Nonstoichiometric triazolium protic ionic liquids for all-organic batteries
Karlsson, Christoffer LU ; Strietzel, Christian ; Huang, Hao ; Sjödin, Martin and Jannasch, Patric LU
(2018)
In ACS Applied Energy Materials
1(11).
p.6451-6462
- Abstract
- Non stoichiometric protic ionic liquids (NSPILs) are efficient electrolytes for protic electrochemical devices such as the all-organic proton battery, which has been suggested as a sustainable approach to energy storage. NSPILs contain a mixture of proton donors and acceptors and are ideal for this purpose due to their high proton conductivity, high electrochemical stability, low cost and ease of synthesis. The electrolyte proton activity must be controlled carefully in these devices since it greatly influences the kinetics and energetics of the electrode redox reactions, and hence also impacts battery device performance. In this study, specific NSPILs were designed and evaluated as electrolytes for the all-organic proton battery. The... (More)
- Non stoichiometric protic ionic liquids (NSPILs) are efficient electrolytes for protic electrochemical devices such as the all-organic proton battery, which has been suggested as a sustainable approach to energy storage. NSPILs contain a mixture of proton donors and acceptors and are ideal for this purpose due to their high proton conductivity, high electrochemical stability, low cost and ease of synthesis. The electrolyte proton activity must be controlled carefully in these devices since it greatly influences the kinetics and energetics of the electrode redox reactions, and hence also impacts battery device performance. In this study, specific NSPILs were designed and evaluated as electrolytes for the all-organic proton battery. The NSPILs were based on either 1,2,4-triazole or 1-methyl-1,2,4-triazole partially protonated with bis(trifluoromethylsulfonyl)imide (TFSI) to produce a range of NSPILs with different degrees of protonation. Both types of NSPIL investigated here exhibit a maximum observed conductivity of 1.2 S/cm (at 120 and 70 °C, respectively), and the eutectic composition of 1-methyl-1,2,4-triazolium TFSI also has high conductivity at 25 °C (24.9 mS/cm), superior to e.g. imidazolium TFSI NSPILs. Pulsed field gradient NMR in conjunction with electrochemical impedance spectroscopy showed that the conductivity originated mainly from vehicle diffusion and proton hopping. Quinone functionalized poly(3,4-ethylenedioxythiophene) (PEDOT) electrodes exhibited reversible, fast and stable redox conversion in these electrolytes, and a model is suggested to determine proton activities of NSPILs based on the quinone formal potential. An all-organic proton battery cell was assembled to demonstrate the usefulness of these electrolytes in devices. Fast and complete redox conversion with a cell potential of 0.45 V was demonstrated, even up to scan rates corresponding to 140 C. Compared to the pyridine based electrolytes used for the all-organic proton battery up until now, the present electrolytes display several advantages including lower melting point, lower toxicity, and compatibility with plastic materials. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/dbf15199-08d1-4d59-82cf-3dfbfddbf9b3
- author
- Karlsson, Christoffer
LU
; Strietzel, Christian
; Huang, Hao
; Sjödin, Martin
and Jannasch, Patric
LU
- organization
- publishing date
- 2018
- type
- Contribution to journal
- publication status
- published
- subject
- in
- ACS Applied Energy Materials
- volume
- 1
- issue
- 11
- pages
- 12 pages
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:85064845606
- ISSN
- 2574-0962
- DOI
- 10.1021/acsaem.8b01389
- language
- English
- LU publication?
- yes
- additional info
- Publication Date (Web): October 23, 2018
- id
- dbf15199-08d1-4d59-82cf-3dfbfddbf9b3
- date added to LUP
- 2018-10-24 10:23:31
- date last changed
- 2022-04-17 23:44:24
@article{dbf15199-08d1-4d59-82cf-3dfbfddbf9b3,
abstract = {{Non stoichiometric protic ionic liquids (NSPILs) are efficient electrolytes for protic electrochemical devices such as the all-organic proton battery, which has been suggested as a sustainable approach to energy storage. NSPILs contain a mixture of proton donors and acceptors and are ideal for this purpose due to their high proton conductivity, high electrochemical stability, low cost and ease of synthesis. The electrolyte proton activity must be controlled carefully in these devices since it greatly influences the kinetics and energetics of the electrode redox reactions, and hence also impacts battery device performance. In this study, specific NSPILs were designed and evaluated as electrolytes for the all-organic proton battery. The NSPILs were based on either 1,2,4-triazole or 1-methyl-1,2,4-triazole partially protonated with bis(trifluoromethylsulfonyl)imide (TFSI) to produce a range of NSPILs with different degrees of protonation. Both types of NSPIL investigated here exhibit a maximum observed conductivity of 1.2 S/cm (at 120 and 70 °C, respectively), and the eutectic composition of 1-methyl-1,2,4-triazolium TFSI also has high conductivity at 25 °C (24.9 mS/cm), superior to e.g. imidazolium TFSI NSPILs. Pulsed field gradient NMR in conjunction with electrochemical impedance spectroscopy showed that the conductivity originated mainly from vehicle diffusion and proton hopping. Quinone functionalized poly(3,4-ethylenedioxythiophene) (PEDOT) electrodes exhibited reversible, fast and stable redox conversion in these electrolytes, and a model is suggested to determine proton activities of NSPILs based on the quinone formal potential. An all-organic proton battery cell was assembled to demonstrate the usefulness of these electrolytes in devices. Fast and complete redox conversion with a cell potential of 0.45 V was demonstrated, even up to scan rates corresponding to 140 C. Compared to the pyridine based electrolytes used for the all-organic proton battery up until now, the present electrolytes display several advantages including lower melting point, lower toxicity, and compatibility with plastic materials.}},
author = {{Karlsson, Christoffer and Strietzel, Christian and Huang, Hao and Sjödin, Martin and Jannasch, Patric}},
issn = {{2574-0962}},
language = {{eng}},
number = {{11}},
pages = {{6451--6462}},
publisher = {{The American Chemical Society (ACS)}},
series = {{ACS Applied Energy Materials}},
title = {{Nonstoichiometric triazolium protic ionic liquids for all-organic batteries}},
url = {{http://dx.doi.org/10.1021/acsaem.8b01389}},
doi = {{10.1021/acsaem.8b01389}},
volume = {{1}},
year = {{2018}},
}