Journal
ELECTROCHIMICA ACTA
Volume 405, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.139827
Keywords
Cucurbituril; Porous carbon; Ionic liquid; Ion-pore size matching; Supercapacitors
Categories
Funding
- National Natural Sci-ence Foundation of China [51972123, U1705256, 217710 6 6, 61804058]
- Cultivation Program for Postgraduate in Sci-entific Research Innovation Ability of Huaqiao University [18013081053]
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The performance of supercapacitors depends on the efficient utilization of electrode pores, which requires a matching relationship between the ion size of electrolyte and the pore size of the electrode. By designing different-sized ionic liquids as electrolytes and matching them with specific-sized porous carbon electrodes, excellent energy density can be achieved.
The performance of supercapacitors depends on largely the efficient utilization of electrode pores. Therefore, clarifying the matching relationship between the ion size of electrolyte and the pore size of electrode is very crucial to achieve high-performance supercapacitors. Herein, we design a cucurbit[8]uril-derived hierarchical porous carbon (CB8C-Y) with primary pore size of 0.88 nm and a secondary pore size of 0.5 nm as electrode, and four ionic liquids with different cation sizes are compared and utilized as electrolytes. Among ionic liquids, 1-propyl-3-methylimidazole tetrafluoroborate (PMIMBF4) possesses a cation (PMIM+) size of 0.87 nm and an anion (BF4 -) size of 0.33 nm, which just matches with the porous carbon electrode's primary pore size and a secondary pore size, respectively. The suitable ion-pore size matching enables CB8C-2//PMIMBF4//CB8C-2 supercapacitor to achieve an excellent energy density of 89.15 Wh kg(-1). The results provide a typical documentation for high-performance supercapacitor by ion-pore size matching between electrolytes and electrodes. (c) 2022 Elsevier Ltd. All rights reserved.
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