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Title: Exploring the Use of Ionic Liquid Mixtures to Enhance the Performance of Dicationic Ionic Liquids

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.0271708jes· OSTI ID:1358033
 [1];  [2];  [3];  [3];  [3];  [4];  [5];  [6];  [6]
  1. Queensborough Community College, Bayside, NY (United States). Dept. of Chemistry
  2. Brooklyn College, Brooklyn, NY (United States). Physics Dept.
  3. Queensborough Community College of the City Univ. of New York, Bayside, NY (United States). Dept. of Chemistry
  4. Hunter College, New York, NY (United States). Dept. of Physics
  5. Univ. of Kelaniya (Sri Lanka). Dept. of Physics
  6. Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Division

Dicationic ionic liquids (DILs) of diverse structural architectures (including symmetrical and asymmetrical ammonium, phosphonium and heterodications and the bis(trifluoromethylsulfonyl)amide (NTf2-) anion) have been prepared and used as additives to N-methyl-N-ethoxyethylpyrrolidinium (P1EOE) NTf2, a relatively high-performing IL in terms of its transport properties (viscosity 53 mPa s). The three-ion, binary IL mixtures were characterized for their thermal and transport properties using differential scanning calorimetry, temperature dependent viscosity, conductivity and Pulsed Gradient Spin Echo (PGSE) NMR. Variable temperature 1H, 19F and 31P self-diffusion coefficients were determined at 25, 60 and 75°C. The order of the diffusion coefficients was D(P1EOE+) > D(anion) > D(dication), and the composition of the dication had a strong effect on the degree to which diffusion of all three species is more or less coupled. IL mixtures containing about 30 mol % of the dicationic NTf2 and 70 mol % of P1EOE NTf2 resulted in a significant decrease in glass transition temperatures and viscosities compared to the pure DIL. The mixtures extended the liquid range and potential for practical applications significantly. Finally, the data obtained here provides insight into the future design of dicationic salts tailored to exhibit lower viscosity and higher conductivities.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Queensborough Community College, Bayside, NY (United States); Hunter College, New York, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS); National Science Foundation (NSF); National Inst. of Health (NIH) (United States); Staff Congress of the City Univ. of New York (PSC-CUNY) (United States)
Contributing Organization:
Brooklyn College, Brooklyn, NY (United States); Univ. of Kelaniya (Sri Lanka)
Grant/Contract Number:
SC0012704; 68132-00 46
OSTI ID:
1358033
Report Number(s):
BNL-113883-2017-JA; R&D Project: CO-004; KC0301010
Journal Information:
Journal of the Electrochemical Society, Vol. 164, Issue 8; ISSN 0013-4651
Publisher:
The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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Structure and properties of new dicationic ionic liquid DBTMEDA(BF4)2 journal December 2018

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