期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 818, 期 -, 页码 51-57出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2018.04.031
关键词
Hierarchical porous carbon; Zinc chloride activation; Organic electrolyte; High energy density; Supercapacitor
资金
- Key Discipline of Materials Physics and Chemistry of Zhejiang Province [ZC323015011, ZC323014011]
- National Natural Science Foundation of China [21475118]
Three-dimensional freestanding hierarchical porous carbon materials with high specific surface areas (up to 1688 m(2) g(-1)) were prepared by the one-step carbonization of sucrose and zinc chloride (ZnCl2), defined as SCs for simplicity. Herein, ZnO particles served as the etchant and template to produce micropores and mesopores. The formation mechanism, morphology and structure were investigated by a series of techniques. The SCs exhibited highly enhanced electrochemical performances as supercapacitors, and the one synthesized at 800 degrees C (SC-800) showed high specific capacitances of 130 F g(-1) and 124 F g(-1) at the current densities of 1 and 20 A g(-1) in 1 M TEABF(4)/AN, respectively. This device delivered the high energy density of 55 Wh kg(-1) to afford the power density of 2.5 kW kg(-1) (voltage range of 3 V) and good cycling stability (85% capacitance retention after 10,000 cycles).
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