Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.156
Publication date: 23rd September 2021
In the search for efficient electrocatalytic materials and devices, parameters such as current density, potential, selectivity and stability have played key roles due to the their links to future scale-up costs. These direct indicators, however, treat both small and large cells as a black box system where spatial variations across a catalyst are averaged into a singular measured output. Within this work we introduce a secondary method to visually compare electrocatalytic activity across a catalyst's surface using time-resolved infrared imaging. Specifically, the spatial temperature of a catalyst's surface is measured with 10 mK accuracy, which we show provides a link to the overpotential and activity of the catalyst at a given location. Such techniques can be applied to multiple material surfaces for combinatorial catalyst testing, as well as using a singular material to observe current density distributions across a gas-diffusion layer.
In general, heat generation within electrochemical systems is poorly studied, and the disambiguation of various heating effects (overpotential, ohmic, gas-diffusion layer resistivity) is useful for improving not only catalyst development, but scale-up of electrochemical systems. As a demonstration of the proposed infrared measurement method, we show the vast temperature difference occurring between a Pt and Ag catalyst for water-splitting, as well as the effects of CO2 dissolution on the temperature rise during CO2 electrolysis in an alkaline environment. Such observations provide a means of detecting premature gas-diffusion layer flooding, spatial variations, temperatures for reaction-diffusion modelling systems and flow imbalances. The thermal imaging method then has broad applications for H2O, CO2, CO and N2 reduction applications which all contain different phenomena and challenges.
HP.IvM. and T.B. 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. T.B. would also like to acknowledge the NWO for an individual Veni grant.
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