Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.165
Publication date: 18th July 2023
Electrochemical CO reduction (ECOR) can act as a potential bridge between CO2-to-CO technologies and renewable production of C2+ chemicals. Along with the development of catalyst materials for selective and efficient CO reduction, it is imperative to optimize electrolysis conditions and cell parameters to efficiently reduce CO at industrially relevant current density and produce pure concentrated product streams. In this work, we study ECOR is three different cell configurations, firstly, microfluidic configuration, secondly, a hybrid configuration with anode zero gap, and lastly, a zero gap configuration. We establish the optimal working conditions for each configuration and compare the fundamental differences in each configuration.
The zero gap configuration is optimal for producing a stable product stream of ethylene, acetate, ethanol and propanol for current densities upto 1 Acm-2 at reasonable cell potentials and can sustain long term C2+ production of >70% for upto 10 hours at a current density of 200 mAcm-2. The catalytic activity in this configuration is insensitive to anolyte pH and the cell can run at relatively lower alkaline concentrations. On the other hand, the product selectivity in hybrid cell configuration changes with catholyte concentrations. The catholyte ensures a high local pH near the cathode and therefore the product selectivity can be altered by changing alkaline concentration. This hybrid configuration works stable with anode catalyst coated membranes for current densities of upto 0.8 Acm-2, however the flowing catholyte makes the long term operation difficult. It is interesting to note the substantial consequence on catalytic activity by altering cell configuration and electrolysis conditions. These results stress on the importance of optimising cell configuration and measurement parameters for attaining optimum working conditions for reaching industrially relevant current densities.
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