ZnO‐Templated Selenized and Phosphorized Cobalt‐Nickel Oxide Microcubes as Rapid Alkaline Water Oxidation Electrocatalysts

Abstract

Oxygene lectrocatalysis is of remarkable significance for electrochemical energy storage and conversion technologies, togetherw ith fuel cells, metal-air batteries, and water splitting devices. Substituting noble metal-based electrocatalysts by decidedly effectivea nd low-cost metalbased oxygen electrocatalysts is imperative for the commercial applicationo ft hese technologies. Herein,anovel strategy is presentedt of abricate selenized and phosphorized porousc obalt-nickel oxide microcubesb yu sing as acrificial ZnO spherical template and the resulting microcubes are employed as an oxygenevolution reaction(OER) electrocata-lyst. Thes elenized samples manifest desirable and robust OER performance, with comparable overpotential at 10 mA cm À2 (312 mV) as RuO 2 (308 mV) and bettera ctivity when the current reaches 13.7 mA cm À2 .T he phosphorized samples exhibit core-shell structure with low-crystalline oxidesi nside amorphousp hosphides,w hiche nsures superior activity than RuO 2 with the same overpotential (at 10 mA cm À2 )y et lower Ta fel slope. Such as urface doping method possibly will provide inspiration for engineering electrocatalysts applied in water oxidation.[a] M.