An excellent organolead halide perovskite film is important for the good performance of perovskite solar cells(PSCs).However,defects in perovskite crystals can affect the photovoltaic properties and stability of solar...An excellent organolead halide perovskite film is important for the good performance of perovskite solar cells(PSCs).However,defects in perovskite crystals can affect the photovoltaic properties and stability of solar cells.To solve this problem,this study incorporated a complex of Cd S and Cd(SCN_(2)H_(4))_(2)Cl_(2)into the CH_(3)NH_(3)Pb I_(3)active layer.The effects of different doping concentrations of Cd S and Cd(SCN_(2)H_(4))_(2)Cl_(2)on the performance and stability of PSCs were analyzed.Results showed that doping appropriate incorporation concentrations of Cd S and Cd(SCN_(2)H_(4))_(2)Cl_(2)in CH_(3)NH_(3)Pb I_(3)can improve the performance of the prepared solar cells.In specific,Cd S and Cd(SCN_(2)H_(4))_(2)Cl_(2)can effectively passivate the defects in perovskite crystals,thereby suppressing the charge recombination in PSCs and promoting the charge extraction at the TiO_(2)/perovskite interface.Due to the reduction of perovskite crystal defects and the enhancement of compactness of the Cd S:Cd(SCN_(2)H4)_(2)Cl_(2):CH_(3)NH_(3)Pb I_(3)composite film,the stability of PSCs is significantly improved.展开更多
The sulphide capacity of CaO-SiO2-Al2O3-MgO-FetO slags was studied at 1773 K using gas-slag equilibrium techniques. Utilizing a Pt crucible, the slag was equilibrated with a mixture of gases, namely, CO, CO2, SO2 and ...The sulphide capacity of CaO-SiO2-Al2O3-MgO-FetO slags was studied at 1773 K using gas-slag equilibrium techniques. Utilizing a Pt crucible, the slag was equilibrated with a mixture of gases, namely, CO, CO2, SO2 and N2 to provide the partial pressure of oxygen and sulphur. It was shown that at fixed FetO and Al2O3 contents and a fixed { （%CaO）＋（%MgO）}/（%SIO2） ratio, the sulphide capacity decreases with increasing MgO content. At a constant （%CaO）/（%SiO2） ratio and constant MgO and Al2O3 contents, increasing the FetO content of the slags also results in an increase of the sulphide capacity. The rising basicity of （%CaO）/（%SiO2） from 1.0 to 1.4 at fixed MgO, FetO and Al2O3 contents significantly increases the sulphide capacity.展开更多
Nanocrystals of Rh, an important member of the noble metal catalyst family, have wide applications in heterogeneous catalytic reactions. Controlling the morphology of these noble metal nanocrystals has become an effec...Nanocrystals of Rh, an important member of the noble metal catalyst family, have wide applications in heterogeneous catalytic reactions. Controlling the morphology of these noble metal nanocrystals has become an effective strategy for improving their catalytic activity and durability. In this work, well-defined Rh nanodendrites with very thin triangular branches as subunits are synthesized using a facile diethylene glycol reduction method, assisted by polyethyleneimine as a complex-forming agent and surfactant. For the first time, the methanol oxidation reaction （MOR） on Rh nanocrystals with a well-defined morphology is investigated using various electrochemical techniques in an alkaline medium. Unexpectedly, the as-prepared Rh nanodendrites, with ultrathin nanosheet subunits, exhibit superior electrocatalytic activity and durability during the MOR in an alkaline medium, indicating that Rh nanocrystals with specific morphology may be highly promising alternatives to Pt electrocatalysts in the MOR in an alkaline medium.展开更多
Electrochemical water splitting(EWS)is a highly clean and efficient method for high-purity hydrogen production.Unfortunately,EWS suffers from the sluggish and complex oxygen evolution reaction(OER)kinetics at anode.At...Electrochemical water splitting(EWS)is a highly clean and efficient method for high-purity hydrogen production.Unfortunately,EWS suffers from the sluggish and complex oxygen evolution reaction(OER)kinetics at anode.At present,the efficient,stable,and low-cost non-precious metal based OER electrocatalyst is still a great and long-term challenge for the future industrial application of EWS technology.Herein,we develop a simple and fast approach for gram-scale synthesis of flower-like cobalt-based layered double hydroxides nanosheet aggregates by ultrasonic synthesis,which show outstanding electrocatalytic performance for the oxygen evolution reaction in alkaline media,such as preeminent stability,small overpotential of 300 mV at 10 mA·cm^−2 and small Tafel slope of 110 mV·dec^−1.展开更多
The triboelectric nanogenerator(TENG)offers a novel approach to harness mechanical energy continuously and sustainably.It has emerged as a leading technology for converting mechanical energy into electricity.The deman...The triboelectric nanogenerator(TENG)offers a novel approach to harness mechanical energy continuously and sustainably.It has emerged as a leading technology for converting mechanical energy into electricity.The demand for self-powered wearable microelectronics and energy generation in extreme conditions underscores the need for efficient high-temperature operatable TENGs(HTO-TENGs).However,the operating environment temperature not only affects the storage and dissipation of electrons during triboelectrification,leading to decreased output performance of TENG and instability at high temperatures,but also damage to the mechanical stability and effective defects in most tribomaterials,resulting in a further reduction in TENG’s effective output power.Moreover,the unstable material properties of the triboelectric layer at high temperatures also restrict the use of the TENG in harsh environments.Therefore,it is imperative to consider the structural durability and electrical output stability of TENG when applying it in challenging working environments.This review aims to bridge this gap by providing a comprehensive overview of the current state and research advancements in HTO-TENG for the first time.Finally,this review presents insights into future research prospects and proposes design strategies to facilitate the rapid development of the field.展开更多
A 3D nanostructured scaffold as the host for zinc enables effective inhibition of anodic dendrite growth.However,the increased electrode/electrolyte interface area provided by using 3D matrices exacerbates the passiva...A 3D nanostructured scaffold as the host for zinc enables effective inhibition of anodic dendrite growth.However,the increased electrode/electrolyte interface area provided by using 3D matrices exacerbates the passivation and localized corrosion of the Zn anode,ultimately bringing about the degradation of the electrochemical performance.Herein,a nanoscale coating of inorganic-organic hybrid(α-In_(2)Se_(3)-Nafion)onto a flexible carbon nanotubes(CNTs)framework(ISNF@CNTs)is designed as a Zn plating/stripping scaffold to ensure uniform Zn nucleation,thus achieving a dendrite-free and durable Zn anode.The intro-duced inorganic-organic interfacial layer is dense and sturdy,which hinders the direct exposure of deposited Zn to electrolytes and mitigates the side reactions.Meanwhile,the zincophilic nature of ISNF can largely reduce the nucleation energy barrier and promote the ion-diffusion transportation.Consequently,the ISNF@CNTs@Zn electrode exhibits a low-voltage hysteresis and a superior cycling life(over 1500 h),with dendrite-free Zn-plating behaviors in a typical symmetrical cell test.Additionally,the superior feature of ISNF@CNTs@Zn anode is further demonstrated by Zn-MnO_(2)cells in both coin and flexible quasi-solid-state configurations.This work puts forward an inspired remedy for advanced Zn-ion batteries.展开更多
In recent years,halide perovskite solar cells(HPSCs)have attracted a great atten-tion due to their superior photoelectric performance and the low-cost of processing their quality films.In order to commercialize HPSCs,...In recent years,halide perovskite solar cells(HPSCs)have attracted a great atten-tion due to their superior photoelectric performance and the low-cost of processing their quality films.In order to commercialize HPSCs,the researchers are focusing on developing high-performance HPSCs.Many strategies have been reported to increase the power conversion efficiency and the long-term stability of HPSCs over the past decade.Herein,we review the latest efforts and the chemical-physical principles for preparing high-efficiency and long-term stability HPSCs in particu-lar,concentrating on the perovskite materials,technologies for perovskite films,charge transport materials and ferroelectric effect to reduce the carrier loss,and photon management via plasmonic and upconversion effects.Finally,the key issues for future researches of HPSCs are also discussed with regard to the require-ments in practical application.展开更多
基金financially supported by the National Science Foundation for Young Scientists of China(No.61704048)the Program for Science&Technology Innovation Talents in Universities of Henan Province,China(No.19HASTIT049)+1 种基金the Key Research Project of Henan Provincial Higher Education,China(No.19A140007)the Natural Science Foundation for Young Scientists of Henan Province,China(No.202300410060)。
文摘An excellent organolead halide perovskite film is important for the good performance of perovskite solar cells(PSCs).However,defects in perovskite crystals can affect the photovoltaic properties and stability of solar cells.To solve this problem,this study incorporated a complex of Cd S and Cd(SCN_(2)H_(4))_(2)Cl_(2)into the CH_(3)NH_(3)Pb I_(3)active layer.The effects of different doping concentrations of Cd S and Cd(SCN_(2)H_(4))_(2)Cl_(2)on the performance and stability of PSCs were analyzed.Results showed that doping appropriate incorporation concentrations of Cd S and Cd(SCN_(2)H_(4))_(2)Cl_(2)in CH_(3)NH_(3)Pb I_(3)can improve the performance of the prepared solar cells.In specific,Cd S and Cd(SCN_(2)H_(4))_(2)Cl_(2)can effectively passivate the defects in perovskite crystals,thereby suppressing the charge recombination in PSCs and promoting the charge extraction at the TiO_(2)/perovskite interface.Due to the reduction of perovskite crystal defects and the enhancement of compactness of the Cd S:Cd(SCN_(2)H4)_(2)Cl_(2):CH_(3)NH_(3)Pb I_(3)composite film,the stability of PSCs is significantly improved.
基金This project was financially supported by the National Natural Science Foundation of China (No.50574036) and Natural Science Foun-dation of HeBei Province, China (No.502267).
文摘The sulphide capacity of CaO-SiO2-Al2O3-MgO-FetO slags was studied at 1773 K using gas-slag equilibrium techniques. Utilizing a Pt crucible, the slag was equilibrated with a mixture of gases, namely, CO, CO2, SO2 and N2 to provide the partial pressure of oxygen and sulphur. It was shown that at fixed FetO and Al2O3 contents and a fixed { （%CaO）＋（%MgO）}/（%SIO2） ratio, the sulphide capacity decreases with increasing MgO content. At a constant （%CaO）/（%SiO2） ratio and constant MgO and Al2O3 contents, increasing the FetO content of the slags also results in an increase of the sulphide capacity. The rising basicity of （%CaO）/（%SiO2） from 1.0 to 1.4 at fixed MgO, FetO and Al2O3 contents significantly increases the sulphide capacity.
基金This work was supported by National Natural Science Foundation of China （No. 21473111）, Natural Science Foundation of Shaanxi Province （No. 2015JM2043）,and Fundamental Research Funds for the Central Universities （Nos. GK201602002 and GK201503037）.
文摘Nanocrystals of Rh, an important member of the noble metal catalyst family, have wide applications in heterogeneous catalytic reactions. Controlling the morphology of these noble metal nanocrystals has become an effective strategy for improving their catalytic activity and durability. In this work, well-defined Rh nanodendrites with very thin triangular branches as subunits are synthesized using a facile diethylene glycol reduction method, assisted by polyethyleneimine as a complex-forming agent and surfactant. For the first time, the methanol oxidation reaction （MOR） on Rh nanocrystals with a well-defined morphology is investigated using various electrochemical techniques in an alkaline medium. Unexpectedly, the as-prepared Rh nanodendrites, with ultrathin nanosheet subunits, exhibit superior electrocatalytic activity and durability during the MOR in an alkaline medium, indicating that Rh nanocrystals with specific morphology may be highly promising alternatives to Pt electrocatalysts in the MOR in an alkaline medium.
基金sponsored by the Natural Science Basic Research Plan in Shaanxi Province of China(No.2018JM5093)the Fundamental Research Funds for the Central Universities(Nos.GK201702009 and GK201901002)111 Project(No.B14041).
文摘Electrochemical water splitting(EWS)is a highly clean and efficient method for high-purity hydrogen production.Unfortunately,EWS suffers from the sluggish and complex oxygen evolution reaction(OER)kinetics at anode.At present,the efficient,stable,and low-cost non-precious metal based OER electrocatalyst is still a great and long-term challenge for the future industrial application of EWS technology.Herein,we develop a simple and fast approach for gram-scale synthesis of flower-like cobalt-based layered double hydroxides nanosheet aggregates by ultrasonic synthesis,which show outstanding electrocatalytic performance for the oxygen evolution reaction in alkaline media,such as preeminent stability,small overpotential of 300 mV at 10 mA·cm^−2 and small Tafel slope of 110 mV·dec^−1.
基金supported by the National Natural Sci-ence Foundation of China(No.52003074,52125205,U20A20166,52192614,52003073,and 62174049)the Project funded by China Postdoctoral Science Foundation(No.2020M680097)+5 种基金the Postdoctoral Fellowship Program of CPSF(No.GZC20230681)the Natural Science Foundation of Henan Province(No.202300410058)the National Sci-ence Fund for Excellent Young Scholars of Henan Province(No.222300420033)National key R&D program of China(2021YFB3200302 and 2021YFB3200304),Natural Science Foundation of BeijingMunicipality(Z180011 and 2222088)Shenzhen Science and Technology Program(grant number KQTD20170810105439418)the Fundamental Research Funds for the Central Universities.
文摘The triboelectric nanogenerator(TENG)offers a novel approach to harness mechanical energy continuously and sustainably.It has emerged as a leading technology for converting mechanical energy into electricity.The demand for self-powered wearable microelectronics and energy generation in extreme conditions underscores the need for efficient high-temperature operatable TENGs(HTO-TENGs).However,the operating environment temperature not only affects the storage and dissipation of electrons during triboelectrification,leading to decreased output performance of TENG and instability at high temperatures,but also damage to the mechanical stability and effective defects in most tribomaterials,resulting in a further reduction in TENG’s effective output power.Moreover,the unstable material properties of the triboelectric layer at high temperatures also restrict the use of the TENG in harsh environments.Therefore,it is imperative to consider the structural durability and electrical output stability of TENG when applying it in challenging working environments.This review aims to bridge this gap by providing a comprehensive overview of the current state and research advancements in HTO-TENG for the first time.Finally,this review presents insights into future research prospects and proposes design strategies to facilitate the rapid development of the field.
基金Natural Science Foundation for Young Scientists of Henan Province,Grant/Award Number:202300410071Key Research Project of Henan Provincial Higher Education,Grant/Award Number:21A140007National Natural Science Foundation of China,Grant/Award Numbers:62174049,52003073,52102285。
文摘A 3D nanostructured scaffold as the host for zinc enables effective inhibition of anodic dendrite growth.However,the increased electrode/electrolyte interface area provided by using 3D matrices exacerbates the passivation and localized corrosion of the Zn anode,ultimately bringing about the degradation of the electrochemical performance.Herein,a nanoscale coating of inorganic-organic hybrid(α-In_(2)Se_(3)-Nafion)onto a flexible carbon nanotubes(CNTs)framework(ISNF@CNTs)is designed as a Zn plating/stripping scaffold to ensure uniform Zn nucleation,thus achieving a dendrite-free and durable Zn anode.The intro-duced inorganic-organic interfacial layer is dense and sturdy,which hinders the direct exposure of deposited Zn to electrolytes and mitigates the side reactions.Meanwhile,the zincophilic nature of ISNF can largely reduce the nucleation energy barrier and promote the ion-diffusion transportation.Consequently,the ISNF@CNTs@Zn electrode exhibits a low-voltage hysteresis and a superior cycling life(over 1500 h),with dendrite-free Zn-plating behaviors in a typical symmetrical cell test.Additionally,the superior feature of ISNF@CNTs@Zn anode is further demonstrated by Zn-MnO_(2)cells in both coin and flexible quasi-solid-state configurations.This work puts forward an inspired remedy for advanced Zn-ion batteries.
基金Natural Science Foundation for Young Scientists of Henan Province,Grant/Award Numbers:202300410071,202300410060Natural Science Foundation of China,Grant/Award Numbers:52002373,61704048,62174049+6 种基金Postdoctoral Science Foundation of Anhui Province,Grant/Award Numbers:2021B493,2021B491HFIPS President Foundation,Grant/Award Numbers:YZJJ2022QN27,YZJJZX202018Young Talents Program of Henan University,Collaborative Innovation Program of Hefei Science Center,CAS,Grant/Award Number:2020HSC-CIP004Key Research Project of Henan Provincial Higher Education,Grant/Award Number:19A140007Natural Science Foundation of Henan Province,Grant/Award Number:162300410021Seed Fund of Young Scientific Research Talents of Henan University,Grant/Award Number:CX0000A40540Program for Science&Technology Innovation Talents in Universities of Henan Province,Grant/Award Number:19HASTIT049。
文摘In recent years,halide perovskite solar cells(HPSCs)have attracted a great atten-tion due to their superior photoelectric performance and the low-cost of processing their quality films.In order to commercialize HPSCs,the researchers are focusing on developing high-performance HPSCs.Many strategies have been reported to increase the power conversion efficiency and the long-term stability of HPSCs over the past decade.Herein,we review the latest efforts and the chemical-physical principles for preparing high-efficiency and long-term stability HPSCs in particu-lar,concentrating on the perovskite materials,technologies for perovskite films,charge transport materials and ferroelectric effect to reduce the carrier loss,and photon management via plasmonic and upconversion effects.Finally,the key issues for future researches of HPSCs are also discussed with regard to the require-ments in practical application.
