Green pepper-derived hierarchical porous carbon for supercapacitors with high performance†
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Abstract
Renewable, low-cost and environmentally friendly porous carbon for high performance carbon electrode materials has attracted considerable attention in the energy conversion and storage fields. Herein, we have developed a sustainable route to fabricate porous carbon materials derived from green peppers through conventional thermal annealing and KOH-activation. The as-prepared GPAC-4 with a hierarchical porous structure exhibits a high specific surface area of 1052.70 m2 g−1 and a high capacitance of 863.1 F g−1 at 1 A g−1 as well as a good capacitance retention ratio of 97.80% at 10 A g−1 over 10 000 cycles. Moreover, the assembled supercapacitor exhibits a capacitance of 214.45 F g−1 at 1 A g−1, which corresponds to a maximum energy of 42.89 W h kg−1 at a power density of 1.2 kW kg−1. Furthermore, the supercapacitor demonstrates good cycling stability with a low loss of 3.73% over 10 000 charge–discharge cycles. These findings could open up an exciting field for exploring reproducible vegetables as the raw materials for high performance supercapacitors.
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