α-MoC/石墨烯复合材料的氧还原性能及其在微生物燃料电池中的应用

Research on the oxygen reduction performance of α-MoC/graphene and its application in microbial fuel cells

用改良Hummers法和碳热还原法分别制备了石墨烯和碳化钼。用扫描电子显微镜和XRD表征了材料的形貌和结构。用循环伏安和线性扫描测试了材料的氧还原催化性能,结果发现,复合材料的氧还原峰电流和起峰电位均大大优于单一材料,表现出较好的催化性能。含有12mg/cm^2α-MoC碳化钼/石墨烯复合材料作为阴极催化剂的MFCs最大功率密度为417.6m W/m^2,达到商业铂碳的68.2%。因此,廉价的α-MoC/石墨烯复合材料作为MFCs阴极氧还原催化剂具有巨大的应用潜力。

The graphene and molybdenum carbide were prepared by the modified Hummers method and carbon thermal reduction method,respectively. The morphology of the materials were revealed using scanning electron microscope（SEM）,and the structures were characterized with XRD. The electro catalytic activity of oxygen reduction of the materials were measured by cyclic voltammetry（CV）and linear sweep voltammetry（LSV）. The results revealed that α-MoC/graphene composite exhibited better electro catalytic activity than pure graphene or α-MoC,with a higher oxygen reduction peak current and more positive onset potential. The microbial fuel cell assembled with 12mg/cm^2 α-MoC/graphene composite as cathode catalyst delivered a higher power density of 417.6m W/m^2,which was 68.2% of that obtained using Pt/C-catalyst cathode. Therefore,using the inexpensive α-MoC /graphene composites as MFCs cathode oxygen reduction catalyst holds great potential for application.