Fig. 2: The characterisation of proton incorporated in OER process of α-MnO2.
From: Electric-field-assisted proton coupling enhanced oxygen evolution reaction
a–c The Rutherford backscattering spectrometry spectra for the pristine MnO2 and MnO2 samples treated by chronoamperometry at 0.9 and 1.6 V vs. RHE. d–f The corresponding ERD hydrogen spectra. Inset: the percentage of different elements present on the surface of the MnO2. g Mn K-edge XANES spectra of MnO2 measured by multi-step chronoamperometry at 0.9 and 1.6 V vs. RHE. The upper left inset is the illustration of multi-step potential measurement, and the colour corresponds to the curves. The lower left inset is the pre-edge region with a doublet. The lower right inset shows the shift of absorption at half-normalised intensity. h The corresponding Fourier transforms of Mn K-edge EXAFS spectra using k3 weighting. i The plot of bond/shell length fitted from EXAFS spectra. Mn-Mnedge and Mn-Mncorner represent edge-shared Mn-Mn coordination and corner-shared Mn-Mn coordination respectively.
