fig2

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 2. Phase, surface chemical and valence state characterization of catalytic electrodes. (A) XRD patterns of Ni/NF, Ni-NiOOH, Ni₂Mo/NF and Ni₂Mo-NiOOH/MoO_x; (B) FT-IR spectra of the above catalytic electrodes; (C-E) XPS spectra of Ni₂Mo/NF and Ni₂Mo-NiOOH/MoO_x: (C) Ni 2p, (D) Mo 3d, (E) O 1s; (F) N 1s XPS spectrum of Ni₂Mo-NiOOH/MoO_x. XRD: X-ray diffraction; NF: nickel foam; FT-IR: Fourier transform infrared spectroscopy; XPS: X-ray photoelectron spectroscopy.