Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 614, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2021.126172
Keywords
Hierarchical porous carbon; Moltensalt; Template; Supercapacitors
Categories
Funding
- Anhui Provincial Natural Science Foundation [1808085ME138]
- Natural Science Foundation of AnHui Provincial Education Department [KJ2019A0075]
- Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (Anhui University of Technology), Ministry of Education [JKF19-02]
- Support Program for Outstanding Young Talents in colleges and Universities in Anhui Province [gxyq2020009]
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In this study, N/S co-doped hierarchical porous carbons were prepared using a novel method and exhibited excellent electrochemical performance in double-layer supercapacitors. The obtained carbons showed well-developed structure and composition, facilitating charge transport and exposure of surface active sites.
To enrich the type of carbons for double-layer supercapacitors and optimize their electrochemical performances, N/S co-doped hierarchical porous carbons (KISPCs) with well-balanced pore characteristic have been prepared by taking ginkgo leaf as carbon source and KCl/K2CO3 molten-salt as template/activation agent. The as-obtained carbons possess a well-developed interconnected sheet-like structure, accompanying with high N, S and O contents, conductive to abundant ions transport channels and exposure of more ions-accessible active sites. Moreover, the types and contents of surface functional groups of hierarchical porous carbon could also be adjusted by K2CO3 content. A symmetrical supercapacitor was assembled to validate its electrochemical performance. The KISPCs electrodes manifest a specific capacitance of 215.2 F g(-1) at 0.05 A g(-1), splendid capacitance retention of 78.9 % (169.8 F g(-1) at 20 A g(-1)) and exceptional cycling stability with only 1.6 % capacity decay after 10000 charge/discharge cycles. This work can afford promising new tactics for the preparation of hierarchical porous carbon nanosheets and offer insights into the application of energy storage fields.
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