Water electrolysis using renewable electricity is a promising strategy for high-purity hydrogen production.To realize the practical application of water electrolysis,an electrocatalyst with high redox properties and l...Water electrolysis using renewable electricity is a promising strategy for high-purity hydrogen production.To realize the practical application of water electrolysis,an electrocatalyst with high redox properties and low cost is essential for enhancing the sluggish oxygen evolution reaction.Herein,we fabricated Fe-doped nickel oxalate(Fe-NiC_(2)O_(4))directly grown on nickel(Ni)foam as an efficient electrocatalyst for the alkaline oxygen evolution reaction using a facile one-step hydrothermal method.Fe-NiC_(2)O_(4) served as a precursor for obtaining highly active Fe-doped Ni oxyhydroxide(Fe-NiOOH)via in situ electrochemical oxidation.Consequently,0.75Fe-NiOOH was demonstrated to be the optimal electrocatalyst,exhibiting outstanding oxygen evolution reaction activity with a low overpotential of 220 mV at a current density of 100 mA cm^(-2) and a Tafel slope of 20.5 mV dec^(-1).Furthermore,Fe-NiOOH maintained its oxygen evolution reaction activity without performance decay during long-term electrochemical measurements,owing to the phase transformation from nickel oxyhydroxide(NiOOH)toγ-NiOOH(gamma nickel oxyhydroxide).These performances significantly surpass those of recently reported transition-metal-based electrocatalysts.展开更多
基金supported by the Korea Institute of Energy Technology Evaluation and Planning(KETEP)(No.20213030040590)the Korea Institute for Advancement of Technology(KIAT)and the Ministry of Trade,Industry&Energy(MOTIE),Republic of Korea(No.P0022130)Korea Basic Science Institute(National Research Facilities and Equipment Center)grant funded by the Ministry of Education(2021R1A6C101A404)。
文摘Water electrolysis using renewable electricity is a promising strategy for high-purity hydrogen production.To realize the practical application of water electrolysis,an electrocatalyst with high redox properties and low cost is essential for enhancing the sluggish oxygen evolution reaction.Herein,we fabricated Fe-doped nickel oxalate(Fe-NiC_(2)O_(4))directly grown on nickel(Ni)foam as an efficient electrocatalyst for the alkaline oxygen evolution reaction using a facile one-step hydrothermal method.Fe-NiC_(2)O_(4) served as a precursor for obtaining highly active Fe-doped Ni oxyhydroxide(Fe-NiOOH)via in situ electrochemical oxidation.Consequently,0.75Fe-NiOOH was demonstrated to be the optimal electrocatalyst,exhibiting outstanding oxygen evolution reaction activity with a low overpotential of 220 mV at a current density of 100 mA cm^(-2) and a Tafel slope of 20.5 mV dec^(-1).Furthermore,Fe-NiOOH maintained its oxygen evolution reaction activity without performance decay during long-term electrochemical measurements,owing to the phase transformation from nickel oxyhydroxide(NiOOH)toγ-NiOOH(gamma nickel oxyhydroxide).These performances significantly surpass those of recently reported transition-metal-based electrocatalysts.
