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Issue 43, 2017
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Facile synthesis of Cu doped cobalt hydroxide (Cu–Co(OH)2) nano-sheets for efficient electrocatalytic oxygen evolution

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Abstract

We report herein the facile synthesis of cobalt hydroxide nano-sheets with a uniform ultrathin structure under mild conditions. By doping heteroatoms such as Cu, the nanosheets' morphology and dimension can be well-tuned. The prepared heteroatom-doped cobalt hydroxide nano-sheets exhibit excellent catalytic activity and durability toward the oxygen evolution reaction (OER). In particular, Cu-doped cobalt hydroxide (Cu–Co(OH)2) shows an electrocatalytic current density of 10 mA cm−2 and a mass activity of 46 A g−1 at the overpotential of 300 mV, and a Tafel slope of 47 mV dec−1, which are markedly higher than those of the state-of-the-art IrO2. Importantly, X-ray photoelectron spectroscopy (XPS) suggests the modulated electronic structure by the heteroatom doping, which implies that Co ions are more positively charged than the normal 2+ and is thus in favor of the OER performance. This work presents a green and facile strategy for the synthesis of heteroatom in situ doped ultrathin hydroxides which show excellent performance for the OER. A possible OER mechanism of this heteroatom doped Co(OH)2 material has also been proposed.

Graphical abstract: Facile synthesis of Cu doped cobalt hydroxide (Cu–Co(OH)2) nano-sheets for efficient electrocatalytic oxygen evolution

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Publication details

The article was received on 30 Aug 2017, accepted on 03 Oct 2017 and first published on 03 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07637A
Citation: J. Mater. Chem. A, 2017,5, 22568-22575
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    Facile synthesis of Cu doped cobalt hydroxide (Cu–Co(OH)2) nano-sheets for efficient electrocatalytic oxygen evolution

    L. Chen, H. Zhang, L. Chen, X. Wei, J. Shi and M. He, J. Mater. Chem. A, 2017, 5, 22568
    DOI: 10.1039/C7TA07637A

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