Developing highly efficient,durable electrocatalysts based on cheap,non-precious metals for the hydro-gen evolution reaction(HER)is still the key issue in the field of hydrogen economy.Herein,we report Mo-doped ultraf...Developing highly efficient,durable electrocatalysts based on cheap,non-precious metals for the hydro-gen evolution reaction(HER)is still the key issue in the field of hydrogen economy.Herein,we report Mo-doped ultrafine VC nanoparticles confined in few-layer graphitic nanocarbon(Mo-VC@GC)by a facile one-step pyrolysis method.The as-prepared Mo-VC@GC exhibits enhanced electrocatalytic activity com-pared with the VC@GC counterpart,with a lower overpotential of 198 mV(VC@GC:324 mV)to achieve a current density of 10 mA cm^(−2),a smaller Tafel slope of 169 mV dec^(−1)(VC@GC:209 mV dec^(−1)),along with outstanding long-term durability for at least 80 h,and∼100%HER yield in 1 M KOH solution.The remarkable electrocatalytic performance of Mo-VC@GC can be attributed to the desirable electronic structures and crystallinity regulated by Mo-doping,the unique ultrafine VC nanostructures with abundant exposed active sites,and atomically thin graphitic nanocarbon with high conductivity as a support.展开更多
基金supported by the National Natural Science Foundation of China(No.21701107,51672165)the Natural Science Foundation of Shaanxi Province(2019JQ-018)+6 种基金the Xi’an Key Laboratory of Green Manufacture of Ceramic Materials Foundation(No.2019220214SYS017CG039)the Key Program for International S&T Cooperation Projects of Shaanxi Province(2020KW-038,2020GHJD-04)the Science and Technology Resource Sharing Platform of Shaanxi Province(2020PT-022)the Science and Technology Program of Xi’an,China(2020KJRC0009)the Scientific Research Program Funded by Shaanxi Provincial Education Department(No.20JY001)the Doctoral Scientific Research Start-up Foundation of Shaanxi University of Science and Technology(2016QNBT-07)the Platform Construction Fund for Imported Talent of Shaanxi University of Science and Technology(134080038).
文摘Developing highly efficient,durable electrocatalysts based on cheap,non-precious metals for the hydro-gen evolution reaction(HER)is still the key issue in the field of hydrogen economy.Herein,we report Mo-doped ultrafine VC nanoparticles confined in few-layer graphitic nanocarbon(Mo-VC@GC)by a facile one-step pyrolysis method.The as-prepared Mo-VC@GC exhibits enhanced electrocatalytic activity com-pared with the VC@GC counterpart,with a lower overpotential of 198 mV(VC@GC:324 mV)to achieve a current density of 10 mA cm^(−2),a smaller Tafel slope of 169 mV dec^(−1)(VC@GC:209 mV dec^(−1)),along with outstanding long-term durability for at least 80 h,and∼100%HER yield in 1 M KOH solution.The remarkable electrocatalytic performance of Mo-VC@GC can be attributed to the desirable electronic structures and crystallinity regulated by Mo-doping,the unique ultrafine VC nanostructures with abundant exposed active sites,and atomically thin graphitic nanocarbon with high conductivity as a support.
