(Invited) Understanding Catalytic Structure-Function Relationships via in-Situ Surface Stress Measurements of Electrodeposited Metal Films

Le résumé fourni par la source

Ultrathin Pt films are emerging as promising catalysts for fuel cells and water electrolyzers, offering improved utilization of the costly metal and enhanced performance through catalyst-support or alloying interactions. Properly matched to a substrate, Pt overlayers exhibit significantly enhanced catalytic properties attributed to changes in electronic and geometric properties induced by the substrate, including d-band shifts influenced by lattice misfit strain. This talk reports will focus the ability of in-situ stress measurements to offer real-time insight into stress development during Pt overlayer electrodeposition on secondary metal supports. Moreover, these measurements are also used to enable monitoring of stress-based events during the catalytic application of electrodeposited films. For instance, in the electrochemical conversion of organic molecules, carbon monoxide (CO) serves as a pivotal intermediate, particularly in the oxidation of oxygenated hydrocarbons in fuel cells. Understanding changes in stress during CO adsorption and oxidation using these films facilitates empirical correlations between structure and function, driving the development of superior electrocatalysts crucial for advancing towards a circular carbon-based economy.

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