NDLI: Addressing stability challenges of using bimetallic electrocatalysts: the case of gold

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Catalysis Science & Technology Vol - 7 Issue - 8

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

Content Provider	Royal Society of Chemistry (RSC)
Author	Mingers, Andrea Freakley, Simon J. Geiger, Simon Mayrhofer, Karl J. J. Baldizzone, Claudio Cherevko, Serhiy Pizzutilo, Enrico Hutchings, Graham J.
Copyright Year	2017
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 re-structuring, 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 O2), 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.
Starting Page	1848
Ending Page	1856
Page Count	9
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	7
Issue Number	9
Journal	Catalysis Science & Technology
DOI	10.1039/c7cy00291b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Cyclic voltammetry Oxygen Concentration Inductively coupled plasma mass spectrometry Diffusion
Content Type	Text
Resource Type	Article
Subject	Catalysis

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Addressing stability challenges of using bimetallic 2 electrocatalysts : the case of gold-palladium nanoalloys 3-4 Supporting Information 5

Minimisation of sample matrix effects and signal enhancement for trace analytes using anodic stripping voltammetry with detection by inductively coupled plasma atomic emission spectrometry and inductively coupled plasma mass spectrometry

Quantitative analysis of glass using inductively coupled plasma atomic emission and mass spectrometry, laser micro-analysis inductively coupled plasma atomic emission spectrometry and laser ablation inductively coupled plasma mass spectrometry

Effect of organic solvents and molecular gases on polyatomic ion interferences in inductively coupled plasma mass spectrometry

Palladium‐induced granulomas analysed with inductively coupled plasma mass spectrometry

Comparison of normal and low-flow torches for inductively coupled plasma mass spectrometry using optimized operating conditions

Understanding the Crucial Significance of the Temperature and Potential Window on the Stability of Carbon Supported Pt-Alloy Nanoparticles as Oxygen Reduction Reaction Electrocatalysts.

Chemical fingerprinting of gold using laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS)

Inductively Coupled Plasma Emission Spectrometry and Inductively Coupled Plasma-Mass Spectrometry

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

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Addressing stability challenges of using bimetallic 2 electrocatalysts : the case of gold-palladium nanoalloys 3-4 Supporting Information 5

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