Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.190
Publication date: 18th July 2023
Electrochemical CO2 reduction reaction, is the conversion of CO2 to products through the application of charge in an electrolysis cell. If CO2 could be selectively converted to a particular high value product at low overpotential and high current density, CO2 would be turned into an energy storage molecule and/or a chemical feedstock, driving society closer to closing the carbon loop.
Since the early-mid 90s, research into CO2 reduction reaction materials has primarily centred around copper1-3. Copper has the unique ability to bind to key intermediates *CO and H* moderately4, improving the chance of hydrogenation or coupling reaction steps5. Incremental improvements in cell design and nano structuring have improved the partial current density towards high value C2+ products. Size control6, oxide derived copper7 and facets8 among others effects have been tested, but questions remain whether the intrinsic activity towards the CO2 reduction reaction on copper has been improved. A possible work around, is to alter the localized concentration of key intermediates. Therefore, multiple groups have paired Cu with a secondary, CO producing active site, to form a tandem mechanism9-11.
In this talk I will be highlighting the advantages of using atomic layer deposition (ALD) in electrocatalysis and how it can form a method towards altering selectivity for the CO2 reduction reaction. I will initially present the requirement for altering copper activity through relating activity towards CO2 reduction reaction to surface roughness of nanostructured copper and oxide-derived copper. Subsequently, trends in selectivity with different metal oxide nanoclusters atop copper nanoparticles are shown towards the CO2 reduction reaction, with CO reduction reaction being used as a mechanistic tool. Further characterization techniques both ex and in situ will be presented to shed light on the changes in selectivity including XPS, in-situ contact angle measurements and FTIR amongst others.
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