Influence of the Electrode and Chaotropicity of the Electrolyte on the Oscillatory Behavior of the Electrocatalytic Oxidation of SO2

Dourado, André H. B.; Munhos, Renan L.; Varela, Hamilton; de Torresi, Susana I. Córdoba; Arenz, Matthias (2018). Influence of the Electrode and Chaotropicity of the Electrolyte on the Oscillatory Behavior of the Electrocatalytic Oxidation of SO2. Journal of physical chemistry. C, 122(2), pp. 1243-1247. American Chemical Society 10.1021/acs.jpcc.7b11460

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SO2 oxidation has been proposed as an alternative pathway for the electrochemical generation of H-2 because it requires lower potentials than water splitting and at the same time consumes an atmospheric pollutant. Theoretical predictions suggest that gold and platinum are the most active catalysts for this reaction. This work presents experimental evidence that, contrary to the predictions, SO2 oxidation starts at less positive potentials on Au electrodes (ca. 0.60 V (vs RHE)) than on Pt. It is found further that the observed current densities on Au are one order of magnitude higher than on Pt. In addition, the SO2 oxidation mechanism depends on the chemical nature of the electrolyte used: A kosmotropic anion (HSO4) results in lower currents than a chaotropic one (ClO4-), and the latter displays oscillatory reaction rates under both potentiostatic and galvanostatic regimes.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Arenz, Matthias

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

1932-7447

Publisher:

American Chemical Society

Language:

English

Submitter:

Matthias Arenz

Date Deposited:

30 Apr 2018 08:47

Last Modified:

20 Dec 2018 02:30

Publisher DOI:

10.1021/acs.jpcc.7b11460

Related URLs:

Web of Science ID:

000423140500027

Additional Information:

Notes: Ft4qt Times Cited:0 Cited References Count:26 Date: 2018

Uncontrolled Keywords:

aqueous sulfur-dioxide electrochemical oxidation gold electrodes 0.5m h2so4 electrooxidation thiosulfate platinum deposition surfaces

BORIS DOI:

10.7892/boris.111628

URI:

https://boris.unibe.ch/id/eprint/111628

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