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a) XPS Cu 2p of as prepared U‐NC deposited on a glassy carbon electrode. b) Quasi in situ XPS Cu 2p and c) Cu Auger LMM spectra of the U‐NC and S‐NC (23 wt %) catalyst after one hour of CO2RR at −0.95 VRHE and −0.65 VRHE. Cu AES of as‐prepared catalysts can be found in Figure S8.
