Formic acid oxidation on Pd/RuO2: does the RuO2 support enhance the electrocatalytic activity of Pd nanoparticles?

The aim of this work was to study the effect of a RuO 2 support on the activity of Pd nanoparticles for formic acid oxidation, comparing the results with those obtained for Pd/C. In contrast with reports of enhancing effects of RuO 2 for other systems, such as methanol oxidation on Pt particles, our...

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Bibliographic Details
Published in:Journal of solid state electrochemistry 2023-09, Vol.27 (9), p.2465-2477
Main Authors: Alvarenga, Gabriel M., Palombarini, Julio, Gonçalves, Rosana A., Berengue, Olivia M., Nunes, Ronaldo S., Santos, Sydney F., Villullas, Hebe M., Ciapina, Eduardo G.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Electrochemistry
Energy Storage
Formic acid
Nanoparticles
Original Paper
Oxidation
Palladium
Physical Chemistry
Ruthenium oxide
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Summary:The aim of this work was to study the effect of a RuO 2 support on the activity of Pd nanoparticles for formic acid oxidation, comparing the results with those obtained for Pd/C. In contrast with reports of enhancing effects of RuO 2 for other systems, such as methanol oxidation on Pt particles, our data reveal a detrimental effect of the RuO 2 support on the activity of Pd nanoparticles for the oxidation of formic acid. FTIR spectra show CO 2 formation at potentials as low as 0.10 V and absence of adsorbed CO signals, suggesting that a bifunctional mechanism involving OH species on the oxide support surface does not occur nor has a significant contribution and that formic acid oxidation on Pd/RuO 2 and Pd/C takes place by the direct pathway. The unfavorable effect of the RuO 2 support on activity seems likely to be due to metal-support interactions that modify the Pd electronic properties. Graphical abstract
ISSN:1432-8488
1433-0768
DOI:10.1007/s10008-023-05524-8