The anodic oxygen evolution reaction(OER)hinders the development of hydrogen production by electrolysis of water due to its slow reaction kinetics.Nickel in its high-valent state has shown promising OER activity,which...The anodic oxygen evolution reaction(OER)hinders the development of hydrogen production by electrolysis of water due to its slow reaction kinetics.Nickel in its high-valent state has shown promising OER activity,which is,however,not preferred at relatively low overpotentials.To overcome this issue,we developed a sandwiched Ni(OH)_(2)/Cu/NF structure by coating a layer of Cu on the Ni foam and then depositing Ni(OH)_(2) onto the Cu surface.Systematic characterization indicated that the Cu layer enhanced the conversion of Ni(OH)_(2) into high-valence state Ni^(3+)species(i.e.,NiOOH)during the OER,resulting in excellent OER performance with a current density of 50 mA cm^(−2) for 25 hours at an overpotential of 250 mV.This work offers a promising approach to use Cu to promote the OER performance of Ni-based catalysts.展开更多
文摘The anodic oxygen evolution reaction(OER)hinders the development of hydrogen production by electrolysis of water due to its slow reaction kinetics.Nickel in its high-valent state has shown promising OER activity,which is,however,not preferred at relatively low overpotentials.To overcome this issue,we developed a sandwiched Ni(OH)_(2)/Cu/NF structure by coating a layer of Cu on the Ni foam and then depositing Ni(OH)_(2) onto the Cu surface.Systematic characterization indicated that the Cu layer enhanced the conversion of Ni(OH)_(2) into high-valence state Ni^(3+)species(i.e.,NiOOH)during the OER,resulting in excellent OER performance with a current density of 50 mA cm^(−2) for 25 hours at an overpotential of 250 mV.This work offers a promising approach to use Cu to promote the OER performance of Ni-based catalysts.
