Ionic Liquid Mixture Expands the Potential Window and Capacitance of a Supercapacitor in Tandem

Lian, Cheng; Liu, Honglai; Wu, Jianzhong

doi:10.1021/acs.jpcc.8b05148

Title: Ionic Liquid Mixture Expands the Potential Window and Capacitance of a Supercapacitor in Tandem

Journal Article · Wed Jul 18 00:00:00 EDT 2018 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.8b05148· OSTI ID:1495968

Lian, Cheng ^[1];

^[1];

^[2]

East China Normal Univ. (ECNU), Shanghai (China). State Key Lab. of Chemical Engineering and School of Chemistry and Molecular Engineering
Univ. of California, Riverside, CA (United States). Dept. of Chemical and Environmental Engineering

Mixing room temperature ionic liquids (RTIL) may optimize electrolyte properties for the better performance of electrical double layer capacitors (EDLCs). To understand the composition effects, we theoretically investigate the potential window, interfacial structure, capacitance, and energy density of RTIL mixtures consisting of one common cation and two anions of different sizes. A combination of quantum density functional theory (QDFT) and classical density functional theory (CDFT) calculations indicates that the electrolyte composition has significant effects on the EDL structure and potential of zero charge, thereby altering the integral capacitance and electrochemical potential window. The two quantities can be optimized together to achieve the best EDLC performance.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1495968

Journal Information:: Journal of Physical Chemistry. C, Vol. 122, Issue 32; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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