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

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 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 electrodepositon and NiFeOx NTA electrode by dipping in Fe3+ solution exhibit excellent HER and OER performance in alkaline condition. In these systems, Ni NTAs act as binder-free multifunctional inner layer to support the electrocatalytsts, offer a large specific surface area and serve as fast electron transport pathway. Moreover, an alkaline electrolyzer has been constructed using NiFeOx NTAs as anode and NiSe2 NTAs as cathode, respectively, 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.

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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, Accepted Manuscript
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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, Accepted Manuscript , DOI: 10.1039/C8NR02238K

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