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A–E) GC‐MS‐spectra of the electrolyte solution after 5 h CPE at −1.25 V vs. Ag/AgCl, pH 6, 12CO2 and 13CO2, respectively (A) of 12CH3 12COOH and (B) deuterium substituted acetic acid, D2O/H2O (1/5) (C) 13CH3 13COOH (D) 12CH3OH (E) 13CH3OH. F) 1H‐coupled‐13C‐NMR‐spectrum in 13CO2 saturated phosphate buffer (pH 6) after 5 h CPE at −1.25 V vs. Ag/AgCl under 13CO2 saturation.
