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Hierarchically Structured Ni Nanotube Array-Based Integrated Electrodes for Water Splitting

Abstract

The development of high-performance nonprecious electrocatalysts for overall water splitting has attracted increasing attention but remains a vital challenge. Herein, we report a ZnO-based template method to fabricate Ni nanotube arrays (NTAs) anchored on nickel foil for applications in the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). On the basis of this precursor electrode, the three-dimensional NiSe<sub>2</sub> NTAs of unique sandwich-like coaxial structure have been fabricated by electrodeposition of NiSe<sub>2</sub> on Ni NTAs, which exhibits high performance toward the HER in both acidic and alkaline media. The method based on Ni NTAs can be readily extended to fabricate Ni<sub>2</sub>P NTAs by gas–solid phosphorization for the HER, and NiFeO<sub><i>x</i></sub> NTAs by anodic codeposition of Ni and Fe for the OER. Consequently, an alkaline electrolyzer has been constructed using NiFeO<sub><i>x</i></sub> NTAs and NiSe<sub>2</sub> NTAs as anode and cathode, respectively, which can realize overall water splitting with a current density of 100 mA cm<sup>–2</sup> at an overpotential of 510 mV

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The Francis Crick Institute

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Last time updated on 12/02/2018

This paper was published in The Francis Crick Institute.

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