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Issue 19, 2018
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Ni nanotube array-based electrodes by electrochemical alloying and de-alloying for efficient water splitting

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Abstract

The design of cost-efficient earth-abundant catalysts with superior performance for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is extremely important for future renewable energy production. Herein, we report a facile strategy for constructing Ni nanotube arrays (NTAs) on a Ni foam (NF) substrate through cathodic deposition of NiCu alloy followed by anodic stripping of metallic Cu. Based on Ni NTAs, the as-prepared NiSe2 NTA electrode by NiSe2 electrodeposition and the NiFeOx NTA electrode by dipping in Fe3+ solution exhibit excellent HER and OER performance in alkaline conditions. In these systems, Ni NTAs act as a binder-free multifunctional inner layer to support the electrocatalysts, offer a large specific surface area and serve as a fast electron transport pathway. Moreover, an alkaline electrolyzer has been constructed using NiFeOx NTAs as the anode and NiSe2 NTAs as the cathode, which only demands a cell voltage of 1.78 V to deliver a water-splitting current density of 500 mA cm−2, and demonstrates remarkable stability during long-term electrolysis. This work provides an attractive method for the design and fabrication of nanotube array-based catalyst electrodes for highly efficient water-splitting.

Graphical abstract: Ni nanotube array-based electrodes by electrochemical alloying and de-alloying for efficient water splitting

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Publication details

The article was received on 18 Mar 2018, accepted on 16 Apr 2018 and first published on 17 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR02238K
Citation: Nanoscale, 2018,10, 9276-9285
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    Ni nanotube array-based electrodes by electrochemical alloying and de-alloying for efficient water splitting

    X. Teng, J. Wang, L. Ji, Y. Lv and Z. Chen, Nanoscale, 2018, 10, 9276
    DOI: 10.1039/C8NR02238K

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