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Volume 206, 2018
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Amphoteric water as acid and base for protic ionic liquids and their electrochemical activity when used as fuel cell electrolytes

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Abstract

Amphoteric water was mixed with equimolar amounts of a super-strong acid, trifluoromethanesulfonic acid (TfOH), and a super-strong base, 1,8-diazabicyclo[5.4.0]-7-undecene (DBU). Bulk physicochemical and electrochemical properties of the mixtures were compared with those of the best ever reported protic ionic liquid (PIL), diethylmethylammonium trifluoromethanesulfonate ([dema][TfO]), which has excellent physicochemical properties as a fuel cell electrolyte. The acidic mixture ([H3O][TfO]) behaved as a protic ionic liquid, while the basic mixture ([DBU]OH) showed incomplete proton transfer. The Walden plot indicated that [H3O][TfO] behaves as a good PIL, similar to [dema][TfO], whereas [DBU]OH behaves as a poor PIL. [H3O][TfO] showed excellent H2/O2 fuel cell performance at 80 °C; however, the performance deteriorated as the bulk water content increased, because of the retardation of the electrode kinetics due to the oxidation of Pt in the presence of bulk water. On the other hand, [DBU]OH exhibited very poor performance possibly because of the existence of neutral species in the system.

Graphical abstract: Amphoteric water as acid and base for protic ionic liquids and their electrochemical activity when used as fuel cell electrolytes

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Article information


Submitted
13 Apr 2017
Accepted
10 May 2017
First published
10 May 2017

Faraday Discuss., 2018,206, 353-364
Article type
Paper

Amphoteric water as acid and base for protic ionic liquids and their electrochemical activity when used as fuel cell electrolytes

M. S. Miran, T. Yasuda, R. Tatara, Md. Abu Bin Hasan Susan and M. Watanabe, Faraday Discuss., 2018, 206, 353
DOI: 10.1039/C7FD00132K

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