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

Pizzutilo E, Freakley SJ, Geiger S, Baldizzone C, Mingers A, Hutchings GJ, Mayrhofer K, Cherevko S (2017)

Publication Status: Published

Publication Type: Journal article

Publication year: 2017

Journal

Catalysis: Science and Technology Royal Society of Chemistry

Publisher: ROYAL SOC CHEMISTRY

Book Volume: 7

Pages Range: 1848-1856

Journal Issue: 9

DOI: 10.1039/c7cy00291b

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.

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) Cardiff University GB United Kingdom (GB)

How to cite

APA:

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

MLA:

Pizzutilo, Enrico, et al. "Addressing stability challenges of using bimetallic electrocatalysts: the case of gold-palladium nanoalloys." Catalysis: Science and Technology 7.9 (2017): 1848-1856.

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