Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.053
Publication date: 11th July 2022
Our sustainable future requires finding affordable and green routes to prepare nanostructured materials for more efficient energy conversion reactions. Compared to bulk materials, nanocatalysts show improved electrocatalytic activity due to their high electrochemically active surface area (ECSA) combined with reduced loadings of noble metals. Metal electrodeposition in deep eutectic solvents (DES) has emerged as a versatile, green and affordable alternative to prepare bimetallic nanostructures. DES are non-toxic solvents which show wide potential limits, enough conductivity, high solubility of the majority of the metals and do not require surfactant agents or additives for controlled growth of the nanostructures.[1] In this work, we investigate the preparation of high surface area nanostructures of Cu-Au[2] and Pd-Au[3] with tunable structure and composition by electrodeposition in choline chlorine plus urea DES. We combine electrochemical methods with microscopy and spectroscopy techniques to characterize the electrodeposited nanostructured materials. We assess the increase of the electroactive surface area through the analysis of metal underpotential deposition (UPD) on the prepared films and, CO stripping on the Pd-Au bimetallic films, to investigate the effect of the Pd loading on the electrochemical response. Finally, Pd and Pd-Au nanostructures were tested for formic acid oxidation in comparison to extended polycrystalline surfaces. Overall, I show a simply and eco-friendly method to prepare mono and bimetallic nanostructures for different electrocatalytic reactions.
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