Fig. 3: Structural characteristics of catalysts.
From: Tailoring a local acid-like microenvironment for efficient neutral hydrogen evolution
a XRD patterns of as-obtained WO3, HxWO3 and Ir–HxWO3. b Typical TEM image of Ir–HxWO3, the inert in (b) shows the Ir NPs size distribution pattern. c HAADF-STEM images of Ir–HxWO3, with the inset in (c) giving the fast Fourier transform of the corresponding Ir NP. d High-resolution W 4f spectra of Ir–HxWO3 and HxWO3. e High-resolution Ir 4f spectra of Ir–HxWO3 and commercial Ir/C. f The side views of charge density difference in the interface of Ir10 clusters supported on HxWO3. The cyan region reflects an electron-deficient state while the yellow region reflects an electron-rich area, with an isovalue of 0.004 e–/Å3. g Representative TPD-MS thermal desorption profiles for Ir–HxWO3 and HxWO3 and the main desorbed specie detected is H2 with m/e = 2. h Electron localization function evaluations of Ir10-HxWO3. i The pDOS curves of 1s orbitals of different hydrogen atoms in Ir10–HxWO3 and pure HxWO3.
