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Dealloying-directed synthesis of efficient mesoporous CoFe-based catalysts towards oxygen evolution reaction and overall water splitting

Abstract

It is a great challenge to design highly active, stable and low-cost catalysts for electrochemically splitting water to realize the clean energy generation and renewable energy storage. Herein, a facile one-step dealloying strategy was proposed to synthesize mesoporous CoFe-based oxides and layered double hydroxides (LDHs). Benefitting from the fast mass transfer and more active sites caused by the open mesoporous structure, the CoFe-based materials exhibit excellent electrocatalytic activities and stability towards oxygen evolution reaction (OER) in an alkaline electrolyte (1 M KOH). The CoFe-LDH catalyst only needs an overpotential of 0.286 V to achieve 10 mA cm-2, and a small Tafel slope of 45 mV dec-1 for OER. Moreover, an alkaline electrolyzer was constructed with the CoFe-LDH as both the anode and cathode. The electrolyzer delivers a current density of 10 mA cm-2 at a voltage of 1.69 V toward overall water splitting in the 1 M KOH solution.

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Publication details

The article was accepted on 26 Sep 2017 and first published on 29 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR06254K
Citation: Nanoscale, 2017, Accepted Manuscript
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    Dealloying-directed synthesis of efficient mesoporous CoFe-based catalysts towards oxygen evolution reaction and overall water splitting

    L. Han, C. Dong, C. Zhang, Y. Gao, J. Zhang, H. Gao, Y. Wang and Z. Zhang, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06254K

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