Abstract
Tungsten oxide, originally poor in capacitive performance, was made an excellent electrode material for supercapacitors, by dispersing it to carbon aerogels (CA), a conductive and mesoporous hosting template, that drastically improved the utilization of WO3 for capacitance generation. The WO3 was introduced to the CA, in a form of well-dispersed single crystalline nanoparticles of 15–40nm in size, with a simple immersion-calcination process. A one order of magnitude improvement in specific capacitance was achieved with the present composition, from 54F/g for WO3 nanoparticles to 700F/g for WO3/CA composites (scaned at 25mV/s in 0.5M H2SO4 over a potential window of −0.3 to 0.5V). The WO3/CA composites exhibited an excellent high rate capability with a 60% retention in specific capacitance at 500mV/s, almost perfect cycle efficiency of 99%, and outstanding cycling stability of only 5% decay in specific capacitance after 4000 cycles.
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