Nanoscale Morphological and Structural Transformations of PtCu Alloy Electrocatalysts during Potentiodynamic Cycling

Khalakhan I, Waidhas F, Brummel O, Vorokhta M, Kus P, Yakovlev Y, Bertram M, Dopita M, Matolinova I, Libuda J, Matolin V (2018)


Publication Status: Published

Publication Type: Journal article

Publication year: 2018

Journal

Publisher: AMER CHEMICAL SOC

Book Volume: 122

Pages Range: 21974-21982

Journal Issue: 38

DOI: 10.1021/acs.jpcc.8b06840

Abstract

PtCu bimetallic alloys are known to provide better activity than pure platinum in proton exchange membrane fuel cells. However, such catalysts undergo complex degradation processes during fuel cell operation, resulting in deterioration of their activity. By using in situ electrochemical (EC) atomic force microscopy combined with in situ EC infrared reflection absorption spectroscopy, we provide a comprehensive investigation of morphological and structural transformations of PtCu model thin film catalysts during accelerated degradation tests (ADTs). The ADTs consist of potentiodynamic cycling to three different upper potentials relevant for different modes of fuel cell operation. The results show that, depending on the upper potential limit, PtCu alloy electrocatalysts are subject to drastic changes in the surface composition, morphology, and structure.

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APA:

Khalakhan, I., Waidhas, F., Brummel, O., Vorokhta, M., Kus, P., Yakovlev, Y.,... Matolin, V. (2018). Nanoscale Morphological and Structural Transformations of PtCu Alloy Electrocatalysts during Potentiodynamic Cycling. Journal of Physical Chemistry C, 122(38), 21974-21982. https://dx.doi.org/10.1021/acs.jpcc.8b06840

MLA:

Khalakhan, Ivan, et al. "Nanoscale Morphological and Structural Transformations of PtCu Alloy Electrocatalysts during Potentiodynamic Cycling." Journal of Physical Chemistry C 122.38 (2018): 21974-21982.

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