Advanced Functional Materials · 2017 · 252 citations · 30 references
Natural SciencesChemical EngineeringMaterials ScienceCatalysisMaterials ChemistryNanomaterialsCatalytic MaterialsElectrode MaterialsMetal Oxide NanomaterialsNanocompositesNanoenergy MaterialsNanostructured Energy MaterialsCatalyst OverpotentialEfficiencyElectrocatalytic NanomaterialsElectrocatalytic Surface ReactionsHydrogen EvolutionHydrogen Evolution CatalystsHydrogen Evolution ReactionMetal Oxide Nanocatalysts
High overpotentials and low efficiency are two main factors that restrict the practical application for MoS 2 , the most promising candidate for hydrogen evolution catalysis. Here, RhMoS 2 nanocomposites, the addition of a small amount of Rh (5.2 wt%), exhibit the superior electrochemical hydrogen evolution performance with low overpotentials, small Tafel slope (24 mV dec −1 ), and long term of stability. Experimental results reveal that 5.2 wt% RhMoS 2 nanocomposite, even exceeding the commercial 20 wt% Pt/C when the potential is less than −0.18 V, exhibits an excellent mass activity of 13.87 A mg metal −1 at −0.25 V, four times as large as that of the commercial 20 wt% Pt/C catalyst. The hydrogen yield of 5.2 wt% RhMoS 2 nanocomposite is 26.3% larger than that of the commercial 20 wt% Pt/C at the potential of −0.25 V. The dramatically improved electrocatalytic performance of RhMoS 2 nanocomposites may be attributed to the hydrogen spillover from Rh to MoS 2 .
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