Publication date: 6th November 2020
Electrochemical reduction of CO2 to useful chemicals is a promising example of carbon capture and utilization, therefore it has received lots of interest from the scientific community as a possible solution for earth’s global warming and the transitioning to a CO2 neutral industry. [1] Over the last few years, the majority of the researchers have focused on improving the catalyst material, leading to higher current densities at lower cell potentials and increased selectivity’s. [2] However, so far, little attention has been given to the investigation and optimization of the electrolyzer design and process parameters, which are equally, if not more, important in order to up-scale the process towards an industrial level. [3] In this poster a zero-gap flow electrolyzer with a tin-coated gas diffusion electrode as cathode to convert humidified gaseous CO2 to formate is presented. The influence of various parameters such as flow pattern, rate of humidification and type of membrane on salt precipitation and reactor performance (Faradaic efficiency, cell voltage and product concentration) were investigated. It was demonstrated that (bi)carbonate precipitation and flooding of the electrode can be prevented by optimized water management in the electrolyzer and high FE's and formate concentration can be achieved. Direct water injection was validated as a novel approach on water management. At 100 mA/cm2, direct water injection in combination with an interdigitated flow channel resulted in a FE of 80% and a formate concentration of 65.4 +/- 0.3 g/l without salt precipitation for a prolonged CO2 electrolysis of 1 hr. The use of bipolar membranes in the zero-gap configuration mainly produced hydrogen. [4]
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