期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 449, 期 -, 页码 130-135出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2014.11.012
关键词
Single file nanopore; Cylindrical double layer; Capacitance; Density functional theory
资金
- Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences
- Chinese Scholarship Council
The differential capacitance of a model organic electrolyte in a cylindrical pore that is so narrow that the ions can form only a single file is studied by means of density functional theory (DM. Kornyshev (2013), has studied this system and found the differential capacitance to have only a double hump shape (the socalled camel shape) whereas other geometries show this behavior only at low ionic concentrations that are typical for aqueous electrolytes. However, his calculation is rather approximate. In this DFT study we find that the double hump shape occurs only at low ionic concentrations. At high concentrations, the capacitance has only a single hump. Komyshev considers a metallic cylinder and approximately includes the contributions of electrostatic images. Electrostatic images are not easily incorporated into DFf. As a result, images are not considered in this study and the question of whether Komyshev's result is due to his approximations or images cannot be answered. Simulations to answer this question are planned. (C) 2014 Elsevier Inc. All rights reserved.
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