Electrochemical performance of graphene-coated activated mesocarbon microbeads as a supercapacitor electrode.

4(c) and (d) , the specific capacitances were found to be 226, 241, and 265 F g −1 at 0.1 A g −1 , and 169, 168 and 221 F g −1 at 1 A g −1 when the samples were activated at 800 °C for 0, 0.5 and 1 h, respectively, generally presenting an increasing trend with time.

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When activated at 1000 °C, the specific capacitances were 178, 147 and 110 F g −1 at 0.1 A g −1 , and 142, 128, and 100 F g −1 at 1 A g −1 for activation times of 0, 0.5 and 1 h, respectively, showing a decreasing trend with time.

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