Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
Publication date: 18th July 2023
The electrochemical CO2 reduction (CO2RR) into fuels and chemicals is seen as a carbon-neutral route to defossilize the chemical industry and mitigate climate change [1,2]. Membrane electrode assembly (MEA) based electrolysers are considered the most promising configuration to achieve the industrialization of this technology. However, its competitiveness is limited by several technical challenges owing to the complexity of the process, e.g., the cathode deactivation during long-term operation or the large energy barrier and sluggish kinetics of the anodic oxygen evolution reaction (OER), which is energy intensive [3,4]. Thus for an efficient cathodic CO2RR the corresponding anodic reaction must also be optimized.
In this study, we show that the fabrication of the anode used in the MEA system has a strong impact on the reactor performance as well as on the reaction selectivity. As anode catalyst, we used the state-of-the-art OER catalyst IrO2, while Cu is used as CO2 electroreduction catalyst at the cathode. Two methods were employed to immobilize IrO2 onto different substrates (Ti-mesh and carbon cloth) - the dip coating method and spray coating using different additives (Nafion or PTFE). We observed that spraying with Nafion (20 wt. %) produced the optimum performing electrode, showing no catalyst detachment, and allowing CO2RR in a 5 cm2 zero-gap MEA electrolyser up to 1 A cm-2.
C.A., I.S., R.M., and B.J. acknowledge funding by the BMBF in the framework of the NanomatFutur project “MatGasDif” (03XP0263). V.C. is grateful to IMPRS-SURMAT for a PhD fellowship.
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