期刊
ENERGY STORAGE MATERIALS
卷 12, 期 -, 页码 183-190出版社
ELSEVIER
DOI: 10.1016/j.ensm.2017.12.008
关键词
Electrical double layer capacitors; Porous carbons; Nuclear magnetic resonance spectroscopy
资金
- Federal Ministry of Education and Research (Bundesministerium fur Bildung und Forschung, BMBF) within the Mechanocarb project [03SF0498]
- Deutsche Forschungsgemeinschaft [Br 1278/29-1, KA-1698/27-1]
Electrical double layer capacitors are in the special focus of current energy storage research due to their high power density. They store charge physically by quick electrosorption of electrolyte ions on the surface of porous carbon electrodes. However, fundamental insight into the storage mechanism, especially on a molecular level is limited despite of the crucial importance to understand and improve this promising technology. We have investigated and quantified the mobility of electrolyte ions in supercapacitor electrodes by means of solid-state nuclear magnetic resonance (NMR) spectroscopy. We could discriminate between the mobility of cations, anions, and solvent molecules. The exchange of these species between different pore systems as well as between pore system and external bulk environment is studied in detail by NMR spectroscopic methods.
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