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Gold atom-decorated CoSe2 nanobelts with engineered active sites for enhanced oxygen evolution

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Abstract

Electrochemical water splitting is greatly hindered by the kinetically sluggish oxygen evolution reaction (OER). The development of economical and efficient catalysts with precisely modulated active sites is crucial for exploring the reaction mechanism and promoting the water oxidation process. Herein, we present isolated Au atom-decorated CoSe2 (Au1–CoSe2) nanobelts with precisely engineered active sites for an enhanced OER. Theoretical investigations showed that the decoration of isolated Au atoms could shift up the d-band center and thus lower the H2O adsorption energy of Co active sites. Moreover, the trace amount of Au atoms (0.1 wt%) also ensures the effective exposure of Co active sites and minimizes the use of Au. Both the intrinsically enhanced H2O adsorption and the sufficient exposure of active sites contributed to the remarkable electrocatalytic performance of the Au1–CoSe2 nanobelts. The as-prepared Au1–CoSe2 nanobelts exhibited a 21.1-fold, 5.7-fold, and 1.9-fold higher OER activity relative to pure CoSe2 nanobelts, Au nanoparticle-deposited CoSe2 (AuN–CoSe2) nanobelts, and commercial Ir/C, respectively. This study demonstrates the validity of atomic-scale control of active sites in Co-based catalysts, which could also be extended to the design of highly efficient catalysts for other energy-related processes.

Graphical abstract: Gold atom-decorated CoSe2 nanobelts with engineered active sites for enhanced oxygen evolution

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Publication details

The article was received on 14 Jul 2017, accepted on 31 Aug 2017 and first published on 31 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA06172B
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Gold atom-decorated CoSe2 nanobelts with engineered active sites for enhanced oxygen evolution

    X. Zhao, P. Gao, Y. Yan, X. Li, Y. Xing, H. Li, Z. Peng, J. Yang and J. Zeng, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA06172B

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