Publication date: 6th November 2020
Electrochemical reduction of CO2 offers to decrease the atmospheric emission of a greenhouse gas, meanwhile producing valuable chemicals – hence closing the “artificial carbon-cycle”. One of these potential products is CO, which combined with H2 could (partly) replace the fossil fuel based organic synthesis methods, and could be a precursor for the formation of a large variety of chemicals including dimethyl ether or specialty wax.
We present a zero gap electrolyzer cell for the continuous-flow electrochemical reduction of CO2, and its possible scale-up avenues in terms of lateral size increase and the construction of multi-layer electrolyzer stacks.[1] Notably, all these structural changes involve the fine-tuning of the operation conditions, achieved by using a custom-designed, almost fully automatized test station. Using commercially available silver catalyst in a gas diffusion electrode configuration we show the selective formation of CO (with H2 being the only cathodic by-product) with similar efficiency metrics in the different sized electrolyzer cells. Further, employing a poly(aryl piperidinium)-based anion exchange membrane (PiperION) with high carbonate conductance in conjunction with a tailored electrolyzer cell structure, we present high partial current densities for CO production, while maintaining high conversion, selectivity at a reasonable cell voltage.[2]
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