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Optimization of the Facet Structure of Cobalt Oxide Catalysts for Enhanced Hydrogen Evolution Reaction

Abstract

The structure-property relationship plays a crucial role in further exploring the mechanism of hydrogen production by photocatalytic water splitting. Here, we utilize a simple hydrothermal method to synthesize three Co3O4 catalysts with different exposed crystal facets to elucidate its catalytic mechanism at the atomic level. The Co3O4 micron flower, nanotruncated octahedron and nanorod are mainly exposed to {112}, {011} and {001} crystal planes, respectively, and the concentration and distribution of Co2+ and Co3+ active sites on the surface are different. Further results indicate that the {112} and {011} planes with abundant Co3+ sites exhibit catalytic activity superior to the {001} plane. Surface atomic configuration and EPR studies manifest that the presence of octahedral coordinated Co3+ sites optimizes photocatalytic hydrogen evolution reaction activity. This work reveals the importance of regulating surface atomic configuration and catalytic active sites, and opens a new avenue for the development of solar-driven water splitting.

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Publication details

The article was received on 20 Sep 2019, accepted on 27 Nov 2019 and first published on 27 Nov 2019


Article type: Paper
DOI: 10.1039/C9CY01900F
Catal. Sci. Technol., 2019, Accepted Manuscript

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    Optimization of the Facet Structure of Cobalt Oxide Catalysts for Enhanced Hydrogen Evolution Reaction

    M. Wu, S. Ke, W. Chen, S. Zhang, M. Zhu, Y. Zhang, M. Foo and L. Tang, Catal. Sci. Technol., 2019, Accepted Manuscript , DOI: 10.1039/C9CY01900F

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