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A general approach to synthesise ultrathin NiM (M = Fe, Co, Mn) hydroxide nanosheets as high-performance low-cost electrocatalysts for overall water splitting

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Abstract

Electrochemically splitting water into hydrogen (H2) and oxygen (O2) is a promising method for clean energy generation, while the absence of highly active, stable, low-cost and earth abundant catalysts greatly impedes its large-scale application. Herein, we report a general and robust approach for the controlled synthesis of a class of NiM (M = Fe, Co, Mn) hydroxide nanosheets (HNSs) that have ultrathin thicknesses of around 2 nm. Such unique structures enable the HNSs to have promising oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) performances, with the NiFe HNSs being the best candidate. Given the well-defined electrochemical bifunctionality, a full alkaline electrolyzer was constructed using NiFe HNSs as both the cathodic and the anodic catalysts. It can realize overall water splitting with a current density of 10 mA cm−2 at 1.67 V and has remarkable durability for 12 h. This work opens a new avenue to approach water splitting catalysis using efficient low-cost Ni-based HNSs.

Graphical abstract: A general approach to synthesise ultrathin NiM (M = Fe, Co, Mn) hydroxide nanosheets as high-performance low-cost electrocatalysts for overall water splitting

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Publication details

The article was received on 08 Mar 2017, accepted on 30 Mar 2017 and first published on 30 Mar 2017


Article type: Communication
DOI: 10.1039/C7TA02091K
Citation: J. Mater. Chem. A, 2017, Advance Article
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    A general approach to synthesise ultrathin NiM (M = Fe, Co, Mn) hydroxide nanosheets as high-performance low-cost electrocatalysts for overall water splitting

    X. Sun, Q. Shao, Y. Pi, J. Guo and X. Huang, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA02091K

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