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Title: Impurity Effects on Charging Mechanism and Energy Storage of Nanoporous Supercapacitors

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [1]; ORCiD logo [2]
  1. East China Univ. of Science and Technology, Shanghai (People's Republic of China)
  2. Univ. of California, Riverside, CA (United States)

Room-temperature ionic liquids (RTILs) have been widely used as electrolytes to enhance the capacitive performance of electrochemical capacitors also known as supercapacitors. Whereas impurities are ubiquitous in RTILs (e.g., water, alkali salts, and organic solvents), little is known about their influences on the electrochemical behavior of electrochemical devices. In this work, we investigate different impurities in RTILs within the micropores of carbon electrodes via the classical density functional theory (CDFT). We find that under certain conditions impurities can significantly change the charging behavior of electric double layers and the shape of differential capacitance curves even at very low concentrations. More interestingly, an impurity with a strong affinity to the nanopore can increase the energy density beyond a critical charging potential. As a result, our theoretical predictions provide further understanding of how impurity in RTILs affects the performance of supercapacitors.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); 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)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1399237
Journal Information:
Journal of Physical Chemistry. C, Vol. 121, Issue 26; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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Cited By (5)

Design of Supercapacitor Electrodes Using Molecular Dynamics Simulations journal January 2018
Ultrahigh energy density of a N, O codoped carbon nanosphere based all-solid-state symmetric supercapacitor journal January 2019
Water dissolution in ionic liquids between charged surfaces: effects of electric polarization and electrostatic correlation journal January 2018
Study of a water-graphene capacitor with molecular density functional theory journal September 2019
A first-principles roadmap and limits to design efficient supercapacitor electrode materials journal January 2019

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