期刊
ELECTROCHIMICA ACTA
卷 323, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.134811
关键词
Carbon aerogel; Heteroatom-doping; Hierarchical pore; Supercapacitor
资金
- National Natural Science Foundation of China [21704014, 21674019]
- Fundamental Research Funds for the Central Universities [2232017D-06, 2232019A3-03]
- Shanghai Sailing Program [17YF1400200]
- Program of Shanghai Academic Research Leader [17XD1400100]
- Shanghai Municipal Education Commission [17CG33]
- Ministry of Education of the People's Republic of China [6141A0202202]
Designing porous structure and surface properties of carbon electrodes is the key premise for efficient electron/ion transfer, which is crucial for improving electrochemical performance of supercapacitors in practical applications. Herein, N-doped activated carbon aerogel (NACA) with hierarchical porous structure and N, O-rich functionalities has been prepared from polyimide gel by activation and carbonization process. The NACA exhibits a high surface area of 1410 m(2) g(-1) with hierarchical porous structures, with both high micropore volume (0.481 cc g(-1)) and mesopore volume (0.566 cc g(-1)) as well as high heteroatom content, which is favorable for charge storage, ion transfer and electrolyte penetration. As a result, the NACA2-11 can deliver a high capacitance of 386 F g(-1) at 1 A g(-1) in a three-electrode system and outstanding rate performance with the capacitance retaining 150 F g(-1) at 100 A g(-1) in aqueous electrolyte. Furthermore, the practical two-electrode device exhibits a high areal specific capacitance of 1584 mF cm(-2) under the commercial level mass loading of 10 mg cm(-2), and it stays a good cycling stability of 93% capacitance retention after 10000 cycles at 5 A g(-1). This study paves the way for improving electrochemical performance of carbon-based supercapacitor under high mass loadings. (C) 2019 Elsevier Ltd. All rights reserved.
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