fig3

From: Unveiling proton-regulated Mo=O/Mo-O^- centers in reconstructed Ni₂Mo-NiOOH/MoO_x interfaces toward accelerated proton-coupled electron transfer for urea oxidation reaction

Unveiling proton-regulated Mo=O/Mo-O<sup>-</sup> centers in reconstructed Ni<sub>2</sub>Mo-NiOOH/MoO<sub>x</sub> interfaces toward accelerated proton-coupled electron transfer for urea oxidation reaction

Figure 3. Operando Raman spectra of catalytic electrodes under UOR. (A-C) Operando Raman spectra of Ni-NiOOH at varied anodic potentials: (A) 2D contour plot in the range of 440-600 cm^-1; (B) corresponding 3D waterfall plot; (C) 2D contour plot in the range of 980-1,200 cm^-1; (D-F) Operando Raman spectra of Ni₂Mo-NiOOH/MoO_x at varied anodic potentials: (D) 2D contour plot in the range of 440-600 cm^-1; (E) corresponding 3D waterfall plot; (F) 2D contour plot in the range of 980-1,200 cm^-1. RHE: Reversible hydrogen electrode; UOR: urea oxidation reaction.