Improving the ORR performance by enhancing the Pt oxidation resistance
Improving the ORR performance by enhancing the Pt oxidation resistance
Authors (11): R. Xu, L. Kang, K. G. Papanikolaou, B. Wang, S. Marlow, Q. He, P. Zhang, J. Wang, D. J. L. Brett, M. Stamatakis, F. R. Wang
Themes: New Catalysts, BAG
DOI: 10.1016/j.jcat.2022.10.025
Citations: 24
Pub type: journal-article
Pub year: 2022

Publisher: Elsevier BV

Issue:

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Publication date(s): 2022/12 (online)

Pages: 311-321

Volume: 416 Issue:

Journal: Journal of Catalysis

Link: [{"URL"=>"https://api.elsevier.com/content/article/PII:S0021951722004456?httpAccept=text/xml", "content-type"=>"text/xml", "content-version"=>"vor", "intended-application"=>"text-mining"}, {"URL"=>"https://api.elsevier.com/content/article/PII:S0021951722004456?httpAccept=text/plain", "content-type"=>"text/plain", "content-version"=>"vor", "intended-application"=>"text-mining"}]

URL: http://dx.doi.org/10.1016/j.jcat.2022.10.025

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.

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1-s2.0-S0021951722004456-mmc1.docx Supporting Information Improving the ORR Performance by Enhancing the Pt... 2022


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