Small-molecule ionic liquids(ILs)are frequently employed as efficient bulk phase modifiers for perovskite materials.However,their inherent characteristics,such as high volatility and ion migration properties,pose chal...Small-molecule ionic liquids(ILs)are frequently employed as efficient bulk phase modifiers for perovskite materials.However,their inherent characteristics,such as high volatility and ion migration properties,pose challenges in addressing the stability issues associated with perovskite solar cells(PSCs).In this study,we design a poly(IL)with multiple active sites,named poly[4-styrenesulfonyl(trifluoromethylsulfonyl)imide]pyri-dine(P[STFSI][PPyri]),as an efficient additive of perovskite materials.The S=O in the sulfonyl group chelates with uncoordinated Pb^(2+)and forms hydrogen bonds with the organic cations in the perovskite,suppressing the volatilization of the organic cations.The N+in pyridine can fix halide ions through electrostatic interaction with I-and Br-ions to prevent halide ion migration.P[STFSI][PPyri]demonstrates the ability to passivate defects and suppress nonradiative recombination in PSCs.Additionally,it facilitates the fixation of organic and halide ions,thereby enhancing the device’s stability and photoelectric performance.Consequently,the introduction of P[STFSI][PPyri]as a dopant in the devices resulted in an excellent efficiency of 24.62%,demonstrating outstanding long-term operational stability,with the encapsulated device maintaining 87.6%of its initial effi-ciency even after 1500 h of continuous maximum power point tracking.This strategy highlights the promising potential of poly(IL)as an effective additive for PSCs,providing a combination of high performance and stabil-ity.展开更多
The exploration of advanced materials through rational structure/phase design is the key to develop highperformance lithium-ion capacitors(LICs).However,high complexity of material preparation and difficulty in quanti...The exploration of advanced materials through rational structure/phase design is the key to develop highperformance lithium-ion capacitors(LICs).However,high complexity of material preparation and difficulty in quantity production largely hinder the further development.Herein,Cu_(5)FeS_(4-x)/C(CFS@C)heterojunction with rich sulfur vacancies has successfully achieved from natural bornite,presenting low costeffective and bulk-production prospect.Density functional theory(DFT)calculations indicate that rich vacancies in bulk phase can decrease band gap of bornite and thus improve its intrinsic electron conductivity,as well as the heterojunction spontaneously evokes a built-in electric field between its interfacial region,largely reducing the migration barrier from 1.27 e V to 0.75 e V.Benefited from these merits,the CFS@C electrodes deliver outperformed lithium storage performance,e.g.,high reversible capacity(822.4m Ah/g at 0.1 A/g),excellent cycling stability(up to 820 cycles at 2 A/g and 540 cycles at 5 A/g with respective capacity retention of over or nearly 100%).With CFS@C as anode and porous carbon nanosheets(PCS)as cathode,the assembled CFS@C//PCS LIC full cells exhibit high energy/power density characteristics of 139.2 Wh/kg at 2500 W/kg.This work is expected to offer significant insights into structure modifications/devising toward natural minerals for advanced energy-storage systems.展开更多
Sodium-ion batteries(SIBs)with advantages of abundant resource and low cost have emerged as promising candidates for the next-generation energy storage systems.However,safety issues existing in electrolytes,anodes,and...Sodium-ion batteries(SIBs)with advantages of abundant resource and low cost have emerged as promising candidates for the next-generation energy storage systems.However,safety issues existing in electrolytes,anodes,and cathodes bring about frequent accidents regarding battery fires and explosions and impede the development of high-performance SIBs.Therefore,safety analysis and high-safety battery design have become prerequisites for the development of advanced energy storage systems.The reported reviews that only focus on a specific issue are difficult to provide overall guidance for building high-safety SIBs.To overcome the limitation,this review summarizes the recent research progress from the perspective of key components of SIBs for the first time and evaluates the characteristics of various improvement strategies.By orderly analyzing the root causes of safety problems associated with different components in SIBs(including electrolytes,anodes,and cathodes),corresponding improvement strategies for each component were discussed systematically.In addition,some noteworthy points and perspectives including the chain reaction between security issues and the selection of improvement strategies tailored to different needs have also been proposed.In brief,this review is designed to deepen our understanding of the SIBs safety issues and provide guidance and assistance for designing high-safety SIBs.展开更多
Mciro-arc oxidation（MAO）was used to coat porous films on the surface of a Zr-based bulk metallic glass sample.The compressive test results indicated that,compared with the as-cast sample,the MAO treated one exhibite...Mciro-arc oxidation（MAO）was used to coat porous films on the surface of a Zr-based bulk metallic glass sample.The compressive test results indicated that,compared with the as-cast sample,the MAO treated one exhibited higher deformation capacity,associated with multiple shear bands with higher density on the side surface and well-developed vein patterns with smaller size on the fractured surface.The pore in the MAOed film and the matrix/coating interface initiated the shear bands and impeded the rapid propagation of shear bands,thus favoring the enhanced plasticity of the MAO treated sample.The obtained results demonstrated that MAO can be considered as an effective method to finely tune the mechanical performance of monolithic bulk metallic glasses.展开更多
Degradable rotator cuff patches,followed over five years,have been observed to exhibit high re-tear rates exceeding 50%,which is attributed to the inability of degradable polymers alone to restore the post-rotator cuf...Degradable rotator cuff patches,followed over five years,have been observed to exhibit high re-tear rates exceeding 50%,which is attributed to the inability of degradable polymers alone to restore the post-rotator cuff tear(RCT)inflammatory niche.Herein,poly(ester-ferulic acid-urethane)urea(PEFUU)was developed,featuring prolonged anti-inflammatory functionality,achieved by the integration of ferulic acid(FA)into the polyurethane repeating units.PEFUU stably releases FA in vitro,reversing the inflammatory niche produced by M1 macrophages and restoring the directed differentiation of stem cells.Utilizing PEFUU,hierarchical composite nanofiber patch(HCNP)was fabricated,simulating the natural microstructure of the tendon-to-bone interface with an aligned-random alignment.The incorporation of enzymatic hydrolysate derived from decellularized Wharton jelly tissue into the random layer could further enhance cartilage regeneration at the tendon-to-bone interface.Via rat RCT repairing model,HCNP possessing prolonged anti-inflammatory properties uniquely facilitated physiological healing at the tendon-to-bone interface’s microstructure.The alignment of fibers was restored,and histologically,the characteristic tripartite distribution of collagen I-collagen II-collagen I was achieved.This study offers a universal approach to the functionalization of degradable polymers and provides a foundational reference for their future applications in promoting the in vivo regeneration of musculoskeletal tissues.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.22261142666,52372225,52172237,22305191,21975205)the Science,Technology,and Innovation Commission of Shenzhen Municipality(Grant No.GJHZ20220913143204008)+1 种基金the Shaanxi Science Fund for Distinguished Young Scholars(Grant No.2022JC-21)Open Project of State Key Laboratory of Supramolecular Structure and Materials(Grant No.sklssm2022022).
文摘Small-molecule ionic liquids(ILs)are frequently employed as efficient bulk phase modifiers for perovskite materials.However,their inherent characteristics,such as high volatility and ion migration properties,pose challenges in addressing the stability issues associated with perovskite solar cells(PSCs).In this study,we design a poly(IL)with multiple active sites,named poly[4-styrenesulfonyl(trifluoromethylsulfonyl)imide]pyri-dine(P[STFSI][PPyri]),as an efficient additive of perovskite materials.The S=O in the sulfonyl group chelates with uncoordinated Pb^(2+)and forms hydrogen bonds with the organic cations in the perovskite,suppressing the volatilization of the organic cations.The N+in pyridine can fix halide ions through electrostatic interaction with I-and Br-ions to prevent halide ion migration.P[STFSI][PPyri]demonstrates the ability to passivate defects and suppress nonradiative recombination in PSCs.Additionally,it facilitates the fixation of organic and halide ions,thereby enhancing the device’s stability and photoelectric performance.Consequently,the introduction of P[STFSI][PPyri]as a dopant in the devices resulted in an excellent efficiency of 24.62%,demonstrating outstanding long-term operational stability,with the encapsulated device maintaining 87.6%of its initial effi-ciency even after 1500 h of continuous maximum power point tracking.This strategy highlights the promising potential of poly(IL)as an effective additive for PSCs,providing a combination of high performance and stabil-ity.
基金supported by the National Natural Science Foundation of China(Nos.52004338,22378431)Hunan Provincial Natural Science Foundation(Nos.2022JJ20075,2023JJ40210)+1 种基金Scientific Research Fund of Hunan Provincial Education Department(No.21B0017)Central South University Innovation-Driven Research Programme(No.2023CXQD008)。
文摘The exploration of advanced materials through rational structure/phase design is the key to develop highperformance lithium-ion capacitors(LICs).However,high complexity of material preparation and difficulty in quantity production largely hinder the further development.Herein,Cu_(5)FeS_(4-x)/C(CFS@C)heterojunction with rich sulfur vacancies has successfully achieved from natural bornite,presenting low costeffective and bulk-production prospect.Density functional theory(DFT)calculations indicate that rich vacancies in bulk phase can decrease band gap of bornite and thus improve its intrinsic electron conductivity,as well as the heterojunction spontaneously evokes a built-in electric field between its interfacial region,largely reducing the migration barrier from 1.27 e V to 0.75 e V.Benefited from these merits,the CFS@C electrodes deliver outperformed lithium storage performance,e.g.,high reversible capacity(822.4m Ah/g at 0.1 A/g),excellent cycling stability(up to 820 cycles at 2 A/g and 540 cycles at 5 A/g with respective capacity retention of over or nearly 100%).With CFS@C as anode and porous carbon nanosheets(PCS)as cathode,the assembled CFS@C//PCS LIC full cells exhibit high energy/power density characteristics of 139.2 Wh/kg at 2500 W/kg.This work is expected to offer significant insights into structure modifications/devising toward natural minerals for advanced energy-storage systems.
基金supported by the Natural Science Foundation of China(52272188,U22A20227)the Natural Science Foundation of Beijing(2232025)+2 种基金the Natural Science Foundation of Chongqing(2022NSCQ-MSX2179)the Department of Science and Technology of Henan Province(Z20221343029)the Experimental Center of Advanced Materials in Beijing Institute of Technology。
文摘Sodium-ion batteries(SIBs)with advantages of abundant resource and low cost have emerged as promising candidates for the next-generation energy storage systems.However,safety issues existing in electrolytes,anodes,and cathodes bring about frequent accidents regarding battery fires and explosions and impede the development of high-performance SIBs.Therefore,safety analysis and high-safety battery design have become prerequisites for the development of advanced energy storage systems.The reported reviews that only focus on a specific issue are difficult to provide overall guidance for building high-safety SIBs.To overcome the limitation,this review summarizes the recent research progress from the perspective of key components of SIBs for the first time and evaluates the characteristics of various improvement strategies.By orderly analyzing the root causes of safety problems associated with different components in SIBs(including electrolytes,anodes,and cathodes),corresponding improvement strategies for each component were discussed systematically.In addition,some noteworthy points and perspectives including the chain reaction between security issues and the selection of improvement strategies tailored to different needs have also been proposed.In brief,this review is designed to deepen our understanding of the SIBs safety issues and provide guidance and assistance for designing high-safety SIBs.
基金the financial support from the National Natural Science Foundation of China(Grant Nos.51371065,51671070,51671067,51671071)the Opening Funding of AWJ-16-Z02 in the State Key Laboratory of Advanced Welding and Joining,China
文摘Mciro-arc oxidation（MAO）was used to coat porous films on the surface of a Zr-based bulk metallic glass sample.The compressive test results indicated that,compared with the as-cast sample,the MAO treated one exhibited higher deformation capacity,associated with multiple shear bands with higher density on the side surface and well-developed vein patterns with smaller size on the fractured surface.The pore in the MAOed film and the matrix/coating interface initiated the shear bands and impeded the rapid propagation of shear bands,thus favoring the enhanced plasticity of the MAO treated sample.The obtained results demonstrated that MAO can be considered as an effective method to finely tune the mechanical performance of monolithic bulk metallic glasses.
基金The 74nd Postdoctoral Science Foundation of China 2024M362720(L.W.)Regenerative Sports Medicine and Translational Youth Science and Technology Innovation Workroom(J.Z.)Technology Support Project of Science and Technology Commission of Shanghai Municipality 21S31908500(J.Z.).
文摘Degradable rotator cuff patches,followed over five years,have been observed to exhibit high re-tear rates exceeding 50%,which is attributed to the inability of degradable polymers alone to restore the post-rotator cuff tear(RCT)inflammatory niche.Herein,poly(ester-ferulic acid-urethane)urea(PEFUU)was developed,featuring prolonged anti-inflammatory functionality,achieved by the integration of ferulic acid(FA)into the polyurethane repeating units.PEFUU stably releases FA in vitro,reversing the inflammatory niche produced by M1 macrophages and restoring the directed differentiation of stem cells.Utilizing PEFUU,hierarchical composite nanofiber patch(HCNP)was fabricated,simulating the natural microstructure of the tendon-to-bone interface with an aligned-random alignment.The incorporation of enzymatic hydrolysate derived from decellularized Wharton jelly tissue into the random layer could further enhance cartilage regeneration at the tendon-to-bone interface.Via rat RCT repairing model,HCNP possessing prolonged anti-inflammatory properties uniquely facilitated physiological healing at the tendon-to-bone interface’s microstructure.The alignment of fibers was restored,and histologically,the characteristic tripartite distribution of collagen I-collagen II-collagen I was achieved.This study offers a universal approach to the functionalization of degradable polymers and provides a foundational reference for their future applications in promoting the in vivo regeneration of musculoskeletal tissues.
