期刊
CARBON
卷 181, 期 -, 页码 323-334出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.05.039
关键词
Porous carbon materials; Superior electrochemical performance; Supercapacitors; Capacitive deionization
资金
- Beijing Natural Science Founding [2202050]
- Beijing Institute of Technology scientific cooperation project [BITBLR2020010]
- National Natural Science Foundation of China of China [20806008]
The synergy of oxygen functional groups and intrinsic defects can enhance potassium storage and sodium capture efficiency. Modified carbon materials show significant improvements in K+ transmission capability and Na+ storage capacity through this synergistic effect.
Electrochemical potassium storage and sodium capture play a critical role in supercapacitors (SCs) and capacitive deionization (CDI). Here, we report that a synergy of oxygen functional groups and intrinsic defects can boost potassium storage and sodium capture. The ions adsorption and migration can be easily tuned by manipulating oxygen functional groups and intrinsic defects. Compared to non-template carbon material, the Defects/Oxygen-containing functional groups modified carbon material presents an approximately 20% and 28.6% improvement in K+ transmission capability and Na+ storage capacity at similar conditions, respectively. Theoretical calculations further clarify that intrinsic defects redistribute electronic configuration, increase active sites and ion adsorption capability, oxygen functional groups promote the formation of more edge-defect, enlarge interlayer space and lower ion intercalation energy, thereby synergistically promoting sodium capture and potassium storage. (C) 2021 Elsevier Ltd. All rights reserved.
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