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Reduction of oxygen in a trialkoxy ammonium-based ionic liquid and the role of water

Version 2 2024-06-05, 10:42
Version 1 2016-04-27, 15:20
journal contribution
posted on 2024-06-05, 10:42 authored by Cristina Pozo-GonzaloCristina Pozo-Gonzalo, Mega KarMega Kar, E Jónsson, Patrick HowlettPatrick Howlett, DR MacFarlane, Maria ForsythMaria Forsyth
The oxygen reduction reaction in a novel trialkoxy ammonium-based ionic liquid, N-ethyl-2-(2-methoxyethoxy)-N,N-bis(2-(2-methoxyethoxy)ethyl)ethan-1-aminium bis(trifluoromethylsulfonyl)imide, [N2(20201)(20201)(20201)] [NTf2] has been studied on glassy carbon and gold electrodes, showing faster electrokinetics on glass carbon because of weaker adsorption of the IL. This has been demonstrated by theoretical calculations and electrochemical studies. In the neat IL, the oxygen is reduced to superoxide (O2 -) through a one electron process; however, better performance is attained in the presence of water (42 mol%), in terms of current density, and onset potential of the reduction process via a reversible 2-electron process. Furthermore, a remarkable increase in cyclic coulombic efficiency is observed for the wet IL (66% in comparison with the neat IL (24%), showing the practicality of a reversible O2/H2O2 system for energy storage.

History

Journal

Electrochimica Acta

Volume

196

Pagination

727-734

Location

Amsterdam, The Netherlands

ISSN

0013-4686

eISSN

1873-3859

Language

English

Publication classification

C Journal article, C1 Refereed article in a scholarly journal

Copyright notice

2016, Elsevier

Publisher

PERGAMON-ELSEVIER SCIENCE LTD