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Anion-exchange synthesis of a nanoporous crystalline CoB2O4 nanowire array for high-performance water oxidation electrocatalysis in borate solution

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Abstract

Developing nanoporous nanoarray electrocatalysts for efficient water oxidation in environmentally benign media is highly desired but still remains a key challenge. In this communication, we report the fabrication of a nanoporous crystalline CoB2O4 nanowire array on Ti mesh (CoB2O4/TM) from a Co(OH)F nanowire array on Ti mesh (Co(OH)F/TM) via an anion-exchange reaction. As a three dimensional (3D) catalyst electrode for water oxidation, CoB2O4/TM exhibits superior catalytic activity and needs an overpotential of only 446 mV to drive a geometrical catalytic current density of 10 mA cm−2 in 0.1 M potassium borate (pH = 9.2). Notably, this catalyst also shows strong long-term electrochemical durability with high turnover frequency values of 0.19 and 0.81 mol O2 per s at overpotentials of 400 and 500 mV, respectively.

Graphical abstract: Anion-exchange synthesis of a nanoporous crystalline CoB2O4 nanowire array for high-performance water oxidation electrocatalysis in borate solution

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Publication details

The article was received on 16 Jun 2017, accepted on 04 Aug 2017 and first published on 04 Aug 2017


Article type: Communication
DOI: 10.1039/C7NR04344A
Citation: Nanoscale, 2017, Advance Article
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    Anion-exchange synthesis of a nanoporous crystalline CoB2O4 nanowire array for high-performance water oxidation electrocatalysis in borate solution

    G. Zhu, L. Yang, R. Zhang, F. Qu, Z. Liu, G. Du, A. M. Asiri, Y. Yao and X. Sun, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR04344A

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