Journal article
Steric effects in adsorption of ions from mixed electrolytes into microporous carbon
Electrochemistry communications, v 15(1)
Feb 2012
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
With the goal to improve the capacitance in electrochemical double-layer capacitors (EDLCs) many studies on pore size/ion size relationship have been undertaken to achieve a better understanding of the charge storage mechanism in the electrochemical double-layer in confinement. A significant capacitance increase was achieved by using carbon electrodes with micropores (b1 nm), when the carbon pore size was close to the ion size. In this paper, the accessibility of narrow pores is investigated by selecting a carbon with a small pore size (b0.7 nm) and electrolyte mixtures with different ion sizes. It has been shown that the adsorption capacitance limitation observed for large cations and anions could be overcome by adding ions with a smaller effective size. This result demonstrates that the pores are accessible when their size matches the effective ion size and contradicts the surface saturation assumption; effective ion size which exceeds the pore size leads to current limitation. This work confirms that the steric effect is involved when ions are adsorbed into pores and highlights the importance of controlling ion size/pore size relationship for optimisation of the capacitive performance of EDLC devices.
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Details
- Title
- Steric effects in adsorption of ions from mixed electrolytes into microporous carbon
- Creators
- Julie Segalini - Centre interuniversitaire de recherche et d'ingenierie des matériauxEtsuro Iwama - Centre interuniversitaire de recherche et d'ingenierie des matériauxPierre-Louis Taberna - Centre interuniversitaire de recherche et d'ingenierie des matériauxYury Gogotsi - Department of Materials Science and Engineering and A. J. Drexel Nanotechnology Institute ( Philadelfia, USA)Patrice Simon - Centre interuniversitaire de recherche et d'ingenierie des matériaux
- Publication Details
- Electrochemistry communications, v 15(1)
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000300860400016
- Scopus ID
- 2-s2.0-84855662169
- Other Identifier
- 991014969757904721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Electrochemistry