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Title: Time-dependent density functional theory for the charging kinetics of electric double layer containing room-temperature ionic liquids

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4968037· OSTI ID:1340469
 [1];  [1];  [1];  [2]
  1. East China Univ. of Science and Technology, Shanghai (China). School of Chemistry and Molecular Engineering. State Key Lab. of Chemical Engineering
  2. Univ. of California, Riverside, CA (United States). Dept. of Chemical and Environmental Engineering

Understanding the charging kinetics of electric double layers is of fundamental importance for the design and development of novel electrochemical devices such as supercapacitors and field-effect transistors. In this paper, we study the dynamic behavior of room-temperature ionic liquids using a classical time-dependent density functional theory that accounts for the molecular excluded volume effects, the electrostatic correlations, and the dispersion forces. While the conventional models predict a monotonic increase of the surface charge with time upon application of an electrode voltage, our results show that dispersion between ions results in a non-monotonic increase of the surface charge with the duration of charging. Finally and furthermore, we investigate the effects of van der Waals attraction between electrode/ionic-liquid interactions on the charging processes.

Research Organization:
Univ. of California, Riverside, CA (United States); East China Univ. of Science and Technology, Shanghai (China); Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); 111 Project of China; Chinese Scholarship Council
Grant/Contract Number:
AC05-00OR22725; 91334203; B08021; AC02-05CH11231
OSTI ID:
1340469
Alternate ID(s):
OSTI ID: 1333764
Journal Information:
Journal of Chemical Physics, Vol. 145, Issue 20; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Lattice model of ionic liquid confined by metal electrodes journal May 2018
Effect of an external electric field on the dynamics and intramolecular structures of ions in an ionic liquid journal October 2019