For renewable energy-driven water electrolysis,developing low cost,highly active and durable electrocatalysts is essential.Here,we prepared a W-doped NiMoN microcolumn coated with a nitrogen doped carbon layer(W-NiMoN...For renewable energy-driven water electrolysis,developing low cost,highly active and durable electrocatalysts is essential.Here,we prepared a W-doped NiMoN microcolumn coated with a nitrogen doped carbon layer(W-NiMoN@NC)as an excellent non-precious electrocatalyst.This material displays excellent hydrogen evolution reaction(HER)activity with low overpotentials of 13 and 67 mV at 10 and 100 mA cm^(−2),outperforming commercial Pt/C.DFT calculations show that W doping optimizes the water dissociation and H^(*)adsorption processes,improving HER activity.Additionally,W doping coupled with an ultrathin NC coating enhances the intrinsic anti-oxidation ability of NiMoN.After 100 cycles of harsh fluctuating electrolysis,the incremental overpotential of W-NiMoN@NC is only 8 mV at 1000 mA cm^(−2),significantly less than that of undoped NiMoN@NC(56 mV).The excellent anti-oxidation ability of W-NiMoN@NC resulting from its high reserves of Ni0 was proved by XPS analysis after fluctuating electrolysis.This inside-out strategy endows W-NiMoN@NC with an exceptional feature of long-term durability under harsh fluctuating conditions and a promising potential for application in renewable energypowered electrolysis.展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2021YFB3301101)the Fundamental Research Funds for the Central Universities(No.JD2409 and BH202436)+2 种基金the National Natural Science Foundation of China(No.21506010)the Interdisciplinary Research Center for Chemical Process Safety(Grant No.XK2023-07)the Key Project of Dongying City-University Cooperation Fund(Grant No.H2022608).
文摘For renewable energy-driven water electrolysis,developing low cost,highly active and durable electrocatalysts is essential.Here,we prepared a W-doped NiMoN microcolumn coated with a nitrogen doped carbon layer(W-NiMoN@NC)as an excellent non-precious electrocatalyst.This material displays excellent hydrogen evolution reaction(HER)activity with low overpotentials of 13 and 67 mV at 10 and 100 mA cm^(−2),outperforming commercial Pt/C.DFT calculations show that W doping optimizes the water dissociation and H^(*)adsorption processes,improving HER activity.Additionally,W doping coupled with an ultrathin NC coating enhances the intrinsic anti-oxidation ability of NiMoN.After 100 cycles of harsh fluctuating electrolysis,the incremental overpotential of W-NiMoN@NC is only 8 mV at 1000 mA cm^(−2),significantly less than that of undoped NiMoN@NC(56 mV).The excellent anti-oxidation ability of W-NiMoN@NC resulting from its high reserves of Ni0 was proved by XPS analysis after fluctuating electrolysis.This inside-out strategy endows W-NiMoN@NC with an exceptional feature of long-term durability under harsh fluctuating conditions and a promising potential for application in renewable energypowered electrolysis.
