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Issue 46, 2018
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Spin state engineered ZnxCo3−xO4 as an efficient oxygen evolution electrocatalyst

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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 an efficient catalyst with a low overpotential for the OER in 0.1 M KOH solution. Substitution of Co2+ in the spinel oxide Co3O4 with Zn2+ creates a higher 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 the optimum amount of Co2+/Co3+ and high-spin Co3+ content showed a very low overpotential of ∼250 mV, at 10 mA cm−2, with a turnover frequency of ∼3 × 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.

Graphical abstract: Spin state engineered ZnxCo3−xO4 as an efficient oxygen evolution electrocatalyst

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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., 2018,20, 29452-29461

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    Spin state engineered ZnxCo3−xO4 as an efficient oxygen evolution electrocatalyst

    R. M. Ramsundar, V. K. Pillai and P. A. Joy, Phys. Chem. Chem. Phys., 2018, 20, 29452
    DOI: 10.1039/C8CP06641H

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