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Amorphous MoSx Developed on Co(OH)2 Nanosheets Generating Efficient Oxygen Evolution Catalyst

Abstract

Exploring high-efficient and inexpensive electrocatalysts for oxygen evolution reaction (OER) is of great importance to design renewable energy storage and conversion devices. Herein, we prepare amorphous MoSx encapsulated Co(OH)2 nanosheets (aMoSx/Co(OH)2 NSs) as strongly robust and active OER electrocatalysts via three-step procedures: Firstly, Co(OH)2 nanosheets with catalytic-active octahedral MO6 structures are synthesized by hydrothermal process; Secondly, violent ultrasonication is applied to exfoliate individual nanosheets from stacked Co(OH)2 sheets, and break down into smaller ones and attach MoS42- ions uniformly on nanosheets; Thirdly, MoS42- ions are thermally decomposed into amorphous MoSx on Co(OH)2 nanosheets. The role of incorporation of the amorphous MoSx nanostructure is to enhance the surface hydrophilicity for availability of H2O and to accelerate the electron transport capability for kinetic activities. Furthermore, the interaction between MoSx and Co(OH)2 is proposed to induce the electron transfer from amorphous MoSx to Co(OH)2, which will promote the basic environment for cobalt sites, break the Co-O bond, favor for the release of O2 molecules, and thus enhance the OER process. Optimizition of Co/Mo mole ratio demonstrates that aMoSx/Co(OH)2 NSs with Co/Mo mole ratio of 8 perform the best OER activity and deliver the overpotential of 350 mV at current density of 10 mA cm−2 and Tafel slope of 65.4 mV dec−1 in 0.1 M KOH. This study enriches the researches on non-first-row (3d) metal incorporation for high-efficient OER catalysts and offers alternative substitute for noble metal catalysts.

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Publication details

The article was received on 01 Sep 2017, accepted on 11 Oct 2017 and first published on 11 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07729G
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Amorphous MoSx Developed on Co(OH)2 Nanosheets Generating Efficient Oxygen Evolution Catalyst

    F. Sun, C. Li, B. Li and Y. Lin, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07729G

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