Issue 43, 2017

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

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

Supplementary files

Article information

Article type
Paper
Submitted
30 Aug 2017
Accepted
03 Oct 2017
First published
03 Oct 2017

J. Mater. Chem. A, 2017,5, 22568-22575

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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