Abstract
The lateral size of individual graphene sheets is expected to impact the electrochemical properties of reduced graphite oxide nanosheets (rGOns). The size effect on the specific capacitance of rGOns was investigated by breaking down the size of rGOns using high-frequency ultrasonification. The specific capacitance of rGOns prepared by hydrogen reduction of GOns with an average equivalent diameter of 280 nm was 242 F g−1 in 0.5 M H2SO4 and 205 F g−1 in 0.5 M Na2SO4. The specific capacitance was 30% higher to that of larger-sized GOns with diameter of 920 nm. The area normalized capacitance ranged between 70 to 138 µF cm−2, with larger-sized rGOns affording higher values. The cause of this size-effect is discussed based on the microstructure of the rGOns electrode as well as the edge/plane ratio.
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