Performance of MoS_2-reduced graphene oxide nanocomposites in supercapacitors and in oxygen reduction reaction

摘要

Considering the desirable attributes of nanosheets of molybdenum disulfide (MoS_2) and reduced graphene oxidern(RGO), the authors prepared composites of the two and investigated their use in supercapacitors. The best resultsrnwere obtained with the MoS_2:RGO (1:2) composite, which exhibited a specific capacitance of 416 F/g at 5 mV/s.rnThey also studied the oxygen reduction reaction (ORR) activity of MoS2–RGO composites. Among the MoS_2–RGOrnnanocomposites, the 1:2 composite showed the best ORR activity, since the attributes for a good supercapacitorrnperformance are reported for this property as well. The excellent performance of the MoS_2–RGO (1:2) composite isrnattributed to the combined effect of the good electrical conductivity of RGO and the unique surface properties ofrnMoS_2 as well as of RGO. This study indicates that good supercapacitor performance and ORR activity are governedrnby common factors.