Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.450
Publication date: 16th December 2024
Copper-based nanostructures are active catalysts for the electrochemical reduction of CO₂ (CO₂RR) to energy-rich products, with morphology often correlated to the catalytic performance. This study investigates the synthesis, structural evolution, and catalytic behaviour of Cu₂O nanoparticles (NPs), integrating morphological control with electronic structure analysis to reveal the true role of morphology in CO₂RR. At the university of Salford, we have developed a surfactant-free synthesis method, which produces Cu₂O NPs with tuneable shapes, including sharp-edged nanocubes (NCs) and novel popcorn-like morphologies (nano-popcorns, NPCs), under varying pH and atmospheric conditions. In-situ techniques, such as X-ray absorption fine structure (XAFS) and UV-Vis spectroscopy, capture the dynamic interplay of dissolution and condensation equilibria, shedding light on the evolving chemical speciation of Cu during nanoparticle formation.
In-situ electrochemical liquid scanning transmission electron microscopy (EC-LSTEM) at Freiburg University, in collaboration with the group of Anna Fischer, has revealed distinct dynamic behaviours of the particles under CO₂RR, depending on their starting morphology. Herein, I will establish parallels between the chemistry involved during synthesis as a function of macroscopic parameters, as revealed by in-situ and ex-situ XAFS and TEM analysis, and the behaviour of the particles under CO₂RR. By bridging these observations, I aim to explain how the particle morphology evolution during CO₂RR is linked to the electronic structure of the electrocatalysts, and how these changes explain catalytic selectivity and stability.
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