FABRICATION OF GRAPHENE/CARBON NANOTUBE PAPER DECORATED WITH NANONEEDLE MANGANESE OXIDE ON THE OUTERMOST GRAPHENE SHEETS FOR SUPERCAPACITORS

摘要

Over the past few years,the rapid development of renewable energy(e.g.,solar and wind energy)has increased the need for sustainable energy storage technologies in order to address the challenges of increasing energy demands and the cyclic nature of renewable energy sources. Due to their high power density, moderate energy density,good operational safety,and long cycling life,electrochemical double layer capacitors or supercapacitors have been extensively explored,and have become a promising technique for various emerging energy applications in high-power electronic devices,electric vehicles,and hybrid electric vehicles. Due to the large surface area(~2630 m ~2 g ~(-1) ),excellent electronic conductivity, outstanding chemical stability,and good physical properties of graphene,many studies up to now have focused on graphene-based composites for supercapacitor applications ;however,it should be noted that most of the working electrodes reported in the literature have been binder-enriched electrodes produced by conventional slurry-coating technology.In this process,the binder decreases the electrical conductivity of the electrode materials,hindering potential applications in high-performance supercapacitors. In order to obtain ideal electrochemical performance,it is very important to develop novel,flexible,and binder-free electrode materials for supercapacitors.