Addressing stability challenges of using bimetallic electrocatalysts: the case 
of gold-palladium nanoalloys

Pizzutilo, Enrico; Freakley, Simon J.; Geiger, Simon; Baldizzone, Claudio; Mingers, Andrea Maria; Hutchings, Graham J.; Mayrhofer, Karl J. J.; Cherevko, Serhiy

doi:10.1039/c7cy00291b

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Addressing stability challenges of using bimetallic electrocatalysts: the case of gold-palladium nanoalloys

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Pizzutilo, Enrico
Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Geiger, Simon
Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Baldizzone, Claudio
Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Mingers, Andrea Maria
Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Mayrhofer, Karl J. J.
Helmholtz-Institute Erlangen-Nuremberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Egerlandstrasse 3, 91058 Erlangen, Germany;
Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany ;
Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

/persons/resource/persons125087

Cherevko, Serhiy
Helmholtz-Institute Erlangen-Nuremberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Egerlandstrasse 3, 91058 Erlangen, Germany;
Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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引用

Pizzutilo, E., Freakley, S. J., Geiger, S., Baldizzone, C., Mingers, A. M., Hutchings, G. J., Mayrhofer, K. J. J., & Cherevko, S. (2017). Addressing stability challenges of using bimetallic electrocatalysts: the case of gold-palladium nanoalloys. Catalysis Science & Technology, 7(9), 1848-1856. doi:10.1039/c7cy00291b.

引用: https://hdl.handle.net/11858/00-001M-0000-002D-A64B-A

要旨

Bimetallic catalysts are known to often provide enhanced activity compared to pure metals, due to their electronic, geometric and ensemble effects. However, applied catalytic reaction conditions may induce restructuring, metal diffusion and dealloying. This gives rise to a drastic change in surface composition, thus limiting the application of bimetallic catalysts in real systems. Here, we report a study on dealloying using an AuPd bimetallic nanocatalyst (1 : 1 molar ratio) as a model system. The changes in surface composition over time are monitored in situ by cyclic voltammetry, and dissolution is studied in parallel using online inductively coupled plasma mass spectrometry (ICP-MS). It is demonstrated how experimental conditions such as different acidic media (0.1 M HClO4 and H2SO4), different gases (Ar and O-2), upper potential limit and scan rate significantly affect the partial dissolution rates and consequently the surface composition. The understanding of these alterations is crucial for the determination of fundamental catalyst activity, and plays an essential role for real applications, where long-term stability is a key parameter. In particular, the findings can be utilized for the development of catalysts with enhanced activity and/or selectivity.