Charge transport in nonstoichiometric 2-fluoropyridinium triflate protic ionic liquids
(2019) In Journal of Physical Chemistry C 123(38). p.23427-23432- Abstract
- Pyridinium triflate protic ionic liquids have been demonstrated to be highly dissociated, and nonstoichiometric compositions have been used in protic energy devices such as the all-organic proton battery. Herein, we use a combination of pulsed field gradient NMR spectroscopy and electrochemical impedance spectroscopy to investigate the charge transport properties of the nonstoichiometric protic ionic liquid 2-fluoropyridinium triflate and the variation with acid doping level. While all diffusion coefficients decreased with the amount of acid doping, the room temperature conductivity increased due to the concurrent increase in charge carrier concentration. The maximum room temperature conductivity was 7.33 mS/cm, obtained when 14% of the... (More)
- Pyridinium triflate protic ionic liquids have been demonstrated to be highly dissociated, and nonstoichiometric compositions have been used in protic energy devices such as the all-organic proton battery. Herein, we use a combination of pulsed field gradient NMR spectroscopy and electrochemical impedance spectroscopy to investigate the charge transport properties of the nonstoichiometric protic ionic liquid 2-fluoropyridinium triflate and the variation with acid doping level. While all diffusion coefficients decreased with the amount of acid doping, the room temperature conductivity increased due to the concurrent increase in charge carrier concentration. The maximum room temperature conductivity was 7.33 mS/cm, obtained when 14% of the pyridine was protonated with triflic acid, while higher acid doping levels lead to liquid/solid mixtures with low conductivity. PEDOT supercapacitor cells with this electrolyte demonstrated very high capacitance (83.9 F/g) and charge storage capacity (23.3 mAh/g). In addition we predict that using a lower acid doping level than previously will result in superior electrolyte performance in proton batteries due to improvements in conductivity, processability and electrochemical stability. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/61262395-160c-497b-8932-d9b68dc87744
- author
- Jannasch, Patric LU ; Rehmen, Junaiz ; Evans, Drew and Karlsson, Christoffer LU
- organization
- publishing date
- 2019
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Physical Chemistry C
- volume
- 123
- issue
- 38
- pages
- 23427 - 23432
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:85073004174
- ISSN
- 1932-7447
- DOI
- 10.1021/acs.jpcc.9b07923
- language
- English
- LU publication?
- yes
- id
- 61262395-160c-497b-8932-d9b68dc87744
- date added to LUP
- 2019-09-02 16:50:08
- date last changed
- 2022-04-26 05:16:56
@article{61262395-160c-497b-8932-d9b68dc87744, abstract = {{Pyridinium triflate protic ionic liquids have been demonstrated to be highly dissociated, and nonstoichiometric compositions have been used in protic energy devices such as the all-organic proton battery. Herein, we use a combination of pulsed field gradient NMR spectroscopy and electrochemical impedance spectroscopy to investigate the charge transport properties of the nonstoichiometric protic ionic liquid 2-fluoropyridinium triflate and the variation with acid doping level. While all diffusion coefficients decreased with the amount of acid doping, the room temperature conductivity increased due to the concurrent increase in charge carrier concentration. The maximum room temperature conductivity was 7.33 mS/cm, obtained when 14% of the pyridine was protonated with triflic acid, while higher acid doping levels lead to liquid/solid mixtures with low conductivity. PEDOT supercapacitor cells with this electrolyte demonstrated very high capacitance (83.9 F/g) and charge storage capacity (23.3 mAh/g). In addition we predict that using a lower acid doping level than previously will result in superior electrolyte performance in proton batteries due to improvements in conductivity, processability and electrochemical stability.}}, author = {{Jannasch, Patric and Rehmen, Junaiz and Evans, Drew and Karlsson, Christoffer}}, issn = {{1932-7447}}, language = {{eng}}, number = {{38}}, pages = {{23427--23432}}, publisher = {{The American Chemical Society (ACS)}}, series = {{Journal of Physical Chemistry C}}, title = {{Charge transport in nonstoichiometric 2-fluoropyridinium triflate protic ionic liquids}}, url = {{http://dx.doi.org/10.1021/acs.jpcc.9b07923}}, doi = {{10.1021/acs.jpcc.9b07923}}, volume = {{123}}, year = {{2019}}, }