Fig. 3: Initial iridium oxidation state does not drive electrochemical activity.
From: The origin of the high electrochemical activity of pseudo-amorphous iridium oxides
a Graph summarizing the main oxidation state observed from XPS spectra and XANES region spectra analysis for the different Mo content (theoretical %) as a function of calcination temperature. b–d SEM images of the series prepared with 30% Mo and calcined at 450 °C, 500 °C and 550 °C, scale bar 200 nm, and corresponding operando characterization at the Ir L3-edge: e XANES spectra recorded at 0.2 V vs. NHE, 1.7 V vs. NHE and back to 0.2 V vs. NHE and the corresponding peak-top values; f Superposition of the EXAFS spectra of the 30% Mo series (calcined at 500 °C) at 0.2 V vs. NHE (black diamonds), 1.7 V vs. NHE (pink circles) and back to 0.2 V vs. NHE (blue triangles). Source data are provided as a data source file.
