We reveal that a significant amount (>30%) of the liquid products from electrochemical CO₂ reduction (CO₂RR) in a flow reactor can cross the gas diffusion electrode (GDE) and anion exchange membrane (AEM). Crossover of volatile products through the GDE occurs mainly by evaporation, and the migration rate increases linearly with current density and CO₂ flow rate. Non-volatile products prefer to cross the AEM through electromigration, and the migration rate is affected by the current density and the flow rate of the catholyte. These results highlight the importance of considering product crossover in CO₂RR to adequately assess the catalytic performance.

我们发现，流动反应器中电化学CO ₂还原（CO ₂ RR ）产生的大量液体产品（> 30％）可以穿过气体扩散电极（GDE）和阴离子交换膜（AEM）。挥发性产物通过GDE的转化主要是通过蒸发发生的，迁移速率随电流密度和CO ₂流量线性增加。非易失性产品更喜欢通过电迁移穿过AEM，并且迁移速率受电流密度和阴极电解液流速的影响。这些结果凸显了考虑在CO ₂ RR中产物交叉以充分评估催化性能的重要性。