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dc.contributor.authorYu, J.
dc.contributor.authorGuo, Y.
dc.contributor.authorMiao, S.
dc.contributor.authorNi, M.
dc.contributor.authorZhou, W.
dc.contributor.authorShao, Zongping
dc.date.accessioned2018-12-13T09:11:02Z
dc.date.available2018-12-13T09:11:02Z
dc.date.created2018-12-12T02:47:04Z
dc.date.issued2018
dc.identifier.citationYu, J. and Guo, Y. and Miao, S. and Ni, M. and Zhou, W. and Shao, Z. 2018. Spherical Ruthenium Disulfide-Sulfur-Doped Graphene Composite as an Efficient Hydrogen Evolution Electrocatalyst. ACS Applied Materials and Interfaces. 10 (40): pp. 34098-34107.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/71686
dc.identifier.doi10.1021/acsami.8b08239
dc.description.abstract

© 2018 American Chemical Society. The exploition of cost-efficient and high-performance catalysts to boost hydrogen generation in overall water splitting is crucial to economically obtain green hydrogen energy. Herein, we propose a novel electrocatalyst consisting of spherical RuS2 on S-doped reduced graphene oxide (s-RuS2/S-rGO) with high catalytic behavior toward hydrogen evolution reaction (HER) in all pH conditions, especially in alkaline electrolytes. RuS2/S-rGO delivers small overpotentials of 25 and 56 mV at current densities of 10 and 50 mA cm-2, respectively, and a low Tafel slope of 29 mV dec-1 with good stability for 100 h in basic solutions. This performance is comparable to and even exceeds that of documented representative electrocatalysts, including the benchmark Pt/C; since the price of Ru is about 1/25th that of Pt, this novel electrocatalyst offers a low-cost alternative to Pt-based HER electrocatalysts. Ruthenium-centered sites of RuS2 in this hybrid catalyst are responsible for the HER active sites, and S doping in RuS2 also exerts an important function for the HER activity; density functional theory calculations disclose that the water dissociation ability and adsorption free energy of hydrogen intermediate adsorption (?GH*) for RuS2 are very close to those of Pt. A homemade electrolyzer with an s-RuS2/S-rGO (cathode)//RuO2/C (anode) couple presents a relatively low voltage of 1.54 V at a current density of 20 mA cm-2, while maintaining negligible deactivation over a 24 h operation.

dc.publisherAmerican Chemical Society
dc.titleSpherical Ruthenium Disulfide-Sulfur-Doped Graphene Composite as an Efficient Hydrogen Evolution Electrocatalyst
dc.typeJournal Article
dcterms.source.volume10
dcterms.source.number40
dcterms.source.startPage34098
dcterms.source.endPage34107
dcterms.source.issn1944-8244
dcterms.source.titleACS Applied Materials and Interfaces
curtin.departmentWASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
curtin.accessStatusFulltext not available


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