Positive Effect of Surface Doping with Au on the Stability of Pt-Based Electrocatalysts

Gatalo M, Jovanovic P, Polymeros G, Grote JP, Pavlisic A, Ruiz-Zepeda F, Selih VS, Sala M, Hocevar S, Bele M, Mayrhofer K, Hodnik N, Gaberscek M (2016)

Publication Status: Published

Publication Type: Journal article

Publication year: 2016

Journal

ACS Catalysis American Chemical Society

Publisher: AMER CHEMICAL SOC

Book Volume: 6

Pages Range: 1630-1634

Journal Issue: 3

DOI: 10.1021/acscatal.5b02883

Abstract

Corrosion resistance of a transition-metal-rich PtCu3/C oxygen reduction reaction (ORR) catalyst as a representative of Pt alloy-based materials has been significantly improved by doping with small amounts of gold (<1 at. %). Transmission electron microscopy imaging shows near-surface segregation of both platinum and gold with the underlying core consisting predominantly of intermetallic PtCu3. The resulting PtAu skin catalyst shows improved resistance against Cu dissolution, as well as against carbon corrosion if compared to its PtCu3 precursor. Also, it exhibits a much higher Pt and carbon stability than a widely used Pt/C standard. Most importantly, the Au doped sample shows a substantial improvement in stability at the elevated temperature (60 degrees C) degradation test (10 000 cycles; 0.4-1.2 Vim) simulating a real PEM fuel cell environment.

Authors with CRIS profile

Karl Mayrhofer Lehrstuhl für Elektrokatalyse (HIERN)

Involved external institutions

Max-Planck-Institut für Eisenforschung GmbH (MPIE) / Max Planck Institute for Iron Research DE Germany (DE) National Institute of Chemistry / Kemijski Inštitut SI Slovenia (SI) University of Ljubljana (UL) / Univerza v Ljubljani SI Slovenia (SI)

How to cite

APA:

Gatalo, M., Jovanovic, P., Polymeros, G., Grote, J.-P., Pavlisic, A., Ruiz-Zepeda, F.,... Gaberscek, M. (2016). Positive Effect of Surface Doping with Au on the Stability of Pt-Based Electrocatalysts. ACS Catalysis, 6(3), 1630-1634. https://dx.doi.org/10.1021/acscatal.5b02883

MLA:

Gatalo, Matija, et al. "Positive Effect of Surface Doping with Au on the Stability of Pt-Based Electrocatalysts." ACS Catalysis 6.3 (2016): 1630-1634.

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