Unintended cation crossover influences CO₂ reduction selectivity in Cu-based zero-gap electrolysers.

1b (right y-axis), revealing a clear trend that coincides with the inflection of the selectivity—for [KOH] <0.1 M, the detected K + is low and varies only gradually with [KOH], whereas there is a steep increase across higher concentrations reaching significant magnitudes of K + .

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