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Issue 23, 2019
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Surface intercalated spherical MoS2xSe2(1−x) nanocatalysts for highly efficient and durable hydrogen evolution reactions

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Abstract

An efficient hydrogen evolution reaction (HER) depends essentially on high-performing electrocatalysts. The aggregation of catalysts normally deteriorates their activity and stability. In this study, a two-step route was used to synthesize surface intercalated well-dispersed spherical MoS2xSe2(1−x) nanocatalysts. The resulting catalysts present a highly active and stable performance towards the HER with an overpotential of −143 mV at 10 mA cm−2, and a Tafel slope of 53.8 mV dec−1. The mechanism for the enhanced HER was analyzed and was attributed to three factors: (i) large numbers of defects and edge active sites arising from the coexistence of S and Se elements; (ii) enhanced electric conductivity arising from the phase transition from the semiconducting 2H-phase to metallic 1T-phase during the intercalation process; and (iii) enlarged contact areas between active sites and electrolyte caused by the increased surface roughness due to the surface intercalation. This work not only deepens our understanding of the improved HER performance of surface intercalated catalysts, but also provides novel strategies for preparing durable electrocatalysts through surface engineering.

Graphical abstract: Surface intercalated spherical MoS2xSe2(1−x) nanocatalysts for highly efficient and durable hydrogen evolution reactions

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Publication details

The article was received on 21 Mar 2019, accepted on 30 Apr 2019 and first published on 30 Apr 2019


Article type: Paper
DOI: 10.1039/C9DT01218D
Dalton Trans., 2019,48, 8279-8287

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    Surface intercalated spherical MoS2xSe2(1−x) nanocatalysts for highly efficient and durable hydrogen evolution reactions

    B. Lin, Z. Lin, S. Chen, M. Yu, W. Li, Q. Gao, M. Dong, Q. Shao, S. Wu, T. Ding and Z. Guo, Dalton Trans., 2019, 48, 8279
    DOI: 10.1039/C9DT01218D

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