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Issue 10, 2017
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A facile corrosion approach to the synthesis of highly active CoOx water oxidation catalysts

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Abstract

Ultra-small rock salt cobalt monoxide (CoO) nanoparticles were synthesized and subjected to partial oxidation (‘corrosion’) with ceric ammonium nitrate (CAN) to form mixed-valence CoOx (1 < x < 2) water oxidation catalysts. Spectroscopic, microscopic and analytical methods evidenced a structural reformation of cubic CoO to active CoOx with a spinel structure. The superior water oxidation activity of CoOx has been established in electrochemical water oxidation under alkaline conditions. Electrochemical water oxidation with CoOx was recorded at a considerably low overpotential of merely 325 mV at a current density of 10 mA cm−2 in comparison to 370 mV for CoO. Transformation of both octahedral CoII and CoIII sites into amorphous Co(OH)2–CoOOH is the key to high electrochemical activity while the presence of a higher amount of octahedral CoIII sites in CoOx is imperative for an efficient oxygen evolution process.

Graphical abstract: A facile corrosion approach to the synthesis of highly active CoOx water oxidation catalysts

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Publication details

The article was received on 11 Dec 2016, accepted on 09 Feb 2017 and first published on 09 Feb 2017


Article type: Paper
DOI: 10.1039/C6TA10650A
Citation: J. Mater. Chem. A, 2017,5, 5171-5177
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    A facile corrosion approach to the synthesis of highly active CoOx water oxidation catalysts

    A. Indra, P. W. Menezes, C. Das, C. Göbel, M. Tallarida, D. Schmeiβer and M. Driess, J. Mater. Chem. A, 2017, 5, 5171
    DOI: 10.1039/C6TA10650A

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