Extended Data Figure 1: Structural characterization of Pt/MoC-based catalysts.
From: Low-temperature hydrogen production from water and methanol using Pt/α-MoC catalysts
a, Rietveld structure refinement results obtained from XRD analysis of different Pt/MoC-based catalysts, including α-MoC lattice constants and molar percentages of fcc α-MoC. b, Molybdenum K-edge (20,000 eV) X-ray absorption near-edge structure (XANES) spectra of different Pt/MoC-based catalysts and of molybdenum foil and molybdenum oxides; the results suggest that no molybdenum oxide is present in the catalysts. c–g, Platinum L3-edge EXAFS fitting results for: c, 2%Pt/α-MoC; d, 2%Pt/MoC-2; e, 2%Pt/MoC-3; f, 2%Pt/β-Mo2C; and g, 2% Pt/Al2O3 catalysts in R space, where R represents the distance between scattering neighbour atoms and the absorbing atom, without correcting for scattering phase shift. The circles show the original data, and the red curve is the fitting curve; the areas enclosed by dotted green lines represent the fitting region. h, Corresponding platinum L3-edge XANES spectra for the catalysts, platinum foil and platinum oxides. The platinum L3 ‘white line’ (the first maximum of the XANES curve after the absorption edge; dotted line) of Pt/α-MoC catalysts moves to a higher energy than in metallic platinum foil, suggesting that platinum in the catalyst exhibits a positive charge.
