Fig. 6: Surface oxides reduction (at -0.2 V) and electrochemical reformation tracked by time series of Raman spectra.
From: Dynamics of bulk and surface oxide evolution in copper foams for electrochemical CO2 reduction
Data were collected at OCP and during application of an electric potential in CO2-saturated 0.1 M KHCO3 (pH 6.8). Time-series of SERS spectra of Cu foam were recorded at (a) −0.2 V and (c) +0.6 V. Time-courses of band intensities of indicated species are shown in (b) and (d). For presentation of (a) and (c) with spectra collected at additional times and the assignment of further bands, see Supplementary Fig. 22. The same Cu-foam sample was used in (a) and (c) and was measured at OCP condition firstly before being exposed to reducing (−0.2 V) and oxidizing (+0.6 V) potential. The procedure for determination of the maximum peak intensity is described in Section 3 of the SI.
