摘要
钼硫化物被认为是一种高效的电催化析氢反应的催化剂,因此其合成方法受到了广泛的研究和关注。本文以四硫代钼酸铵和氧化石墨为前驱体,利用γ射线对其辐照还原,一步法制备了钼硫化物/还原氧化石墨烯(Mo S_x/RGO)复合材料。通过X射线光电子能谱、X射线衍射、透射电子显微镜、Raman光谱等表征手段确认复合材料中的Mo Sx为无定型结构,且氧化石墨烯得到了有效的还原。同时系统研究了吸收剂量、前驱体配比对复合材料作为析氢反应催化剂性能的影响。结果发现,Mo Sx/RGO复合材料具有优异的催化性能,其催化起始电压为110 m V,在电流密度为10 m A·cm^(-2)时过电势仅为160 m V,Tafel斜率为46 m V·dec^(-1),说明该催化剂催化析氢机理为Volmer-Heyrovesy机理。此外,Mo Sx/RGO复合材料还具有良好的催化稳定性。
Molybdenum sulfide is an efficient catalyst for the hydrogen evolution reaction （HER） and its synthesis has attracted significant attention in recent years. In this work, molybdenum sulfide/reduced graphite oxide （MoSx/RGO） was prepared by the y-ray induced reduction of ammonium tetrathiomolybdate and graphite oxide. The composition, morphology, and structure of the MoSx/RGO composites were determined by X-ray photoelectron spectroscopy （XPS）, X-ray diffraction （XRD）, transmission electron microscopy （TEM）, and Raman spectroscopy. The results confirmed the formation of amorphous MoSx/RGO composites. Subsequently, the effects of the absorbed dose and precursor ratio on the performance of the composite material as the catalyst for HER were studied systematically. The resultant MoSx/RGO composites were found to show excellent catalytic activity towards HER. With a catalyst loading of 0.275 mg.cm-2, an onset overpotential of 110 mV, a Tafel slope of 46 mV-dec-1, and a current density of 10 mA.cm-2 at the overpotential of 160 mV can be achieved. These results can beconsidered as the proof of Volmer-Heyrovesy mechanism. In addition, the MoSx/RGO catalyst also showed an excellent long-time stability during the evaluation for HER.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2017年第12期2542-2549,共8页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(11405168,11505011)资助项目~~
