Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.023
Publication date: 11th July 2022
Electrolysis of water, CO2 and nitrogen-based compounds presents the opportunity of generating fossil-free fuels and chemical feedstocks at an industrial scale. These devices are complex in operation, and their activity and efficiency metrics are usually reported as averaged quantities across an electrode. This heat generation, of usually 30-50% of the inputted power, is due to cell inefficiencies. In this work we seek to use these inefficiencies as a measure of spatial electrochemical activity by taking advantage of the link between heat generation and the activity-dependent transport of electrons and ions. To this end we use data from an infrared camera positioned at the backbone of a gas-diffusion electrode in an attempt to develop a 'thermal potentiostat' which provides spatial resolution of electrochemical activity. After a proof-of-concept is displayed for the technique, we present several applications of the technology including catalyst screening, spatial-temporal catalyst measurements, catalyst-defect and ageing detection, and the impact of exothermic CO2-hydroxide interactions during CO2 electrolysis. Combined, we find that a spatial-thermal potentiostat has numerous uses for both novel and established electrochemical reactions towards the production of renewable fuels and feedstocks.
HPIvM and TB would like to acknowledge the co-financing provided by Shell and PPP-allowance from Top Consortia for Knowledge and Innovation (TKI’s) of the Ministry of Economic Affairs and Climate in the context of the e-Refinery Institute.
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