Pumpkin‐Derived Porous Carbon for Supercapacitors with High Performance |
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| Authors: | Suying Bai Dr Guangqun Tan Dr Xiaoqin Li Dr Qian Zhao Yan Meng Yujue Wang Dr Yongzhi Zhang Prof Dan Xiao |
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| Affiliation: | 1. College of Chemical Engineering, Sichuan University, Chengdu, P.?R. China;2. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, P.?R. China;3. College of Chemistry, Sichuan University, Chengdu, P.?R. China |
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| Abstract: | Pumpkin has been employed for the first time as a renewable, low‐cost precursor for the preparation of porous carbon materials with excellent performance. Unlike most other precursors, pumpkin is rich in sugars and starch, and it has advantageous properties for large‐scale production. The as‐prepared materials adopted a unique morphology that consisted of numerous fused sphere‐like carbon grains with a high specific surface area (2968 m2 g?1), abundant micro and mesopores, and excellent electrochemical properties. The pumpkin‐derived activated carbon (PAC) material not only exhibited a high specific capacitance of 419 F g?1, but also showed considerable cycling stability, with 93.6 % retention after 10 000 cycles. Moreover, a symmetrical supercapacitor that was based on PAC showed a high energy density of 22.1 W h kg?1 in aqueous electrolyte. These superior properties demonstrate that PAC holds great promise for applications in electrochemical energy‐storage devices. |
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| Keywords: | capacitors energy storage microporous materials pumpkin renewable resources |
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