As a half-reaction to obtain high-efficiency and stable water-splitting,oxygen evolution reaction(OER)is a slow-kinetics process involving a four-electron(4e^-)transfer process and therefore requires catalysts to fast...As a half-reaction to obtain high-efficiency and stable water-splitting,oxygen evolution reaction(OER)is a slow-kinetics process involving a four-electron(4e^-)transfer process and therefore requires catalysts to fasten electron transfer.Here,we rationally optimized an interface material of ceria nanoparticles and nickel hydroxide by adsorbing ethylene glycol(EG-Ni(OH)2@CeO2),which produced ultrasmall nanosheets uniformly attached onto carbon cloth substrate.According to the characterization and density functional theory(DFT),the ethylene glycol-induced nickel–cerium interface had strong electron interaction,generating numerous of Ni^(3-δ)+active sites,reducing the energy reaction barrier,and promoting the electron-transport kinetics in the catalytic system.EG-Ni(OH)2@CeO2 showed excellent OER performance,with a low overpotential(335 m V)at 50 m A cm^-2 and a small Tafel slope(67.4 m V dec^-1).And the EG-Ni(OH)2@CeO2 also maintained stable for up to 60 h at 10,20,and 30 m A cm^-2.Overall,this research shows the significance of the interface engineering of metal materials based on organic-solvent adsorption to improve the electrocatalytic OER process.展开更多
基金financially supported by the National Natural Science Foundation of China(51762012 and 51862006)the Key Research and Development Project of Hainan Province(ZDYF2018106)the Research Unit of Island Emergency Medicine of Chinese Academy of Medical Sciences(2019RU013)。
文摘As a half-reaction to obtain high-efficiency and stable water-splitting,oxygen evolution reaction(OER)is a slow-kinetics process involving a four-electron(4e^-)transfer process and therefore requires catalysts to fasten electron transfer.Here,we rationally optimized an interface material of ceria nanoparticles and nickel hydroxide by adsorbing ethylene glycol(EG-Ni(OH)2@CeO2),which produced ultrasmall nanosheets uniformly attached onto carbon cloth substrate.According to the characterization and density functional theory(DFT),the ethylene glycol-induced nickel–cerium interface had strong electron interaction,generating numerous of Ni^(3-δ)+active sites,reducing the energy reaction barrier,and promoting the electron-transport kinetics in the catalytic system.EG-Ni(OH)2@CeO2 showed excellent OER performance,with a low overpotential(335 m V)at 50 m A cm^-2 and a small Tafel slope(67.4 m V dec^-1).And the EG-Ni(OH)2@CeO2 also maintained stable for up to 60 h at 10,20,and 30 m A cm^-2.Overall,this research shows the significance of the interface engineering of metal materials based on organic-solvent adsorption to improve the electrocatalytic OER process.
