Fig. 2: Hydrogen chemisorption on Ru/TiO2.

a Solid-state 2H MAS NMR spectra of Ru/TiO2-8 measured at 4 kHz of spinning. b Fitting of experimental spectra. c Zoom in low-frequencies alongside three components used for fitting, resolved via deconvolution. d–f Deconvoluted signals of weakly bonded D on Ru (d), strongly bonded D on Ru in atop configuration, e, and Ti-OD and Ti←O+D2 groups on TiO2 (f). g DFT-deduced structure of atop bonded D on a Ru cluster. h, i Spectra at 10 kHz MAS for Ru/TiO2−1 (h) and Ru/TiO2−8 (i).