Synchronized redox pairs in metal oxide/hydroxide chemical analogues for an efficient oxygen evolution reaction

Abstract

A two-step electrodeposition of CoMn₂O₄ and its chemical analogue CoMn(OH)_x directly over Ni-foam yields an excellent water oxidation overpotential of 260 mA cm⁻² with a Tafel slope of 29 mV dec⁻¹ and a four-fold increase in turnover frequency. The enhanced efficacy of the composite catalyst is realized through synchronized redox pairs and superior carrier transport.