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Issue 43, 2017
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Identification of pH-dependent synergy on Ru/MoS2 interface: a comparison of alkaline and acidic hydrogen evolution

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Abstract

Engineering bifunctional interfaces for enhanced alkaline hydrogen evolution reaction (HER) kinetics is achieved by rational coupling of Ru nanoparticles and defect-rich MoS2 nanosheets via a simple wet-chemical method. Comprehensive material characterizations, especially high-resolution transmission electron microscopy, reveal well-defined interfaces between both components, leading to interfacial synergy whereby Ru expedites water dissociation and nearby defect-rich MoS2 enables favorable hydrogen adsorption for recombination into H2. The designed Ru/MoS2 material demonstrates remarkable catalytic activity towards alkaline HER (−13 mV at −10 mA cm−2) with stable operation after 12 h or 1000 cycles, which is superior to almost all Ru-based and MoS2-based electrocatalysts and even outperforms commercial 20 wt% Pt/C at overpotentials larger than −78 mV in alkaline media. No improved HER activity is observed for Ru/MoS2 in acidic electrolyte (−96 mV at −10 mA cm−2), which is even inferior to Ru/CP (−78 mV at −10 mA cm−2). The correlation between alkaline and acidic HER results confirms that the intrinsic HER activity of this material originates from the desired synergistic effect under alkaline conditions.

Graphical abstract: Identification of pH-dependent synergy on Ru/MoS2 interface: a comparison of alkaline and acidic hydrogen evolution

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Publication details

The article was received on 17 Aug 2017, accepted on 19 Oct 2017 and first published on 20 Oct 2017


Article type: Communication
DOI: 10.1039/C7NR06111K
Nanoscale, 2017,9, 16616-16621

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    Identification of pH-dependent synergy on Ru/MoS2 interface: a comparison of alkaline and acidic hydrogen evolution

    J. Liu, Y. Zheng, D. Zhu, A. Vasileff, T. Ling and S. Qiao, Nanoscale, 2017, 9, 16616
    DOI: 10.1039/C7NR06111K

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