Massive Ti3+ self-doped by the injected electrons from external Pt and the efficient photocatalytic hydrogen production under visible-Light

Supported Pt Nanoparticles on Mesoporous Titania for Selective Hydrogenation of Phenylacetylene

“…This result implies that Pt is more surface oxidized in 2.5 nm Pt NPs, which is further evidenced in Ti 2p XPS spectra. As shown in Figure 4B , a strong Ti 3+ XPS binding energy peak at around 458.2 eV is found in 2.5 nm Pt NPs on mTiO 2 , which is absent in the pure mTiO 2 (Yang et al, 2017 ; Ou et al, 2018 ). These results show that 2.5 nm Pt NPs have a stronger interaction with the mTiO 2 support where Pt NPs are partially oxidized and demonstrate electron back-donation to reduce Ti 4+ to Ti 3+ of mTiO 2 .…”

Pt nanoparticles decorated heterostructured g-C3N4/Bi2MoO6 microplates with highly enhanced photocatalytic activities under visible light

“…The characterized peaks at 70.9 and 74.2 eV of Pt 0 are clearly observed on 4f 7/2 and 4f 5/2 , respectively. The peaks at 72.0 and 75.6 eV are attributed to Pt 2+ , indicating the formation of Pt-O 58 and further demonstrating the partial pre-adsorption of Pt 2+ onto the CN matrix during the facile one-step hydrothermal synthetic method. Fig.…”

MoS2 Quantum Dots Modified Black Ti3+–TiO2/g‐C3N4 Hollow Nanosphere Heterojunction toward Photocatalytic Hydrogen Production Enhancement

“…Furthermore, as shown in Figure b, three peaks of the O 1s at 529.8, 531.0, and 532.4 eV are ascribed to the Ti─O bond, ─OH bond adsorbed on the surface, and O v accompanied by the Ti 3+ , respectively, which is regarded as another credible evidence for the forming of Ti 3+ ions self‐doping and corresponds to previous literature. The HRXPS spectra of the C 1s and N 1s are shown in Figure c,d, in which the peaks of C 1s (Figure c) at 284.6, 286.0, and 288.3 eV correspond to the C─C bonds, C─NH 2 species, and the N─C=N species, and the peaks of N 1s (Figure d) at 398.8, 399.9, 401.0, and 404.7 correspond to the C─N=C, N─(C) 3 , C─N─H, and π‐excitations, respectively. As known, the g‐C 3 N 4 is composed of these basic units, which would be a reliable evidence for the presence of g‐C 3 N 4 shell.…”

“…Compared with other heterogeneous element doping, Ti 3+ ion self‐doping exhibits much more lattice matching and can introduce oxygen vacancy (O v ) at the same time, which can improve the structural stability and light response more efficiently. Moreover, Ti 3+ ion can reduce the H 2 activation barrier via a self‐formed hydrogenated shell to enhance the HER, and many related works have been reported; for example, Li et al have prepared Ti 3+ ‐/S‐doped TiO 2 nanorods with remarkable photocatalytic hydrogen production; Wei et al have reported a new approach to prepare the Ti 3+ –TiO 2 with an excellent HER; Hu et al have fabricated the Ti 3+ self‐doped TiO 2 /SiO 2 nanocomposite to enhance the visible light HER; and so on . Although the aforementioned achievements would provide an inspiring vision, how to prepare the Ti 3+ –TiO 2 controllably and keep it stable have been reported less than others and would be important factors for enhancing the photocatalytic hydrogen production.…”