A Core-Shell Structured CoMoO4•nH2O@Co1-xFexOOH Nanocatalyst for Electrochemical Evolution of Oxygen
Jiajun Wang, Hui Yin, Zhengjun Chen, Guoxuan Cao, Ning Xu, Hui Wu, Ping Wang
Nickle-iron oxyhydroxide (Ni1-xFexOOH) is well recognized as the best-performing oxygen evolution reaction (OER) catalyst in alkaline electrolytes, however its analogue cobalt-iron oxyhydroxide (Cod1-xFexOOH) is surprisingly less explored despite their structural similiarity. Inspried by our recent study on high- performance HER catalyst using the nanostructured CoMoO4 nH2O precursor, herein, we report a facile synthesis of Co1-xFedx^OOH catalyst derived from the same precursor and its excellent electrocatalytic properties towards the OER in alkaline electrolytes. A core-shell structured nanocatalyst consisting of disordered Co1-xFedx^OOH layer over the surface of crystalline CoMoO4 nH2O nanosheets was synthesized using a simple hydrothermal method followed by anodic electrooxidation. Thus-prepared catalyst exhibited extraordinarily high and stable activity towards the OER in alkaline electrolyte, which outperformed most Co-based OER catalysts. Combined with the HER catalyst derived from the same CoMoO4 nH2O precursor as the cataode, we further developed and tested a simple water-splitting cell, which significantly surpasses the benchmarking IrO2-Pt/C couple (1.63 V) and requires a voltage of only 1.517 V to afford 10 mA cm-2^ in 1.0 M KOH solution. Density functional theory calculations were conducted to gain insight into the Fe-doping induced improvement of OER activity.
, Yin, H.
, Chen, Z.
, Cao, G.
, Xu, N.
, Wu, H.
and Wang, P.
A Core-Shell Structured CoMoO<sub>4</sub>•nH<sub>2</sub>O@Co<sub>1-x</sub>Fe<sub>x</sub>OOH Nanocatalyst for Electrochemical Evolution of Oxygen, Electrochimica Acta, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=929389
(Accessed December 10, 2023)