Parameters determining dimensional changes of porous carbons during capacitive charging
| Autor: | M.M. Hantel, D. Weingarth, Rüdiger Kötz |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Capacitive sensing Inorganic chemistry chemistry.chemical_element 02 engineering and technology General Chemistry Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 7. Clean energy 01 natural sciences 0104 chemical sciences Solvent chemistry.chemical_compound Porous carbon chemistry Chemical engineering Propylene carbonate Ionic liquid General Materials Science 0210 nano-technology Acetonitrile Carbon |
| Zdroj: | Carbon |
| DOI: | 10.1016/j.carbon.2013.12.026 |
| Popis: | The expansion of porous carbons used in electrochemical double layer capacitors during positive or negative charging has been investigated in several studies, however, the underlying mechanisms are not well understood yet. We therefore investigated dimensional changes of three different carbons in various electrolytes including ionic liquids e.g. [EMIM][BF4] with and without solvent and [EMIM][TFSI]. For all carbon/electrolyte combinations the expansion during positive charging was smaller than for negative charging. The expansion increased with decreasing average pore size of the carbon. Addition of solvents, such as acetonitrile or propylene carbonate, significantly increased the expansion for negative charging. These observations are discussed in the view of various existing models for charge induced strain of carbons. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|