Efficient and Stable Evolution of Oxygen Using Pulse-Electrodeposited Ir/Ni Oxide Catalyst in Fe-Spiked KOH Electrolyte
By Gong, Luo; Ren, Dan; Deng, Yilin; Yeo, Boon Siang
Published in ACS Applied Materials & Interfaces
2016
Abstract
Metal oxides have been extensively explored as catalysts for the electrochemical oxygen evolution reaction (OER). Here, we present an excellent OER catalytic system consisting of pulse-electrodeposited Ir/Ni oxides in Fe3+-spiked 1 M KOH. In pure 1 M KOH electrolyte, the optimized catalyst, which had an Ir:Ni atom ratio of 1:1.49, could catalyze 10 mA/cm2 of O2 production at a small overpotential (?) of 264 mV. Remarkably, we found that its OER performance could be significantly improved by adding 0.3 mM Fe3+ into the electrolyte. At an ? of just 343