Lithium-sulfur(Li-S)batteries hold the potential to revolutionize energy storage due to the high theoretical capacity and energy density.However,the commercialization process is seriously hindered by the rapid capacit...Lithium-sulfur(Li-S)batteries hold the potential to revolutionize energy storage due to the high theoretical capacity and energy density.However,the commercialization process is seriously hindered by the rapid capacity decay and low utilization of sulfur,caused by the inevitable slow dynamics and the“shuttle effect”.The incorporation of metal-based electrocatalysts into sulfur cathodes shows promise in promoting the conversion of lithium polysulfides(LiPSs),reducing the“shuttle effect”,and enhancing cell kinetics and cycle life.Among these,Fe-based materials,characterized by environmental friendliness,low cost,abundant reserves,and high activity,are extensively used in sulfur cathode modification.This article reviews the advancements of Fe-based materials in enhancing Li-S batteries in recent years.Starting from single/multi-component Fe-based metal compounds and single/bimetallic atoms,the influence of different Fe coordination environments on the conversion mechanism of LiPSs is analyzed.It is hoped that this review and the proposed prospects can further stimulate the development and application of the Fe element in Li-S batteries in the future.展开更多
A sea-urchin-like CuO/ZnO porous nanostructure is obtained via a simple solution method followed by a calcination process.There are abundant pores among the resulting nanowires due to the thermal decomposition of copp...A sea-urchin-like CuO/ZnO porous nanostructure is obtained via a simple solution method followed by a calcination process.There are abundant pores among the resulting nanowires due to the thermal decomposition of copper-zinc hydroxide carbonate.The specific surface area of the as-prepared CuO/ZnO sample is determined as 31.3 m^(2)·g^(-1).The gas-sensing performance of the sea-urchin-like CuO/ZnO sensor is studied by exposure to volatile organic compound(VOC)vapors.With contrast to a pure porous sea-urchin-like ZnO sensor,the sea-urchin-like CuO/ZnO sensor shows superior gas-sensing behavior for acetone,formaldehyde,methanol,toluene,isopropanol and ethanol.It exhibits a high response of 52.6-100 ppm acetone vapor,with short response/recovery time.This superior sensing behavior is mainly ascribed to the porous nanowireassembled structure with abundant p-n heterojunctions.展开更多
WO_(3)(H_(2)O)_(0.333)/CdS(WS)nanocomposites are obtained via a rapid microwave hydrothermal method,and they are served as visible light-driven photocatalysts for the H2 generation.By using Pt as the cocatalyst,the WS...WO_(3)(H_(2)O)_(0.333)/CdS(WS)nanocomposites are obtained via a rapid microwave hydrothermal method,and they are served as visible light-driven photocatalysts for the H2 generation.By using Pt as the cocatalyst,the WS nanocomposite with 70 wt.%CdS reaches the H2 evolution rate of 10.32 mmol$g-1$h-1,much quicker than those of WO_(3)(H_(2)O)_(0.333)and CdS.The cycling test reveals the good photocatalytic stability of the WS nanocomposite.The carrier transfer mechanism of WS nanocomposites can be explained by the Z-scheme mechanism.The existence of the Z-scheme heterojunction greatly helps to separate photogenerated carriers and thus improves the photocatalytic activity.The present work provides a rapid synthesis method for preparing Z-scheme heterojunction photocatalysts,and may be helpful for the green production of hydrogen.展开更多
Aurone derivatives were synthesized in good to high yields by PBu_(3)-catalyzed intramolecular 5-exo cyclization of 2-alkynoylphenols.The reaction proceeds in high regioselectivity without forming 6-endo cyclization p...Aurone derivatives were synthesized in good to high yields by PBu_(3)-catalyzed intramolecular 5-exo cyclization of 2-alkynoylphenols.The reaction proceeds in high regioselectivity without forming 6-endo cyclization products.展开更多
Unlike fossil fuels,hydrogen is a renewable and clean energy source.It is available in a large amount and spreads throughout the world.When reacting with oxygen,hydrogen releases energy to produce water as the only pr...Unlike fossil fuels,hydrogen is a renewable and clean energy source.It is available in a large amount and spreads throughout the world.When reacting with oxygen,hydrogen releases energy to produce water as the only product.Hence,hydrogen is a promising alternative to fossil fuels[1].Today,most of hydrogen is produced via the steam methane reforming process,in which hightemperature steam is used to produce hydrogen from a methane source.However,methane is non-renewable,and carbon dioxide is generated in the reforming process.展开更多
A silver-catalyzed,K_(2)S_(2)O_(8)-mediated protocol to access regioselective acylarylation of unactivated alkenes was developed.The reaction between N-allyl-indoles andα-oxocarboxylic acids proceeded smoothly and in...A silver-catalyzed,K_(2)S_(2)O_(8)-mediated protocol to access regioselective acylarylation of unactivated alkenes was developed.The reaction between N-allyl-indoles andα-oxocarboxylic acids proceeded smoothly and involved an acyl radical addition/C–H cyclization cascade.The protocol showed a broad substrate scope and good tolerance of functional groups.The reaction proceeded with both internal and terminal alkenes to furnish many functional pyrrolo[1,2-a]indoles bearing the ketone carbonyl group,and this feature also provides the potential to construct structurally complex N-containing heterocycles.展开更多
Zinc-based aqueous batteries(ZABs)have attracted wide interest and become a hot topic in the field of secondary batteries due to their low cost,high safety,and environmental friendliness.However,challenges pertaining ...Zinc-based aqueous batteries(ZABs)have attracted wide interest and become a hot topic in the field of secondary batteries due to their low cost,high safety,and environmental friendliness.However,challenges pertaining to zinc anodes,such as dendrites growth and side reactions,which are associated with the high activity of freedom water molecules in the aqueous electrolyte,significantly hinder the advancement of ZABs.In recent years,strategies aimed at regulating water molecular activity have been demonstrated to address the above issues effectively.Nevertheless,there is a lack of systematic summary regarding the electrolyte engineering and the functional mechanisms for stabilizing zinc anodes from the point of view of water molecular activity management.Hence,this review comprehensively introduces strategies for regulating water activity through the electrolyte engineering to achieve side reaction-suppressed ZABs,including the latest research on aqueous zinc-metal batteries,the origin of critical zinc-related problems,and the development of technological and electrolyte additives.Lastly,various strategies were summarized from different perspectives to improve the performance of zinc metal anodes.This work is expected to present the latest outline and inspire future innovation in electrolyte technologies.展开更多
CoP is a candidate lithium storage material for its high theoretical capacity. However, large volume variations during the cycling processes haunted its application. In this work, a four-step strategy was developed to...CoP is a candidate lithium storage material for its high theoretical capacity. However, large volume variations during the cycling processes haunted its application. In this work, a four-step strategy was developed to synthesize N-doped carbon nanotubes wrapping CoP nanoparticles （CoP@N-CNTs）. Integration of nanosized particles and hollow-doped CNTs render the as-prepared CoP@N-CNTs excellent cycling stability with a reversible charge capacity of 648 mA.h.g-1 at 0.2 C after 100 cycles. The present strategy has potential application in the synthesis of phosphide enwrapped in carbon nanotube composites which have potential application in lithium-ion storage and energy conversion.展开更多
NASlCON-type Na3V2（PO4）3 （NVP） with superior electrochemical perfor- mance has attracted enormous attention with the development of sodium ion batteries. The structural aggregation as well as poor conductivity of ...NASlCON-type Na3V2（PO4）3 （NVP） with superior electrochemical perfor- mance has attracted enormous attention with the development of sodium ion batteries. The structural aggregation as well as poor conductivity of NVP hinder its application in high rate perforamance cathode with long stablity. In this paper, Na3V2-xMox（PO4）3@C was successfully prepared through two steps method, including sol-gel and solid state thermal reduction. The optimal doping amount of Mo was defined by experiment. When x was 0.15, the Na3V1.85Mo0.15（PO4）3@C sample has the best cycle performance and rate performance. The discharge capacity of Na3V1.85Mo0.15（PO4）3@C could reach 117.26 mA.h.g-1 at 0.1 C. The discharge capacity retention was found to be 94.5% after 600 cycles at 5 C.展开更多
基金supported by the National Natural Science Foundation of China(Nos.52207227 and 52202244)Doctoral Research Initiation Foundation of Anhui Normal University(No.751973)+1 种基金the Natural Science Foundation of Jiangsu Province,China(No.BK20220540)the Research Foundation for Advanced Talents of Jiangsu University,China(No.22JDG010).
文摘Lithium-sulfur(Li-S)batteries hold the potential to revolutionize energy storage due to the high theoretical capacity and energy density.However,the commercialization process is seriously hindered by the rapid capacity decay and low utilization of sulfur,caused by the inevitable slow dynamics and the“shuttle effect”.The incorporation of metal-based electrocatalysts into sulfur cathodes shows promise in promoting the conversion of lithium polysulfides(LiPSs),reducing the“shuttle effect”,and enhancing cell kinetics and cycle life.Among these,Fe-based materials,characterized by environmental friendliness,low cost,abundant reserves,and high activity,are extensively used in sulfur cathode modification.This article reviews the advancements of Fe-based materials in enhancing Li-S batteries in recent years.Starting from single/multi-component Fe-based metal compounds and single/bimetallic atoms,the influence of different Fe coordination environments on the conversion mechanism of LiPSs is analyzed.It is hoped that this review and the proposed prospects can further stimulate the development and application of the Fe element in Li-S batteries in the future.
基金This study was funded by grant Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application(LFCCMCA-09)Anhui Laboratory of Clean Energy Materials and Chemistry for Sustainable Conversion of Natural Resources(LCECSC-01)Natural Science Research Project for Universities in Anhui Province(KJ2019A0480).
文摘A sea-urchin-like CuO/ZnO porous nanostructure is obtained via a simple solution method followed by a calcination process.There are abundant pores among the resulting nanowires due to the thermal decomposition of copper-zinc hydroxide carbonate.The specific surface area of the as-prepared CuO/ZnO sample is determined as 31.3 m^(2)·g^(-1).The gas-sensing performance of the sea-urchin-like CuO/ZnO sensor is studied by exposure to volatile organic compound(VOC)vapors.With contrast to a pure porous sea-urchin-like ZnO sensor,the sea-urchin-like CuO/ZnO sensor shows superior gas-sensing behavior for acetone,formaldehyde,methanol,toluene,isopropanol and ethanol.It exhibits a high response of 52.6-100 ppm acetone vapor,with short response/recovery time.This superior sensing behavior is mainly ascribed to the porous nanowireassembled structure with abundant p-n heterojunctions.
基金the National Natural Science Foundation of China(Grant No.21671007)was gratefully acknowledged.
文摘WO_(3)(H_(2)O)_(0.333)/CdS(WS)nanocomposites are obtained via a rapid microwave hydrothermal method,and they are served as visible light-driven photocatalysts for the H2 generation.By using Pt as the cocatalyst,the WS nanocomposite with 70 wt.%CdS reaches the H2 evolution rate of 10.32 mmol$g-1$h-1,much quicker than those of WO_(3)(H_(2)O)_(0.333)and CdS.The cycling test reveals the good photocatalytic stability of the WS nanocomposite.The carrier transfer mechanism of WS nanocomposites can be explained by the Z-scheme mechanism.The existence of the Z-scheme heterojunction greatly helps to separate photogenerated carriers and thus improves the photocatalytic activity.The present work provides a rapid synthesis method for preparing Z-scheme heterojunction photocatalysts,and may be helpful for the green production of hydrogen.
基金The authors are grateful to the financial support from the National Natural Science Foundation of China(No.21272004).
文摘Aurone derivatives were synthesized in good to high yields by PBu_(3)-catalyzed intramolecular 5-exo cyclization of 2-alkynoylphenols.The reaction proceeds in high regioselectivity without forming 6-endo cyclization products.
基金This research was supported by the Open Foundation of the Key Laboratory of Functional Molecular Solids,Ministry of Education(FMS201930)the National Natural Science Foundation of China(Grant No.21201008)+1 种基金the Natural Science Foundation of Anhui Province(1208085QB31)the Natural Science Research Projects of Colleges and Universities in Anhui Province(No.KJ2017A311).
文摘Unlike fossil fuels,hydrogen is a renewable and clean energy source.It is available in a large amount and spreads throughout the world.When reacting with oxygen,hydrogen releases energy to produce water as the only product.Hence,hydrogen is a promising alternative to fossil fuels[1].Today,most of hydrogen is produced via the steam methane reforming process,in which hightemperature steam is used to produce hydrogen from a methane source.However,methane is non-renewable,and carbon dioxide is generated in the reforming process.
基金the National Natural Science Foundation of China(21702237,21272004)the Natural Science Research Project for Anhui Universities,the Start-up Research Fund of Anhui Normal University and the Project for Students’Innovative Experiment of Anhui Normal University for their financial support.
文摘A silver-catalyzed,K_(2)S_(2)O_(8)-mediated protocol to access regioselective acylarylation of unactivated alkenes was developed.The reaction between N-allyl-indoles andα-oxocarboxylic acids proceeded smoothly and involved an acyl radical addition/C–H cyclization cascade.The protocol showed a broad substrate scope and good tolerance of functional groups.The reaction proceeded with both internal and terminal alkenes to furnish many functional pyrrolo[1,2-a]indoles bearing the ketone carbonyl group,and this feature also provides the potential to construct structurally complex N-containing heterocycles.
基金supported by the National Natural Science Foundation of China(52207227)the Doctoral Research Initiation Foundation of Anhui Normal University(751973)。
文摘Zinc-based aqueous batteries(ZABs)have attracted wide interest and become a hot topic in the field of secondary batteries due to their low cost,high safety,and environmental friendliness.However,challenges pertaining to zinc anodes,such as dendrites growth and side reactions,which are associated with the high activity of freedom water molecules in the aqueous electrolyte,significantly hinder the advancement of ZABs.In recent years,strategies aimed at regulating water molecular activity have been demonstrated to address the above issues effectively.Nevertheless,there is a lack of systematic summary regarding the electrolyte engineering and the functional mechanisms for stabilizing zinc anodes from the point of view of water molecular activity management.Hence,this review comprehensively introduces strategies for regulating water activity through the electrolyte engineering to achieve side reaction-suppressed ZABs,including the latest research on aqueous zinc-metal batteries,the origin of critical zinc-related problems,and the development of technological and electrolyte additives.Lastly,various strategies were summarized from different perspectives to improve the performance of zinc metal anodes.This work is expected to present the latest outline and inspire future innovation in electrolyte technologies.
基金The present work was financially supported from the National Natural Science Foundation of China （Grant Nos. 21671005 and 21171007）, the Anhui Provincial Natural Science Foundation for Distin- guished Youth （1808085J27）, the Programs for Science and Technology Development of Anhui Province （1501021019）, and the Recruitment Program for Leading Talent Team of Anhui Province.
文摘CoP is a candidate lithium storage material for its high theoretical capacity. However, large volume variations during the cycling processes haunted its application. In this work, a four-step strategy was developed to synthesize N-doped carbon nanotubes wrapping CoP nanoparticles （CoP@N-CNTs）. Integration of nanosized particles and hollow-doped CNTs render the as-prepared CoP@N-CNTs excellent cycling stability with a reversible charge capacity of 648 mA.h.g-1 at 0.2 C after 100 cycles. The present strategy has potential application in the synthesis of phosphide enwrapped in carbon nanotube composites which have potential application in lithium-ion storage and energy conversion.
基金Financially supports from the National Natural Science Foundation of China （Grant Nos. 21671005 and 21171007） and the Programs for Science and Technology Development of Anhui Province （1501021019） were acknowledged.
文摘NASlCON-type Na3V2（PO4）3 （NVP） with superior electrochemical perfor- mance has attracted enormous attention with the development of sodium ion batteries. The structural aggregation as well as poor conductivity of NVP hinder its application in high rate perforamance cathode with long stablity. In this paper, Na3V2-xMox（PO4）3@C was successfully prepared through two steps method, including sol-gel and solid state thermal reduction. The optimal doping amount of Mo was defined by experiment. When x was 0.15, the Na3V1.85Mo0.15（PO4）3@C sample has the best cycle performance and rate performance. The discharge capacity of Na3V1.85Mo0.15（PO4）3@C could reach 117.26 mA.h.g-1 at 0.1 C. The discharge capacity retention was found to be 94.5% after 600 cycles at 5 C.
