期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 26, 页码 15801-15811出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta02690h
关键词
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资金
- National Natural Science Foundation of China [21875165, 51772216, 21501135, 21703161]
- Science and Technology Commission of Shanghai Municipality, China [14DZ2261100]
- Fundamental Research Funds for the Central Universities
The key concern in constructing high-energy supercapacitors is maximizing the electrode capacitance and the cell voltage. However, the current research usually addresses this issue by designing advanced electrodes or seeking high-potential electrolytes separately, instead of both. Herein, we demonstrate a two-pronged design of ternary-doped carbon electrodes and a high-voltage water-in-salt (WIS) gel electrolyte to support advanced aqueous-based solid-state supercapacitors. The fabrication of N/S/O multidoped carbons is quite straightforward, involving a facile benzoquinone/sulfourea polymerization and a common carbonization/activation procedure, which avoid sophisticated technique/conditions and/or time-consuming synthetic routes. The carbons feature an extraordinary surface area, high content of heteroatoms, and improved surface wettability. A highly porous gel polymer is introduced as a supporting matrix for the WIS to design a 2.3 V gel-type electrolyte, in pursuit of a new record high-energy aqueous solid-state supercapacitor of 37.7 W h kg(-1), with excellent temperature robustness in the range of 0-80 degrees C. Furthermore, an assembled flexible device delivers a stable energy output of 34.3 W h kg(-1) and demonstrates great flexibility with 91.6% energy retention even in a bending state of 180 degrees. This study presents an electrode/electrolyte cooperative effect to unlock the energy potential of aqueous flexible solid-state supercapacitors.
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