Electrocatalytic hydrogen evolution reaction(HER)is a highly potential strategy to massively produce green hydrogen fuels.However,the employment of costly Pt-based electrocatalyst in the cathode of electrolyzer greatl...Electrocatalytic hydrogen evolution reaction(HER)is a highly potential strategy to massively produce green hydrogen fuels.However,the employment of costly Pt-based electrocatalyst in the cathode of electrolyzer greatly hampers the development of hydrogen economy.Ruthenium phosphide catalysts have recently drawn wide attention due to the Pt-like activity but relatively lower cost.Herein,a facile strategy was proposed for the controlled preparation of the ultrasmall RuP_(2) nanoparticles on N,P-codoped carbon from common precursors of Ru(Ⅱ)complex and phytic acid.By taking advantage of simple mixing and pyrolysis,the as-synthesized RuP_(2) nanoparticles were uniformly embedded onto the N,P-codoped carbon nanosheet.The composite catalyst shows better activity than Pt/C for alkaline HER and comparable activity for acidic and neutral HER.The superior activity can be ascribed to the ultrasmall-size and efficient RuP_(2) together with good mass and charge transfer ability assured by N,P-codoped carbon support.The advantages including low-cost and simple synthesis in this work present an encouraging substitute to replace commercial Pt/C for hydrogen-related practical applications.展开更多
Due to high theoretical specific capacity and excellent thermal stability,transition metal phosphides(TMPs)have emerged as highly promising candidates of anode materials for advancing lithium-ion batteries.However,it ...Due to high theoretical specific capacity and excellent thermal stability,transition metal phosphides(TMPs)have emerged as highly promising candidates of anode materials for advancing lithium-ion batteries.However,it remains confronted with significant challenges,including large volume expansion,low specific surface area and limited electron conductivity,which hinder their practical application in the field of energy storage.Herein,nitrogen,phosphoric-codoped carbon nanosheets decorated with cobalt phosphide nanoparticles(CoP/N,P-C)are synthesized through a simple and environment-friendly synthesis method demonstrating their potential as anode materials for lithium-ion batteries.The element-doped carbon matrix can enhance electrical conductivity,accelerate ion transport,improve the active sites,and buffer the volume expansion of CoP nanoparticles,collectively leading to significantly improved electrochemical performance.The prepared CoP/N,P-C electrodes present outstanding electrochemical performance,delivering a discharge specific capacity of 920 mAh g^(-1)after 100 cycles at 0.1 A g^(-1)and 686mAh g^(-1)after 3,000 cycles even at 2.0 A g^(-1).The quantitative kinetic analysis result reveals that pseudo-capacitance dominates total capacity behavior(70.6%at 0.5 mV s-1).Furthermore,the galvanostatic intermittent titration technique(GITT)is applied to prove the super-fast diffusion coefficient of the electrodes.This work provides a simplified and environmentally friendly method for effective modification of the comprehensive properties of transition metal phosphates.展开更多
Lithium-ion hybrid capacitors(LIHCs)have drawn extensive attention in fleld of energy storage.However,the absence of appropriate electrode materials with rapid kinetics restricted the overall performance of the capaci...Lithium-ion hybrid capacitors(LIHCs)have drawn extensive attention in fleld of energy storage.However,the absence of appropriate electrode materials with rapid kinetics restricted the overall performance of the capacitors.Herein,hierarchical N,P-codoped hollow car-bon nanospheres coupling with WS_(2) nanosheets(N,P-codoped HCNS/WS_(2)NSs)were fabricated for boosting lithium storage materials.Specially,the WS_(2) nanosheets with several layers embedded in the N,P-codoped hollow carbon nanospheres could not only enhance the conduc-tivity of composites,but also provide abundant channels for the rapid transfer of ions.As a result,as-prepared N,P-codoped HCNS/WS_(2) NSs demonstrated superior rate performance and long-term cycling stability.The reversible discharge capacity of 725.2 mAh·g^(-1) could be preserved after 1000 cycles at a current density of 1.0 A·g^(-1).Fur-thermore,LIHCs devices were assembled by using N,P-codoped HCNS/WS_(2) NSs and activated carbon(AC)as the cathode and anode,which exhibited high energy density of 166.7 Wh·kg^(-1) and power density of 5312.4 W·kg^(-1).Last but not least,the capacity almost had no obvious deterioration after 6000 cycles at a high current density of 10.0 A·g^(-1).展开更多
Hierarchical porous carbon co-doped with heterogeneous atoms has attracted much attention thanks to sizable internal void space accommodating electrolyte,high-density microporous structure physically con-fining polysu...Hierarchical porous carbon co-doped with heterogeneous atoms has attracted much attention thanks to sizable internal void space accommodating electrolyte,high-density microporous structure physically con-fining polysulfides(LPS),and heterogeneous atoms serving as active sites to capture LPS.However,solely relying on carbon material defects to capture LPS proves ineffective.Hence,metal compounds must be introduced to chemisorb LPS.Herein,cobalt ions are in-situ grown on the polydopamine layer coated on the surface of biomass-derived S,N,P co-doped hierarchical porous carbon(SNP-PC).Then a layer of nitrogen-doped porous carbon(MPC)dotted with CoSe nanoparticles is acquired by selenizing.Thus,a strong-polar/weak-polar composite material of SNP-PC studded with CoSe nanoparticles is obtained(SNP-PC@MPC@CoSe).Button cells assembled with SNP-PC@MPC@CoSe-modified separator enable superb long-cycle stability and satisfactory rate performance.An excellent rate capacity of 796 mAh g^(−1)at a high current rate of 4 C with an ultra-low capacity fading of 0.06%over 700 cycles can be acquired.More impressively,even in a harsh test condition of 5.65 mg cm^(−2)sulfur loading and 4μL mg^(−1)ratio of electrolyte to active materials,the battery can still display a specific capacity of 980 mAh g^(−1)(area capacity of∼5.54 mAh cm^(−2))at 0.1 C.This work provides a promising route toward high-performance Li-S batteries.展开更多
基金financially supported by the National Natural Science Foundation of China(No.21601078)the Natural Science Foundation of Shandong Province(Nos.ZR2016BQ21 and ZR2019MB064)+2 种基金Development Project of Youth Innovation Team in Shandong Colleges and Universities(No.2019KJC031)Doctoral Fund of Shandong Province(No.K19LB1201)Doctoral Program of Liaocheng University(No.318051608)。
文摘Electrocatalytic hydrogen evolution reaction(HER)is a highly potential strategy to massively produce green hydrogen fuels.However,the employment of costly Pt-based electrocatalyst in the cathode of electrolyzer greatly hampers the development of hydrogen economy.Ruthenium phosphide catalysts have recently drawn wide attention due to the Pt-like activity but relatively lower cost.Herein,a facile strategy was proposed for the controlled preparation of the ultrasmall RuP_(2) nanoparticles on N,P-codoped carbon from common precursors of Ru(Ⅱ)complex and phytic acid.By taking advantage of simple mixing and pyrolysis,the as-synthesized RuP_(2) nanoparticles were uniformly embedded onto the N,P-codoped carbon nanosheet.The composite catalyst shows better activity than Pt/C for alkaline HER and comparable activity for acidic and neutral HER.The superior activity can be ascribed to the ultrasmall-size and efficient RuP_(2) together with good mass and charge transfer ability assured by N,P-codoped carbon support.The advantages including low-cost and simple synthesis in this work present an encouraging substitute to replace commercial Pt/C for hydrogen-related practical applications.
基金financially supported by the National Natural Science Foundation of China(Nos.52207249 and 52472131)the Excellent Youth Innovation Team Project for Higher Education Institutions of Shandong Province(No.2023KJ238)+2 种基金the Major basic research project of Natural Science Foundation of Shandong Province(Nos.ZR2023ZD12 and ZR2023ZD13)Yantai Basic Research Project(No.2022JCYJ04)the Science Fund of Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai(No.AMGM2024F27)
文摘Due to high theoretical specific capacity and excellent thermal stability,transition metal phosphides(TMPs)have emerged as highly promising candidates of anode materials for advancing lithium-ion batteries.However,it remains confronted with significant challenges,including large volume expansion,low specific surface area and limited electron conductivity,which hinder their practical application in the field of energy storage.Herein,nitrogen,phosphoric-codoped carbon nanosheets decorated with cobalt phosphide nanoparticles(CoP/N,P-C)are synthesized through a simple and environment-friendly synthesis method demonstrating their potential as anode materials for lithium-ion batteries.The element-doped carbon matrix can enhance electrical conductivity,accelerate ion transport,improve the active sites,and buffer the volume expansion of CoP nanoparticles,collectively leading to significantly improved electrochemical performance.The prepared CoP/N,P-C electrodes present outstanding electrochemical performance,delivering a discharge specific capacity of 920 mAh g^(-1)after 100 cycles at 0.1 A g^(-1)and 686mAh g^(-1)after 3,000 cycles even at 2.0 A g^(-1).The quantitative kinetic analysis result reveals that pseudo-capacitance dominates total capacity behavior(70.6%at 0.5 mV s-1).Furthermore,the galvanostatic intermittent titration technique(GITT)is applied to prove the super-fast diffusion coefficient of the electrodes.This work provides a simplified and environmentally friendly method for effective modification of the comprehensive properties of transition metal phosphates.
基金the National Natural Science Foundation of China(Nos.51902266 and 22002003)the Innovation Foundation for Doctor Dissertation of Northwestern Poly technical University(No.CX2021009)+1 种基金the Key Research and Development Projects of Shaanxi Province(No.2020GXLH-Z-032)the Research Fund of the State Key Laboratory of Solidification Processing(NPU),China(No.G8QT0461G),and the Research Fund of the State Key Laboratory of Solidification Processing(NPU),China(No.SKLSP202004)。
文摘Lithium-ion hybrid capacitors(LIHCs)have drawn extensive attention in fleld of energy storage.However,the absence of appropriate electrode materials with rapid kinetics restricted the overall performance of the capacitors.Herein,hierarchical N,P-codoped hollow car-bon nanospheres coupling with WS_(2) nanosheets(N,P-codoped HCNS/WS_(2)NSs)were fabricated for boosting lithium storage materials.Specially,the WS_(2) nanosheets with several layers embedded in the N,P-codoped hollow carbon nanospheres could not only enhance the conduc-tivity of composites,but also provide abundant channels for the rapid transfer of ions.As a result,as-prepared N,P-codoped HCNS/WS_(2) NSs demonstrated superior rate performance and long-term cycling stability.The reversible discharge capacity of 725.2 mAh·g^(-1) could be preserved after 1000 cycles at a current density of 1.0 A·g^(-1).Fur-thermore,LIHCs devices were assembled by using N,P-codoped HCNS/WS_(2) NSs and activated carbon(AC)as the cathode and anode,which exhibited high energy density of 166.7 Wh·kg^(-1) and power density of 5312.4 W·kg^(-1).Last but not least,the capacity almost had no obvious deterioration after 6000 cycles at a high current density of 10.0 A·g^(-1).
基金supported by the National Natural Science Foundation of China(No.52003110)the Natural Science Foundation of Jiangxi Province(Nos.20202ACB202002,20202ACB214002).
文摘Hierarchical porous carbon co-doped with heterogeneous atoms has attracted much attention thanks to sizable internal void space accommodating electrolyte,high-density microporous structure physically con-fining polysulfides(LPS),and heterogeneous atoms serving as active sites to capture LPS.However,solely relying on carbon material defects to capture LPS proves ineffective.Hence,metal compounds must be introduced to chemisorb LPS.Herein,cobalt ions are in-situ grown on the polydopamine layer coated on the surface of biomass-derived S,N,P co-doped hierarchical porous carbon(SNP-PC).Then a layer of nitrogen-doped porous carbon(MPC)dotted with CoSe nanoparticles is acquired by selenizing.Thus,a strong-polar/weak-polar composite material of SNP-PC studded with CoSe nanoparticles is obtained(SNP-PC@MPC@CoSe).Button cells assembled with SNP-PC@MPC@CoSe-modified separator enable superb long-cycle stability and satisfactory rate performance.An excellent rate capacity of 796 mAh g^(−1)at a high current rate of 4 C with an ultra-low capacity fading of 0.06%over 700 cycles can be acquired.More impressively,even in a harsh test condition of 5.65 mg cm^(−2)sulfur loading and 4μL mg^(−1)ratio of electrolyte to active materials,the battery can still display a specific capacity of 980 mAh g^(−1)(area capacity of∼5.54 mAh cm^(−2))at 0.1 C.This work provides a promising route toward high-performance Li-S batteries.
