Scalable synthesis of porous hollow CoSe2-MoSe2/carbon microspheres for highly efficient hydrogen evolution reaction in acidic and alkaline media

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DOI

  • Bo Wang, University of Electronic Science and Technology of China
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  • Zegao Wang, University of Electronic Science and Technology of China
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  • Xinqiang Wang, University of Electronic Science and Technology of China
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  • Binjie Zheng, University of Electronic Science and Technology of China
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  • Wanli Zhang, University of Electronic Science and Technology of China
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  • Yuanfu Chen, University of Electronic Science and Technology of China

For the first time, porous microspheres of bimetallic CoSe2-MoSe2 hybrids with reduced graphene oxide and amorphous carbon (CS-MS/rGO-C) are synthesized through a facile, low-cost and scalable spray drying approach and a subsequent selenization process. The CS-MS/rGO-C electrocatalyst delivers excellent performance for the hydrogen evolution reaction (HER) in both acidic and alkaline media: in acidic solution, CS-MS/rGO-C has a very low onset potential of -142 mV vs. RHE and a low Tafel slope of 51.3 mV dec(-1), and the overpotential at -10 mA cm(-2) is as low as -195 mV vs. RHE; in alkaline media, the onset potential of CS-MS/rGO-C is -125 mV vs. RHE, and the Tafel slope is 83.2 mV dec(-1), and the overpotential at -10 mA cm(-2) is -215 mV vs. RHE. Moreover, it has outstanding long-term stability in both media even after 1000 cycles. The outstanding HER performance of CS-MS/rGO-C can be attributed to its bi-metallic composition, porous rGO-C microsphere structure, and conductive rGO-C skeleton, which can not only provide abundant active sites, but also guarantee high conductivity for CS-MS, thus facilitating the charge transfer. This work provides new insights into scalable synthesis of low-cost electrocatalysts with high efficiency and long-term stability, which can be extended to large-scale production of other advanced electrocatalysts to replace precious Pt-based catalysts for hydrogen evolution.

Original languageEnglish
JournalJournal of Materials Chemistry A
Volume6
Issue26
Pages (from-to)12701-12707
Number of pages7
ISSN2050-7488
DOIs
Publication statusPublished - 14 Jul 2018

    Research areas

  • LITHIUM-ION BATTERIES, STABLE ELECTROCATALYST, HIERARCHICAL ARCHITECTURE, CARBON NANOWIRES, GRAPHENE, NANOSHEETS, PERFORMANCE, NANOCRYSTALS, CATALYST, ANODE

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