Journal
ELECTROCHIMICA ACTA
Volume 345, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136125
Keywords
Water splitting; Oxygen evolution reaction; Electrocatalyst; Co-Fe oxyhydroxide; Core-shell structure
Categories
Funding
- National Natural Science Foundation of China [51671087]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [51621001]
- National Key R&D Program of China [2018YFB1502104]
- Foundation for Research Groups of the Natural Science Foundation of Guangdong Province [2016A030312011]
- Special Support Plan for National 10000-Talents Program
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Nickel-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 (Co1-xFexOOH) is surprisingly less explored despite their structural similarity. Inspired by our recent study on high-performance HER catalyst using the nanostructured CoMoO4 center dot nH(2)O precursor, herein, we report a facile synthesis of Co1-xFexOOH 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-xFexOOH layer over the surface of crystalline CoMoO4 center dot nH(2)O 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 center dot nH(2)O precursor as the cathode, 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. (c) 2020 Elsevier Ltd. All rights reserved.
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