Unintended cation crossover influences co2 reduction selectivity in cu-based zero-gap electrolysers

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SUMMARY

Operando X-ray absorption and quasi in situ X-ray photoelectron spectroscopy revealed that the Cu surface speciation showed a strong dependence on the anolyte concentration, wherein dilute anolytes resulted in a mixture of Cu+ and Cu0 surface species, while concentrated anolytes led to exclusively Cu0 under similar testing conditions. In CO2ER experiments using concentrated anolytes (KOH > 0.1 M) the authors observed the formation of K-containing precipitates, which contributed to performance degradation and cell failure, in agreement with previous reports10. Since the flux of K+ through the membrane is likely correlated to . . .

 



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