fig2

Figure 2. (A) XRD patterns, (B) Raman and (C) FT-IR spectra of CoO_x-CO₃^2- and IrCoO_x-CO₃^2-. (D) Ir 4f XPS spectra of IrO₂ and IrCoO_x-CO₃^2-, (E) Co 2p, and (F) O 1s XPS spectra of CoO_x-CO₃^2- and IrCoO_x-CO₃^2-.