Synergistic effect of ascorbic acid on the synthesis of mesoporous rGO-MoS2(100) nanocomposites and promotion of hydrogen evolution reaction

摘要: Abstract We report a new method for the preparation of MoS2 (100)-reduced graphene oxide (rGO) nanocomposites enhancement HER. Ascorbic acid synergistically is applied to reduce and controls sulfur content resulted in texturing (100) by up taking proposing Mo(VI) oxidation state. Variety characterization were performed support this hypothesis including XRD, FESEM, TEM, EDX elemental mapping, XPS, Raman, FT-IR UV–Vis spectroscopies, TGA BET-BJH analyses. By incorporating ascorbic synthesis process, atomic ratio S Mo 0.02 rGO-Mo(VI)S2 hybrid structure with quenched (002) Bragg diffraction peak. rGO-MoS2 shows net 0.08 mA cm−2 polarized photocurrent light off-on measurement. A Tafel slope 44 mV.dec−1, an exchange current 0.62 mA cm−2, over potential 156 mV 10 mA cm−2 onset 25 mV was obtained. This opens pass way simple cheap controlled defective MoS2-rGO structures crystal growth enhanced Hydrogen Evolution Reaction using acid. Mechanisms role on formation such as well process HER have been suggested.