Comparison of Oxygen Adsorption and Platinum Dissolution in Acid and Alkaline Solutions Using Electrochemical Quartz Crystal Microbalance

Linnéa Strandberg, Victor Shokhen, Mathilde Luneau, Göran Lindbergh, Carina Lagergren, Björn Wickman

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Platinum (Pt) is a widely used electrocatalyst material in fuel cells and electrolysers. Proton exchange membrane (PEM) fuel cells and electrolysis operate under highly acidic conditions whereas the more recently developed anion exchange membrane (AEM) processes take place under alkaline conditions. Pt dissolution and Pt oxidation during operation and varying potentials has been studied mainly for the acidic PEM and less for the alkaline AEM. This study presents a comparison of Pt dissolution and Pt oxidation in 0.5 M H2SO4 and 1 M KOH using electrochemical quartz crystal microbalance (EQCM) on Pt thin films. Physical characterisation using electron microscopy and atomic force microscopy (AFM) revealed small, yet significant differences in the Pt film surface structure, which is related to differences in measured electrochemical surface area (ECSA). The mass increase from adsorption of oxygenated species and Pt oxidation is higher in alkaline conditions compared to in acid while dissolution of Pt is similar.

Original languageEnglish
Article numbere202200591
JournalChemElectroChem
Volume9
Issue number22
DOIs
StatePublished - 25 Nov 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2022 The Authors. ChemElectroChem published by Wiley-VCH GmbH.

Funding

This project is financially supported by the Swedish Foundation for Strategic Research (Project No. ARC19‐0026), and by the Swedish Research Council (Project No. 2018‐03927). This work was performed in part at Myfab Chalmers and the Chalmers Material Analysis Laboratory, CMAL. The Competence Centre for Catalysis is hosted by Chalmers University of Technology and financially supported by the Swedish Energy Agency and the member companies ECAPS, Johnson Matthey, Perstorp, PowerCell, Preem, Scania CV, Umicore and Volvo Group. This project is financially supported by the Swedish Foundation for Strategic Research (Project No. ARC19-0026), and by the Swedish Research Council (Project No. 2018-03927). This work was performed in part at Myfab Chalmers and the Chalmers Material Analysis Laboratory, CMAL. The Competence Centre for Catalysis is hosted by Chalmers University of Technology and financially supported by the Swedish Energy Agency and the member companies ECAPS, Johnson Matthey, Perstorp, PowerCell, Preem, Scania CV, Umicore and Volvo Group.

FundersFunder number
CMAL
Chalmers Material Analysis Laboratory
Myfab Chalmers
Umicore and Volvo Group
Stiftelsen för Strategisk ForskningARC19‐0026
Vetenskapsrådet2018‐03927
Energimyndigheten

    Keywords

    • Electrochemical quartz-crystal microbalance
    • Electrochemistry
    • Platinum
    • Platinum dissolution
    • Platinum oxide growth

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