Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 138, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4799886
Keywords
-
Funding
- (U.S.) Department of Energy (DOE) [DE-FG02-06ER46296]
- Adam Mickiewicz University, Faculty of Chemistry
Ask authors/readers for more resources
The differential capacitance curve for the double layer formed by an electrolyte dissolved in a solvent is commonly believed to be parabolic-like with a minimum at low electrolyte charge concentration and low electrode surface charge density, and independent of electrolyte concentration at high electrolyte concentrations and high electrode charge and would be, in the absence of solvent effects, featureless at these latter conditions. This is the prediction of the popular Gouy-Chapman-Stern theory. In contrast, for an ionic liquid this curve can have a single or a double hump (or a bell or camel shape). Fedorov et al. [Electrochem. Commun. 12, 296 (2010)] have related these humps, particularly the double hump, to the neutral tails of ions in many ionic liquids. Evidence presented here shows, however, that such humps are general features of the differential capacitance of a double layer, whether it be formed by ions with or without a neutral tail. The presence of a double or single hump results from the magnitude of the electrolyte charge concentration. For both spherical ions or non-spherical ions consisting of charged heads and neutral tails, the shape of the differential capacitance transforms continuously from a double hump to a single hump as the electrolyte concentration is increased. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4799886]
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available