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Quasi in situ Cu Auger LMM XPS spectra of Cu_CO3, Cu_Br, and Cu_I before (A) and after (B) 1 h of CO2RR at −1.0 V vs. RHE in a CO2‐saturated 0.1 m KHCO3 solution. Br 3p and I 3d XPS spectra of the Cu_Br (C) and Cu_I (D) measured before and after CO2RR are also shown.
