WW Kolloquium: Prof. Dr. Marco Altomare – Dewetted nanoparticles – A platform to study nanoscale effects in electrocatalysis

Date: 23. January 2024Time: 16:00 – 17:30Location: Zoom

Prof. Dr. Marco Altomare
Dept. of Chemical Engineering, MESA+ Institute for Nanotechnology
University of Twente, The Netherlands
Dewetted nanoparticles - A platform to study nanoscale effects in electrocatalysis
Metal nanoparticles (NPs) are key in heterogeneous catalysis such as in electrocatalytic applications. NPs’ morphology, composition, and structure largely affect their performance, and determine their electrochemical activity, selectivity, and stability.

To obtain interpretable electrochemical responses and define design criteria for electrocatalysts with enhanced performance, it is crucial to minimize the chemical and material complexity of electrodes [1]. Wet chemical methods are often applied in research to produce high surface area electrocatalysts, typically in the form of inks and coatings, including additives, binders, ionomers, etc., hence featuring complex structure, morphology, and chemical composition. This complexity can make it difficult to assess intrinsic catalytic properties of electrocatalysts and might also lead to undesired mass transfer effects.

My talk is on designing and nanostructuring binder- and ionomer-free electrodes by solid-state dewetting [2,3], i.e., the heat-induced agglomeration of (sputtered) thin metal films into nanoparticles with tunable loading, size, structure, and composition.

In this context, I discuss aspects such as:
i) The use of “dewetted electrodes” to study nanoscale effects, such as electronic metal support interactions (EMSI), in electrocatalytic reactions [4];
ii) How dewetting can be steered to produce model, spatially separated and coherently oriented metal NPs with defined exposed facets [5], and desired composition [6,7];
iii) and finally, perspective possibilities to apply scanning electrochemical techniques, in-situ spectroscopic tools or single-particle probes to investigate surface and interfacial phenomena of dewetted NP electrocatalysts.


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Event Details

23. January 2024
16:00 – 17:30


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