Proceedings of nanoGe Fall Meeting19 (NFM19)
Publication date: 18th July 2019
Carbon dioxide electroreduction is becoming an area of interest as global warming becomes a more and more pressing issue. Renewable energy such as wind and solar have issues with intermittent power production that can provide surplus energy in times of low demand. This excess energy can be used to electrochemically convert carbon dioxide to useful high energy density products such as ethanol and ethylene. This technique is a promising carbon neutral method for producing useful chemical products, however the reaction suffers from poor selectivity and low efficiency. This selectivity issue produces a range of different products with large potential losses, therefore there is a motivation to develop a catalyst for a single useful products at lower overpotentials. 1
Copper has been recognised as a benchmark catalyst for carbon dioxide electroreduction having been known to produce 16 different useful products as reported by Kuhl et al. 2 One of the main factors identified for improving catalytic activity is roughness. This is due to an increased number of undercoordinated edge sites which coordinate to the CO intermediate allowing the formation of useful products. Nanostructured copper has been an area of interest in recent years due to the increased surface area and roughness. This creates an increased number of desirable qualities such as undercoordinated edge sites producing useful products such as oxygenates. 3
This work studied ultrasmall copper nanoparticles in the range of 5 to 10 nm to understand the difference in activity versus the benchmark, polycrystalline copper.4 X-ray diffraction and transmission electron microscopy were used to characterise the Cu nanoparticles. Gas chromatography was used to identify and quantify the products of the carbon dioxide reduction.