Electrocatalysis plays a central role in diverse energy technologies that are of increasing importance for applications in mobile electronics, electric vehicles, as well as renewable energy industry. Despite considerable progresses, many electrocatalytic systems are still plagued by insufficient catalytic efficiency, poor stability or high cost of the precious metal catalysts used. This presentation will cover our research centred around understanding fine structure and composition differences among nanoscale Pt-alloy catalysts and the effect of such nuanced differences on their catalytic performance in oxygen reduction reaction (ORR). Combining theoretical modelling and experimental observations, we further developed a binary experimental descriptor (BED), to accurately reflect calculated oxygen binding energy on the Pt-alloy catalyst surface. We then established an experimental Sabatier plot that can be used to comprehensively predict the activity and stability of Pt-alloy ORR catalysts.

Understanding the nanoscale structure-function relation in Pt-alloy ORR catalysts

ACS Spring 2022

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