Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jcat.2022.10.025
Title: Improving the ORR performance by enhancing the Pt oxidation resistance
Authors: Xu, R
Kang, L
Papanikolaou, KG
Wang, B
Marlow, S
He, Q 
Zhang, P
Wang, J
Brett, DJL
Stamatakis, M
Wang, FR
Issue Date: 1-Dec-2022
Publisher: Elsevier BV
Citation: Xu, R, Kang, L, Papanikolaou, KG, Wang, B, Marlow, S, He, Q, Zhang, P, Wang, J, Brett, DJL, Stamatakis, M, Wang, FR (2022-12-01). Improving the ORR performance by enhancing the Pt oxidation resistance. Journal of Catalysis 416 : 311-321. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jcat.2022.10.025
Abstract: Proton exchange membrane fuel cells require oxygen reduction catalysts with high activity and stability. Pt based alloy materials are most widely applied ORR catalyst due to its high intrinsic activity, but usually suffer from rapid deactivation as a result of particle agglomeration, detachment, Ostwald ripening and/or Pt dissolution. Here we investigate the degradation of the PdPt alloys via in situ X-ray absorption fine structure, Δμ analysis, identical location-electron microscopy and DFT calculations. We conclude that the origin of high activity and stability of the PdPt catalyst stems from the oxidation resistance of metallic Pt, forming mainly surface adsorbed O species at high potentials. Two stage degradation process are observed, showing an evolution of dynamic surface dependent ORR performance along with the deactivation process. The careful design of Pt alloy structure leads to controlled surface oxygen behaviours. This opens a new way to increase the lifespan of fuel cells and improve the Pt utilization efficiency.
Source Title: Journal of Catalysis
URI: https://scholarbank.nus.edu.sg/handle/10635/239095
ISSN: 0021-9517
1090-2694
DOI: 10.1016/j.jcat.2022.10.025
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