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• W3044460162 endingPage "112793" @default.
• W3044460162 startingPage "112793" @default.
• W3044460162 abstract "Photochemically synthesized catalysts using (NH4)2MoOmS4-m (m = 0, 1, and 2) as raw materials were studied for the purpose of hydrogen evolution reaction (HER) from H2O. Each starting material is found to generate a composite of MoSx/RGO covered by MoO3 layer, where RGO is reduced graphene oxide. XRD, TEM, XPS, and elemental analysis of the resulting MoSx/RGO reveals that MoSx exists in an amorphous phase and is composed of Mo(IV)Sx (x≈3). The HER activity of each prepared composite is estimated by η10 (the overpotential at 10 mA cm−2 current density), Ts (the Tafel slope) from linear sweep voltammetry (LSV), and turnover frequency (TOF). The composites from m = 0, 1, and 2 show η10: 198, 206, and 297 mV vs. RHE, Ts: 49.1, 46.9, and 89.1 mV dec-1, and TOF: 0.16, 0.20, and 0.10 s−1, respectively. From the viewpoint of Ts and TOF, the composites from m = 0 and 1 display a remarkably efficient activity, but they show the decline of HER performance with the electrochemical reaction time and cycle. The composite from m = 2, however, shows less activity than the others. The origins of the prominent efficiency of the composites from m = 0 and 1 are predicted as follows: (1) Photoirradiation of the starting materials on RGO leads to a selective and confined formation of amorphous Mo(IV)Sx, which is constructed, intriguingly, by abundant reactive bridging S22- ligands. (2) The HER efficiency is related to the presence of the Mo(IV) centers and the bridging S22- ligands. The Ts data suggest that the catalytic HER proceeds by a Volmer–Heyrovsky pathway." @default.
• W3044460162 created "2020-07-29" @default.
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• W3044460162 date "2020-10-01" @default.
• W3044460162 modified "2023-10-18" @default.
• W3044460162 title "Development of highly active hydrogen evolution reaction (HER) catalysts composed of reduced graphene oxide and amorphous molybdenum sulfides derived from (NH4)2MoOmS4-m (m = 0, 1, and 2)" @default.
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• W3044460162 doi "https://doi.org/10.1016/j.jphotochem.2020.112793" @default.
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