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Transition metal dichalcogenides (TMDs), with the general formula MX2 (M = Mo/W/Fe/Co/Ni, etc.; X = S/Se/Te), have attracted extensive research interests for hydrogen evolution reaction (HER). Compared with numerous studies on noble-metal-free TMDs, the chalcogen-dependent HER catalytic properties of noble-metal-based TMDs are lack of sufficient research attention. Herein, a facile electrospinning-assisted synthetic strategy is proposed to synthesize ruthenium dichalcogenides (RuX2, X = S/Se/Te) nanoparticles decorated carbon nanofibers (CNFs). Benefiting from the identical nanofibrous morphology and exposed crystal planes of RuX2 (111), the catalytic activities of RuX2@CNFs samples were investigated and compared in a fair and direct manner. Detailed electrochemical measurements coupled with density functional theory calculations were carried out to probe their intrinsic HER catalytic activities, resulting in the catalytic activity order of RuS2@CNFs > RuSe2@CNFs > RuTe2@CNFs in acidic media and that of RuS2@CNFs > RuTe2@CNFs > RuSe2@CNFs in alkaline media. The superior catalytic performance of RuS2@CNFs mainly stems from the relative lower HER energy barriers and thereby the higher intrinsic catalytic activity of RuS2 (111), leading to ultralow overpotentials of 44 and 9 mV at 10 mA·cm−2 in acidic and alkaline media, respectively. RuSe2 (111) is endowed with the more optimized Gibbs free energy of hydrogen adsorption (ΔGH*) than RuTe2 (111), but RuTe2 (111) shows enhanced catalytic property for H2O dissociation and OH− desorption than RuSe2 (111), therefore, resulting in the altered catalytic activity sequences for RuSe2 and RuTe2 in acidic and alkaline media.
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