期刊
ELECTROCHIMICA ACTA
卷 360, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.137022
关键词
N,O, P co-doped; Hierarchical porous carbon; High areal capacitance; Molten-salt method; Supercapacitors
资金
- National Natural Science Foundation of China [NSFC 51907110, 51877216]
- Natural Science Foundation of Shandong Province [ZR2017JL014]
- Opening Fund of State Key Laboratory of Heavy Oil Processing [SKLOP202002004]
N, O, P co-doped hierarchical porous carbons (HPCs) have been produced by direct pyrolysis of biomass (soybean meal) and NaH2PO4 via a molten-salt method under air atmosphere without further activation process. Systematic characterizations show that obtained HPCs possess interconnected honeycomb-like macropores, together with numerous meso- and micropores. The Brunner-Emmet-Teller specific surface area for the obtained HPCs can reach up to 483 m(2) g(-1). Moreover, such a preparation method leads to a successful heteroatom-doping of N, O and P. Intensive electrochemical measurements of HPCs in 1M H-2 SO4 electrolyte shows that HPCs possess a high specific capacitance of 360 F g(-1) at a current density of 0.2 A g(-1), corresponding to an areal specific capacitance of 75 mu F cm(-2). A supercapacitor assembled with two identical HPC-750 electrodes can achieve a maximum energy density of 10Wh kg(-1). The good supercapacitive performance could be attributed to the interconnected porosity and heteroatoms doping for HPCs. (C) 2020 Elsevier Ltd. All rights reserved.
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