Nitrogen‐Doped Foam‐like Carbon Plate Consisting of Carbon Tubes as High‐Performance Electrode Materials for Supercapacitors

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Abstract
A nitrogen‐doped foam‐like 3D carbon plate is prepared by carbonizing a selected biomass precursor of pomelo peel. The carbon plate is composed of interwoven connected carbon tubes and shows a unique 3D interpenetrating macroporous network with binary‐channel structure. Owing to the proper pore structures, short ion‐diffusion paths, high conductivity, and high structure stability, the carbon plate exhibits excellent electrochemical performance as an electrode for supercapacitors directly. A high specific capacitance of up to 338 F g−1 at 1 A g−1, good rate capability with a capacitance retention of 59 % at 20 A g−1, and high cycling stability with only 4 % capacitance loss after 5000 cycles at 20 A g−1 can be achieved in 6 m KOH electrolyte in a three‐electrode system. Furthermore, a symmetric supercapacitor fabricated by using the carbon plates delivers an energy density of 11.05 Wh kg−1 at a power density of 250 W kg−1, and an outstanding cycling stability with only 2.4 % capacitance decay over 5000 cycles at 5 A g−1 in 6 m KOH electrolyte. These very attractive electrochemical properties indicate that the carbon plate derived from pomelo peel is a promising electrode material for supercapacitors.
Funding Information
  • National Natural Science Foundation of China (51402146)
  • National Natural Science Foundation (20142BAB213018)
  • GanPo 555 Talent Project
  • Science and Technology Planning Project (20151BBG70019, 2013ZBBG70020)

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