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Journal article

Identical locations transmission electron microscopy study of Pt/C electrocatalyst degradation during oxygen reduction reaction

By Pérez Alonso, Francisco1,2; Elkjær, Christian Fink1,2; Shim, Signe Sarah1,2; Abrams, Billie2; Stephens, Ifan1,2; Chorkendorff, Ib1,2

From

Surface Physics and Catalysis, Department of Physics, Technical University of Denmark1

Department of Physics, Technical University of Denmark2

Center for Individual Nanoparticle Functionality, Centers, Technical University of Denmark3

The degradation mechanisms of Pt nanoparticles supported on Carbon have been characterized during oxygen reduction reaction (ORR) conditions using IL-TEM. A TEM grid is used as the sole working electrode allowing a direct correlation between the electrochemical response and the TEM analysis. We mainly observe a decrease in nanoparticle size with some particle disappearance and some particle sintering after potential cycling simulating the start-up and shut-down of a fuel cell.

The observation of nanoparticles with reduced particle size provides evidence that dissolution phenomena are the main cause of degradation in Pt/C electrocatalysts, under ORR conditions. © 2011 Elsevier B.V. All rights reserved.

Language: English
Year: 2011
Pages: 6085-6091
ISSN: 18732755 and 03787753
Types: Journal article
DOI: 10.1016/j.jpowsour.2011.03.064
ORCIDs: Stephens, Ifan and Chorkendorff, Ib

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