One step synthesis of N, P co-doped hierarchical porous carbon nanosheets derived from pomelo peel for high performance supercapacitors
Journal of Colloid and Interface Science(2022)
摘要
Ammonium dihydrogen phosphate (NH4H2PO4) was used as an activator and co-dopant to induce the synthesis of N, P co-doped porous carbon nanosheets (NPCNs) from pomelo peel for using as high-performance supercapacitors. Pomelo peel has a unique sponge-like structure in which NH4H2PO4 particles can be evenly embedded. The pore structure and heteroatomic doping amount of NPCNs were controlled by adjusting the pyrolysis temperature. As a result, the optimal sample exhibits high specific capacitance (314 ± 2.6 F g−1) and rate capability (82% of capacitance retention at 20 A g−1). NPCNs-750 was further employed in a symmetrical supercapacitor (NPCNs-750//NPCNs-750 SSC) with 2 M Li2SO4 electrolyte, and exhibits a high energy density of 36 ± 1.5 W h kg−1 at a power density of 1000 W kg−1, with excellent cycling stability with 99% retention after 10,000 cycles. A series of excellent results show that this pollution-free and cost-effective method can be used for the design and preparation of high-performance supercapacitor electrode materials.
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关键词
Biomass-derived carbon,N, P co-doping,Carbon nanosheets,Supercapacitors
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