Hierarchical CoS2/Ni3S2/CoNiOx nanorods with favorable stability at 1 A cm−2 for electrocatalytic water oxidation

Abstract

Herein, we have reported an easily synthesized CoS₂/Ni₃S₂/CoNiO_x water oxidation catalyst with excellent catalytic activity and superior durability. The as-prepared catalyst required overpotential (η) as low as 256 mV to exhibit a current density of 10 mA cm⁻² in 1.0 M KOH. Remarkably, it sustained a current density of 1 A cm⁻² for one week in 30% KOH solution with only 25 mV increment of η. Thus, it is a hopeful candidate as a highly-effective water oxidation electrode in practical applications.