A fluorinated ionic liquid as a high-performance fuel cell electrolyte

Jeffery Thomson, Patrick Dunn, Lisa Holmes, Jean Phillipe Belieres, C. Austen Angell, Don Gervasio

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Scopus citations

Abstract

This is the first report of a fuel cell with a proton-conducting ionic liquid (pIL) electrolyte that outperforms one with aqueous concentrated (85%) phosphoric acid over all current densities. The new pIL, 2-fluoropyridinium triflate (2-FPTf), is a fluorinated pIL that was made by mixing equimolar amounts of 2-fluoropyridine and triflic acid. A Pt-catalyzed fuel cell fed dry hydrogen and oxygen gases was stable at 80°C with neat 2-FPTf as the electrolyte. The polarization curve showed more than 15% improvement in performance (> 0.1 V cell voltage gain) compared to an identical fuel cell except with aqueous 85% phosphoric acid as the electrolyte. The stability of the fuel cell with 2-FPTf is attributed to it being a fluorinated electrolyte that does not wet Teflon. The improved fuel cell performance is attributed to low water-activity of the electrolyte leading to suppression of oxide formation on Pt and improved cathode performance. This was supported by the voltammetry of Pt in 2-FPTf electrolyte equilibrated with oxygen, which showed oxygen reduction begins near the thermodynamic limit of 1.2 V versus RHE at 80°C.

Original languageEnglish (US)
Title of host publicationECS Transactions - Proton Transfer and Transport in Fuel Cells - 213th ECS Meeting
Pages21-29
Number of pages9
Edition28
DOIs
StatePublished - Dec 1 2008
EventProton Transfer and Transport in Fuel Cells - 213th ECS Meeting - Phoenix, AZ, United States
Duration: May 18 2009May 23 2009

Publication series

NameECS Transactions
Number28
Volume13
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

OtherProton Transfer and Transport in Fuel Cells - 213th ECS Meeting
CountryUnited States
CityPhoenix, AZ
Period5/18/095/23/09

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Thomson, J., Dunn, P., Holmes, L., Belieres, J. P., Angell, C. A., & Gervasio, D. (2008). A fluorinated ionic liquid as a high-performance fuel cell electrolyte. In ECS Transactions - Proton Transfer and Transport in Fuel Cells - 213th ECS Meeting (28 ed., pp. 21-29). (ECS Transactions; Vol. 13, No. 28). https://doi.org/10.1149/1.3055403