r0))values,reaching 98μC·cm^(-2)and 74μC·cm^(-2)for the 0.05BCZ–0.95PT and 0.1BCZ–0.9PT compositions,respectively.Furthermore,the thin films also demonstrate a high Curie temperature(T_(C)=510℃),as well as favorable fatigue properties and low leakage current,suggesting their potential applicability in ferroelectric devices.
基金supported by the National Natural Science Foundation of China (Grant Nos.52462018,52162019)the Key Project of the Natural Science Foundation of Jiangxi Province (Grant No.20252BAC250038)the Science Fund for Distinguished Young Scholars of Jiangxi Province (Grant No.20224ACB214007)。
文摘Dielectric ceramic capacitors have attracted significant interest in advanced pulsed power systems owing to their ultrahigh power density and fast charge/discharge capabilities. The low breakdown strength(E_(b)) of dielectric ceramics poses a major bottleneck for achieving high recoverable energy storage density(W rec). In this study, using ingenious chemical component design, we achieved an ultrahigh Eb of 800 kV/cm and an excellent W rec value of 9.48 J/cm^(3) in the simple component 0.92NaNbO_(3)–0.08SmFeO_(3) ceramic. Finite element simulations corroborate that the optimized grain boundary network enables more uniform electric field distribution and effective suppression of breakdown propagation. The superior energy storage characteristics originate from two synergistic mechanisms:(Ι) the incorporation of SmFeO_(3) suppresses grain growth, resulting in refined microstructure with increased grain boundary density that substantially enhances E_(b);(II) the introduction of Sm^(3+) and Fe^(3+) ions causes a mismatch between the A/B site ions, inducing lattice distortion and high disorder, which enhances the local random fields and relaxor behavior. This study establishes a promising pathway for designing high-energy-density dielectric ceramic capacitors.
基金supported by the National Natural Science Foundation of China(Grant Nos.21825102,22235002,52172181,and 22105017)Key R&D Plan of the Ministry of Science and Technology of China(Grant No.2022YFB3204000)。
文摘Advanced lead-free energy storage ceramics play an indispensable role in next-generation pulse power capacitors market.Here,an ultrahigh energy storage density of~13.8 J cm^(-3)and a large efficiency of~82.4%are achieved in high-entropy lead-free relaxor ferroelectrics by increasing configuration entropy,named high-entropy strategy,realizing nearly ten times growth of energy storage density compared with low-entropy material.Evolution of energy storage performance and domain structure with increasing configuration entropy is systematically revealed for the first time.The achievement of excellent energy storage properties should be attributed to the enhanced random field,decreased nanodomain size,strong multiple local distortions,and improved breakdown field.Furthermore,the excellent frequency and fatigue stability as well as charge/discharge properties with superior thermal stability are also realized.The significantly enhanced comprehensive energy storage performance by increasing configuration entropy demonstrates that high entropy is an effective but convenient strategy to design new high-performance dielectrics,promoting the development of advanced capacitors.
基金financially supported by the National Natural Science Foundation of China (No.51788104)。
文摘Ultrafast charge/discharge process and ultrahigh power density enable dielectrics essential components in modern electrical and electronic devices, especially in pulse power systems. However, in recent years, the energy storage performances of present dielectrics are increasingly unable to satisfy the growing demand for miniaturization and integration, which stimulates further researches on dielectrics with higher energy density and efficiency.Among various inorganic dielectrics, perovskite relaxor ferroelectrics are recognized as promising candidates for energy storage applications, with high permittivity and relatively high efficiency. Here, we focus on recent progress and achievements on optimizing perovskite relaxor ferroelectrics toward better energy storage capability through hierarchical design. The principles and key parameters of dielectric energy storage, together with the definition of majority types of dielectrics, are introduced at first. Strategies within various scales include domain, grain size, orientation, and composite engineering are summarized. The existing challenges are presented and future prospects are proposed in the end, with the background of both academic explorations and industrial applications.
基金Project supported by the Major State Basic Research Development Program of China(Grant Nos.2013CB922302 and 2016YFA0203900)the Natural Science Foundation of China(Grant Nos.11322441,614404147,61574152,and 61674157)the Key Research Project of Frontier Science of Chinese Academy of Sciences(Grant Nos.QYZDB-SSW-JSC016 and QYZDB-SSW-JSC031)
文摘Two-dimensional （2D） materials, such as graphene and MoS2 related transition metal dichalcogenides （TMDC）, have attracted much attention for their potential applications. Ferroelectrics, one of the special and traditional dielectric materials, possess a spontaneous electric polarization that can be reversed by the application of an external electric field. In recent years, a new type of device, combining 2D materials with ferroelectrics, has been fabricated. Many novel devices have been fabricated, such as low power consumption memory devices, highly sensitive photo-transistors, etc. using this technique of hybrid systems incorporating ferroelectrics and 2D materials. This paper reviews two types of devices based on field effect transistor （FET） structures with ferroelectric gate dielectric construction （termed FeFET）. One type of device is for logic applications, such as a graphene and TMDC FeFET for fabricating memory units. Another device is for optoelectric applications, such as high performance phototransistors using a graphene p-n junction. Finally, we discuss the prospects for future applications of 2D material FeFET.
