This talk will focus on using in synchrotron based x-rays to analyze a zero-gap CO2 electrolysis device during operation. By analyzing the Bragg peaks we can monitor not only Cu and its transition from a surface oxide to mettalic during reduction, but we can also measure IrO2 crossover from the anode, and salt formation. Furthermore by monitoring the background scattering we can also use this as a proxy for electrolyte, thus allowing us to watch flooding of the gas diffusion layer in-situ. An in-line GC measuring both cathodic and anodic gases give us incredible insight into device operation. With high salt concentrations, we induce a chaotic regime where we see fluctuations in CO2 reduction selectivity, voltage (at a constant current), and CO2 to O2 ratio as the cell floods and dies. By analysing these fluctuations, we can gain insight into why flooding occurs and methods to mitigate that. Variations in cations further helps us expand this analysis and demonstrates the importance of low salt concentration and high electrolyte solubility to mitigate flooding.

Synchrotron based analysis on zero-gap CO2 and CO eletrolysis devices

Where thousands of chemistry professionals meet to share ideas and advance scientific and technical knowledge. Spring 2023 abstracts, posters, and presentations will launch at the end of March.

ACS Spring 2023

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.