Fig. 4: Chemical and electrochemical characterisations of Si-incorporated strontium cobaltites.
From: Direct evidence of boosted oxygen evolution over perovskite by enhanced lattice oxygen participation
a Co 2p core-level XPS spectra of SCO and Si–SCO, with peak fitting results based on multiple cobalt species. Here sat. denotes satellite peaks. b Co L-edge NEXAFS spectra of SCO and Si–SCO. Inset of b shows the Co L3-edge spectra in an expanded photon energy scale. c O 1s core-level XPS spectra of SCO and Si–SCO, with peak fitting results illustrated in the stacked columns. d CV curves of SCO and Si–SCO in Ar-saturated 6 M KOH, where redox peaks indicate the electrochemical oxygen intercalation/de-intercalation. Inset of d shows the chronoamperometry data (i vs. t–1/2) used for the calculation of oxygen ion diffusion coefficients.
