Fig. 3: Reduction and reoxidation kinetics of copper carbonate hydroxides (CarCarHyd) from time series of XAS spectra.
From: Dynamics of bulk and surface oxide evolution in copper foams for electrochemical CO2 reduction
The data were collected at OCP and during application of an electric potential in CO2-saturated 0.1 M KHCO3 (pH 6.8). The data of (a) and (b) relate to reduction at −0.2 V of the Cu foam initially present as CuCarHyd; the data of (c) and (d) relate to subsequent oxidation at +0.6 V. In (a) and (c), time series of Cu K-edge XANES spectra are displayed. In (b) and (d), time courses of current density (right y-axes) and normalized fluorescence intensity (left y-axes) for excitation at 9025 eV/9013 eV are given. The time interval between the start of subsequent XAS scans was 227 s. The reoxidation half-time in (d) is 690 s.
