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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 280nm was 242Fg−1 in 0.5M H2SO4 and 205Fg−1 in 0.5M Na2SO4. The specific capacitance was 30% higher to that of larger-sized GOns with diameter of 920nm. The area normalized capacitance ranged between 70 to 138μFcm−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. © The Electrochemical Society of Japan, All rights reserved.

Lateral Size Effect on Electrochemical Capacitor Performance of Reduced Graphite Oxide Nanosheets