Fundamental insight into enhanced activity of Pd/CeO2 thin films in hydrogen oxidation reaction in alkaline media
Artikel i vetenskaplig tidskrift, 2023

Palladium supported on ceria (Pd/CeO2) has recently raised strong interest as an alternative catalyst to platinum on the anode electrode in anion exchange membrane fuel cells. Herein, we provide new insight into the enhanced activity of Pd/CeO2 in hydrogen oxidation reaction (HOR) in alkaline media. Using well-defined model thin films, we show that Pd/CeO2 thin films lead to enhanced activity in HOR compared to pure Pd thin films. In situ characterization using electrochemical quartz crystal microbalance provide in-depth understanding of the role of CeO2. CeO2 leads to fundamental differences in adsorption and absorption of key reaction intermediates during HOR. In combination with characterization and theoretical calculations, Pd atoms embedded in CeO2 are shown to be present on the prepared thin films and active for hydrogen activation but are not able to bind CO during CO-stripping characterization. Finally, an estimation of the source of hydroxyl intermediates provided by CeO2 - which could be directly participating in the reaction - is presented herein. Fundamental understanding of the Pd-CeO2 interface in HOR opens new ways to reduce the amount of noble metals in alkaline fuel cells.


Mathilde Luneau

Kompetenscentrum katalys

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Linnéa Strandberg

Chalmers, Fysik, Kemisk fysik

Gerard Montserrat Siso

Chalmers, Fysik, Kemisk fysik

Victor Shokhen

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Roopathy Mohan

Chalmers, Fysik, Kemisk fysik

Henrik Grönbeck

Chalmers, Fysik, Kemisk fysik

Björn Wickman

Chalmers, Fysik, Kemisk fysik

Journal of Materials Chemistry A

20507488 (ISSN) 20507496 (eISSN)

Vol. 11 30 16370-16382

Nya material för bränslecellskatalysatorer med nanostrukturerade modelelektroder

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


Oorganisk kemi



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