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Electrochemical characterization of various bipolar membranes. a) cell voltageECell, b) Faradaic efficiency for CO FECO, c) high frequency resistance HFR in relation to the applied current density of four different bipolar membrane setups, and d) cell voltage in relation to the partial current density of COiCOcompared to other forward-bias BPM studies by Pribyl-Kranewitter et al.[25]and Hansen et al.[33]Measurements were conducted at 40 C cell temperature. The CO2feed (50 mL min-1) was humidified at 30 C. The anode was supplied with DI-water at a flow rate of 20 mL min-1. Each current step was held for 10 min.

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