Comparison of Oxygen Adsorption and Platinum Dissolution in Acid and Alkaline Solutions Using Electrochemical Quartz Crystal Microbalance
Artikel i vetenskaplig tidskrift, 2022

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.

Electrochemistry

Platinum

Platinum oxide growth

Electrochemical quartz-crystal microbalance

Platinum dissolution

Författare

Linnéa Strandberg

Chalmers, Fysik, Kemisk fysik

Victor Shokhen

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Mathilde Luneau

Chalmers, Fysik, Kemisk fysik

Göran Lindbergh

Kungliga Tekniska Högskolan (KTH)

C. Lagergren

Kungliga Tekniska Högskolan (KTH)

Björn Wickman

Chalmers, Fysik, Kemisk fysik

ChemElectroChem

2196-0216 (eISSN)

Vol. 9 22 e202200591

Nya material för bränslecellskatalysatorer med nanostrukturerade modelelektroder

Vetenskapsrådet (VR) (2018-03927), 2019-01-01 -- 2022-12-31.

Ämneskategorier

Oorganisk kemi

Materialkemi

Annan kemi

DOI

10.1002/celc.202200591

Mer information

Senast uppdaterat

2024-03-07