Optimal Pt-Au Alloying for Efficient and Stable Oxygen Reduction Reaction Catalysts

Xie X, Briega-Martos V, Farris R, Dopita M, Vorokhta M, Skála T, Matolínová I, Neyman KM, Cherevko S, Khalakhan I (2023)

Publication Type: Journal article

Publication year: 2023

Journal

ACS Applied Materials and Interfaces American Chemical Society

Book Volume: 15

Pages Range: 1192-1200

Journal Issue: 1

DOI: 10.1021/acsami.2c18655

Abstract

Stabilization of cathode catalysts in hydrogen-fueled proton-exchange membrane fuel cells (PEMFCs) is paramount to their widespread commercialization. Targeting that aim, Pt-Au alloy catalysts with various compositions (Pt95Au5, Pt90Au10, and Pt80Au20) prepared by magnetron sputtering were investigated. The promising stability improvement of the Pt-Au catalyst, manifested in suppressed platinum dissolution with increasing Au content, was documented over an extended potential range up to 1.5 VRHE. On the other hand, at elevated concentrations, Au showed a detrimental effect on oxygen reduction reaction activity. A systematic study involving complementary characterization techniques, electrochemistry, and Monte Carlo simulations based on density functional theory data enabled us to gain a comprehensive understanding of the composition-activity-stability relationship to find optimal Pt-Au alloying for maintaining the activity of platinum and improving its resistance to dissolution. According to the results, Pt-Au alloy with 10% gold represent the most promising composition retaining the activity of monometallic Pt while suppressing Pt dissolution by 50% at the upper potential limit of 1.2 VRHE and by 20% at devastating 1.5 VRHE

Involved external institutions

Universitat de Barcelona (UB) / University of Barcelona ES Spain (ES) Univerzita Karlova v Praze / Charles University in Prague CZ Czech Republic (CZ) Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE)

How to cite

APA:

Xie, X., Briega-Martos, V., Farris, R., Dopita, M., Vorokhta, M., Skála, T.,... Khalakhan, I. (2023). Optimal Pt-Au Alloying for Efficient and Stable Oxygen Reduction Reaction Catalysts. ACS Applied Materials and Interfaces, 15(1), 1192-1200. https://doi.org/10.1021/acsami.2c18655

MLA:

Xie, Xianxian, et al. "Optimal Pt-Au Alloying for Efficient and Stable Oxygen Reduction Reaction Catalysts." ACS Applied Materials and Interfaces 15.1 (2023): 1192-1200.

BibTeX: Download