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Issue 12, 2017
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Facile electrochemical preparation of self-supported porous Ni–Mo alloy microsphere films as efficient bifunctional electrocatalysts for water splitting

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Abstract

The exploration of low-cost, stable, and robust electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is urgently needed for developing renewable-energy storage and conversion techniques. In this study, we report a facile one-step electrodeposition route to prepare self-supported porous Ni–Mo alloy microsphere (Ni–Mo MS) films directly grown on copper foils from a deep eutectic solvent, ethaline (mixture of choline chloride and ethylene glycol), as a highly efficient and durable catalyst for both the HER and OER in 1.0 M KOH. The prepared Ni–Mo MS/Cu, as a hydrogen-evolving cathode, shows remarkable catalytic performance toward the HER with a small Tafel slope of 49 mV dec−1 and a low HER overpotential of −63 mV to deliver 20 mA cm−2. Serving as an oxygen-evolving anode, the catalyst also offers excellent OER catalytic activity with a moderate Tafel slope of 108 mV dec−1, and reaches 20 mA cm−2 at an OER overpotential of 335 mV. Utilized as both the cathode and anode in a symmetric two-electrode water electrolysis system, the bifunctional catalyst requires a cell voltage of 1.59 V to reach an overall water splitting current density of 10 mA cm−2 with robust durability, which could be potentially used in water splitting devices for practical applications.

Graphical abstract: Facile electrochemical preparation of self-supported porous Ni–Mo alloy microsphere films as efficient bifunctional electrocatalysts for water splitting

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Publication details

The article was received on 16 Dec 2016, accepted on 16 Feb 2017 and first published on 17 Feb 2017


Article type: Paper
DOI: 10.1039/C6TA10812A
Citation: J. Mater. Chem. A, 2017,5, 5797-5805
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    Facile electrochemical preparation of self-supported porous Ni–Mo alloy microsphere films as efficient bifunctional electrocatalysts for water splitting

    M. Y. Gao, C. Yang, Q. B. Zhang, J. R. Zeng, X. T. Li, Y. X. Hua, C. Y. Xu and P. Dong, J. Mater. Chem. A, 2017, 5, 5797
    DOI: 10.1039/C6TA10812A

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