Abstract

The effect of proton donors on the mechanism of the electrochemical oxygen reduction reaction (ORR) is examined in the supporting ionic liquid 1-butyl-2,3-dimethylimidazolium trifluoromethanesulfonate (C4dMImTf). ORR in aqueous media is contrasted with that in aprotic media and in aprotic ionic liquid (IL) systems with the addition of protic species. This study elucidates the effect of proton activity encompassing almost thirty orders of magnitude for both platinum (Pt) and glassy carbon (GC) electrodes. In neat aprotic C4dMImTf for both platinum and glassy carbon electrodes, ORR proceeds entirely through a one electron process as expected. In ILs with protic additives, ORR approaches a four-electron pathway regardless of the identity of the protic additive on Pt, whereas ORR on GC is limited to a two-electron process due to a lack of H ads and Oads species.

Original languageEnglish (US)
Pages (from-to)8683-8690
Number of pages8
JournalJournal of Physical Chemistry C
Volume117
Issue number17
DOIs
StatePublished - May 2 2013

Fingerprint

Ionic Liquids
Ionic liquids
Oxygen
glassy carbon
Glassy carbon
Platinum
oxygen
liquids
platinum
Electrons
Protons
Electrodes
electrons
electrodes
protons
carbon

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Oxygen reduction reaction in ionic liquids : The addition of protic species. / Switzer, Elise E.; Zeller, Robert; Chen, Qing; Sieradzki, Karl; Buttry, Daniel; Friesen, Cody.

In: Journal of Physical Chemistry C, Vol. 117, No. 17, 02.05.2013, p. 8683-8690.

Research output: Contribution to journalArticle

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AU - Switzer, Elise E.

AU - Zeller, Robert

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AU - Sieradzki, Karl

AU - Buttry, Daniel

AU - Friesen, Cody

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AB - The effect of proton donors on the mechanism of the electrochemical oxygen reduction reaction (ORR) is examined in the supporting ionic liquid 1-butyl-2,3-dimethylimidazolium trifluoromethanesulfonate (C4dMImTf). ORR in aqueous media is contrasted with that in aprotic media and in aprotic ionic liquid (IL) systems with the addition of protic species. This study elucidates the effect of proton activity encompassing almost thirty orders of magnitude for both platinum (Pt) and glassy carbon (GC) electrodes. In neat aprotic C4dMImTf for both platinum and glassy carbon electrodes, ORR proceeds entirely through a one electron process as expected. In ILs with protic additives, ORR approaches a four-electron pathway regardless of the identity of the protic additive on Pt, whereas ORR on GC is limited to a two-electron process due to a lack of H ads and Oads species.

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