A Core-Shell Structured CoMoO4•nH2O@Co1-xFexOOH Nanocatalyst for Electrochemical Evolution of Oxygen

Published

June 10, 2020

Author(s)

Jiajun Wang, Hui Yin, Zhengjun Chen, Guoxuan Cao, Ning Xu, Hui Wu, Ping Wang

Abstract

Nickle-iron oxyhydroxide (Ni_1-xFe_{xOOH) is well recognized as the best-performing oxygen evolution reaction (OER) catalyst in alkaline electrolytes, however its analogue cobalt-iron oxyhydroxide (Co}d1-xFe_xOOH) 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 Co_1-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 Co_1-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.

Citation

Electrochimica Acta

Volume

345

Pub Type

Journals

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Keywords

Electrochemical splitting of water, oxygen evolution reaction

Citation

Wang, J. , Yin, H. , Chen, Z. , Cao, G. , Xu, N. , Wu, H. and Wang, P. (2020), A Core-Shell Structured CoMoO₄&#8226nH₂O@Co_1-xFe_xOOH Nanocatalyst for Electrochemical Evolution of Oxygen, Electrochimica Acta, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=929389 (Accessed December 8, 2024)