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Issue 13, 2017
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Co-based nanowire films as complementary hydrogen- and oxygen-evolving electrocatalysts in neutral electrolyte

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Abstract

Designing and developing non-noble-metal electrocatalysts for efficient full water splitting at neutral pH is highly desired but still remains a huge challenge. In this communication, we report the development of homologous Co-based nanowire films, Co2N nanowire film on a Ti mesh (Co2N/TM) and Co-phosphate nanowire film on a Ti mesh (Co–Pi/TM), as complementary catalysts for stable electrochemical hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in neutral electrolyte. Co2N/TM shows remarkable HER activity with the need of an overpotential of 290 mV to drive 10 mA cm−2 in 1.0 M phosphate-buffered saline (PBS), and Co–Pi/TM is superior in OER activity affording 10 mA cm−2 at overpotentials of only 430 and 300 mV in 0.1 and 1.0 M PBS, respectively. The two-electrode water electrolyzer using Co2N/TM as a cathode and Co–Pi/TM as an anode affords a water-splitting current density of 10 mA cm−2 at a cell voltage of 1.78 V with 100% Faradaic efficiency in 1.0 M PBS, promising the practical uses of such homologous Co-based catalyst materials in technological devices.

Graphical abstract: Co-based nanowire films as complementary hydrogen- and oxygen-evolving electrocatalysts in neutral electrolyte

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Publication details

The article was received on 12 Apr 2017, accepted on 22 May 2017 and first published on 23 May 2017


Article type: Communication
DOI: 10.1039/C7CY00703E
Citation: Catal. Sci. Technol., 2017,7, 2689-2694
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    Co-based nanowire films as complementary hydrogen- and oxygen-evolving electrocatalysts in neutral electrolyte

    L. Zhang, L. Xie, M. Ma, F. Qu, G. Du, A. M. Asiri, L. Chen and X. Sun, Catal. Sci. Technol., 2017, 7, 2689
    DOI: 10.1039/C7CY00703E

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