Double-Layer Capacitances Caused by Ion–Solvent Interaction in the Form of Langmuir-Typed Concentration Dependence

Material type: 文書・図像類

Author: Aoki , Koichi Jeremiahほか

Publisher: MDPI

Publication date: 2021-11-18

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Note (General)：: Variations of the double layer capacitances (DLCs) at a platinum electrode with concentrations and kinds of salts in aqueous solutions were examined i...

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Material Type: 文書・図像類
Title: Double-Layer Capacitances Caused by Ion–Solvent Interaction in the Form of Langmuir-Typed Concentration Dependence
Author/Editor: Aoki , Koichi Jeremiah
He , Ridong
Chen , Jingyuan
Author Heading: Aoki , Koichi Jeremiah
He , Ridong
Chen , Jingyuan
Publication, Distribution, etc.: MDPI
Publication Date: 2021-11-18
Publication Date (W3CDTF): 2021-11-18
Alternative Title: Double-Layer Capacitances Caused by Ion–Solvent Interaction in the Form of Langmuir-Typed Concentration Dependence
Periodical title: Electrochem
No. or year of volume/issue: 2 4
Volume: 2
Issue: 4
Pages: 631-642
ISSN (Periodical Title): ISSN : 2673-3293
Text Language Code: eng
Subject Heading: variation of capacitance with salt concentrations
destroyed hydrogen bonds by salts
relation of capacitance with viscosity
grand canonical ensemble
Target Audience: 一般
Note (General): Variations of the double layer capacitances (DLCs) at a platinum electrode with concentrations and kinds of salts in aqueous solutions were examined in the context of facilitating orientation of solvent dipoles. With an increase in ionic concentrations, the DLCs increased by ca. a half and then kept constant at concentrations over 1 mol dm−3. This increase was classically explained in terms of the Gouy–Chapman (GC) equation combined with the Stern model. Unfortunately, measured DLCs were neither satisfied with the Stern model nor the GC theory. Our model suggests that salts destroy hydrogen bonds at the electrode–solution interface to orient water dipoles toward the external electric field. A degree of the orientation depends on the interaction energy between the salt ion and a water dipole. The statistical mechanic calculation allowed us to derive an equation for the DLC as a function of salt concentration and the interaction energy. The equation took the Langmuir-type in the relation with the concentration. The interaction energy was obtained for eight kinds of salts. The energy showed a linear relation with the interaction energy of ion–solvent for viscosity, called the B-coefficient. View Full-Text
source:https://www.mdpi.com/2673-3293/2/4/39
Access Restrictions: 限定公開
Rights (production): cc-by
Related Material (DOI): 10.3390/electrochem2040039
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 福井大学 : 福井大学学術機関リポジトリ