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

Pizzutilo, E., Freakley, S. J., Geiger, S., Baldizzone, C., Mingers, A. M., Hutchings, G. J., et al. (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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-A64B-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-A65B-6
Genre: Journal Article

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 Creators:
Pizzutilo, Enrico1, Author              
Freakley, Simon J.2, Author              
Geiger, Simon1, Author              
Baldizzone, Claudio1, Author              
Mingers, Andrea Maria1, Author              
Hutchings, Graham J.2, Author              
Mayrhofer, Karl J. J.1, 3, 4, Author              
Cherevko, Serhiy1, 3, Author              
Affiliations:
1Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863354              
2Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, UK, persistent22              
3Helmholtz-Institute Erlangen-Nuremberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Egerlandstrasse 3, 91058 Erlangen, Germany, ou_persistent22              
4Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany , ou_persistent22              

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Free keywords: Binary alloys, Catalysis, Catalyst selectivity, Catalysts, Cyclic voltammetry, Dissolution, Electrocatalysts, Gold alloys, Inductively coupled plasma mass spectrometry, Mass spectrometry, Palladium alloys
 Abstract: 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.

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Language(s): eng - English
 Dates: 2017-05-07
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: ISI: 000400974000005
DOI: 10.1039/c7cy00291b
 Degree: -

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Title: Catalysis Science & Technology
  Other : Catal. Sci. Technol.
Source Genre: Journal
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Publ. Info: Cambridge : Royal Society of Chemistry
Pages: - Volume / Issue: 7 (9) Sequence Number: - Start / End Page: 1848 - 1856 Identifier: Other: 2044-4753
CoNE: /journals/resource/2044-4753