Issue 21, 2021

Cobalt phosphide nanowires with adjustable iridium, realizing excellent bifunctional activity for acidic water splitting

Abstract

The exploration of highly active bifunctional electrocatalysts for acidic electrochemical water splitting has attracted wide attention due to their importance in polymer electrolyte membrane (PEM) electrolyzers. However, existing catalysts normally suffer from low catalytic efficiency under acidic conditions. Herein, we developed a series of Ir-doped CoP nanowires arrays on carbon cloth (Ir-CoP/CC) materials, realizing prominently improved bifunctional catalytic activity for overall water splitting in an acidic medium. The optimized Ir4-CoP/CC catalyst exhibits the smallest overpotential of 38 mV and 237 mV to reach 10 mA cm−2 for HER and OER, respectively. Through systematic experimental research, we find the best intrinsic activity belongs to Ir3-CoP/CC catalyst, which presents superior bifunctional performance with the most economical usage of Ir. As a result, the best acidic water splitting electrolyzer displays a very low voltage of 1.50 V at 10 mA cm−2. This work provides a novel strategy to develop highly active bifunctional catalysts for acidic electrochemical water splitting.

Graphical abstract: Cobalt phosphide nanowires with adjustable iridium, realizing excellent bifunctional activity for acidic water splitting

Supplementary files

Article information

Article type
Paper
Submitted
13 Mar 2021
Accepted
26 Apr 2021
First published
26 Apr 2021

Dalton Trans., 2021,50, 7364-7371

Cobalt phosphide nanowires with adjustable iridium, realizing excellent bifunctional activity for acidic water splitting

Y. Tong and P. Chen, Dalton Trans., 2021, 50, 7364 DOI: 10.1039/D1DT00839K

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