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Spin state engineered ZnxCo3-xO4 as efficient oxygen evolution electrocatalyst

Abstract

Oxygen evolution is the key step in the oxidation of water in electrolyzers and photoelectrochemical cells for the production of hydrogen. Developing a non-precious metal oxide catalyst with good electrocatalytic activity for the oxygen evolution reaction (OER) is very challenging. In this work, nanostructured ZnxCo3-xO4 has been shown as efficient catalysts with low overpotential for OER in 0.1 M KOH solution. Substitution of Co2+ in the spinel oxide Co3O4 by Zn2+ creates more number of high-spin Co3+, which is found to be directly correlated with the OER activity of ZnxCo3-xO4. Zn0.8Co2.2O4 (x = 0.8) with optimum amount of Co2+/Co3+ and high-spin Co3+ content showed a very low overpotential of ~250 mV, at 10 mA/cm2, with a turnover frequency of ~3 x 10-3 s-1 for the OER. The high Faradaic efficiency along with the stability of Zn0.8Co2.2O4 and electrocatalytic activity comparable with that of precious metal oxides indicate that this composition is a promising catalyst for water oxidation.

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Publication details

The article was received on 25 Oct 2018, accepted on 06 Nov 2018 and first published on 06 Nov 2018


Article type: Paper
DOI: 10.1039/C8CP06641H
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Spin state engineered ZnxCo3-xO4 as efficient oxygen evolution electrocatalyst

    R. M. Ramsundar, V. K. Pillai and P. A. Joy, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP06641H

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