InSitu FTIR Spectroscopy: Probing the Electrochemical Interface during the Oxygen Reduction Reaction on a Commercial Platinum High-Surface-Area Catalyst

Nesselberger, M.; Arenz, Matthias (2016). InSitu FTIR Spectroscopy: Probing the Electrochemical Interface during the Oxygen Reduction Reaction on a Commercial Platinum High-Surface-Area Catalyst. ChemCatChem, 8(6), pp. 1125-1131. WILEY-VCH 10.1002/cctc.201501193

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Insitu observation of anion adsorption on industrial high-surface-area catalysts is used for the first time under oxygen reduction reaction (ORR) conditions with a defined mass transport. For this purpose, a specially fabricated electrode is used for which the catalyst layer is spray-coated on top of a structured Au contact layer and applied to our recently developed insitu attenuated total reflectance FTIR wall-jet electrode. The designed interface allows us to track anion adsorption and measure the reaction rate simultaneously under mass controlled conditions. The observed absorption bands are caused by anion interaction with the active phase and also the carbon support. If we analyze the absorption band intensity of adsorbed anions as a function of the oxygen reduction reaction rate, the band intensity decreases with the onset of the ORR. This shows that ORR inhibition is a complex interplay between site blocking caused by anion adsorption and oxide formation.

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:

1867-3880

Publisher:

WILEY-VCH

Language:

English

Submitter:

Matthias Arenz

Date Deposited:

17 Nov 2016 16:28

Last Modified:

19 Feb 2017 02:30

Publisher DOI:

10.1002/cctc.201501193

Web of Science ID:

000373074900017

Uncontrolled Keywords:

electrochemistry fuel cells ir spectroscopy platinum supported catalysts infrared-absorption spectroscopy fuel-cell sulfate adsorption adsorbed sulfate ir spectroscopy particle-size atr-ftiras electrodes carbon acid

BORIS DOI:

10.7892/boris.89894

URI:

https://boris.unibe.ch/id/eprint/89894

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