Fig. 7: Operando Raman spectra of Cu foam.
From: Dynamics of bulk and surface oxide evolution in copper foams for electrochemical CO2 reduction
Data were collected at OCP and during application of the indicated electric potentials in CO2-saturated 0.1 M KHCO3 (pH 6.8). a Raman spectra split into four sections to highlight the Cu–CO, CuxOHy and adsorbed *CO32-, *CO bands (extended spectral range in Supplementary Fig. 25a). Gray: OCP; green: −0.2 V for 40 min; orange: −0.7 V for 40 min; purple: “stop EC” for 20 min (no potential applied, OCP condition); dark yellow: air-exposed Cu foam in the “dry” state. b Time-traces of Cu–CO (A1, A2), CuxOHy (B1, B2 or B1*, B2*), adsorbed *CO32- and *CO bands intensities. The displayed results here are the average of two datasets (as shown in Supplementary Fig. 26).
