Enhanced Photocatalytic Activity by Pt Confined within N-Doped Carbon on TiO₂ Inner Surface

Abstract

The semiconductor structure has a great effect on the conversion of solar energy into hydrogen energy. Herein, the hollow TiO2 composite with an N-doped carbon (NC) layer and evenly dispersed Pt nanoparticles (NC/Pt@TiO2) on its inner surface was prepared through the synchronous precarburization of N-containing polymers and in situ reduction of Pt precursor. Benefiting from all of the well-distributed and Pt nanoparticles that contain both Pt0 and Pt2+, high conductivity of NC layers, high surface area, big bore diameter, and the optimized charge transfer between Pt and NC, the photocatalytic H2 production by NC/Pt@TiO2-900 reaches up to 23.8 mmol·h–1·g–1. Moreover, due to the strong combination of Pt and NC layers through Pt–N bonds, NC/Pt@TiO2-900 still presents good photocatalytic stability. Given all this, this study highlights the greater potential of the thin NC layers in the development of novel photocatalysts with excellent performance.

Cooperation of Pt and TiOx in the Hydrogenation of Nitrobenzothiazole

“…All the catalysts have similar Pt particle sizes centered at ∼3 to 4 nm. As shown in Figure 1b, the high resolution (HR)-TEM image of representative Pt/TiO 2 -200 clearly shows a lattice spacing of 0.22 nm related to Pt (111), 36,37 and the other lattice fringes with d (120) = 0.41 nm assigned to partially reduced Ti 4 O 7 (120) planes could be clearly observed at the interface of Pt NPs. 38 In addition, the surface of Pt NPs was covered by an amorphous layer formed by TiO x migrating from the support onto Pt NPs.…”

Electrolytic Hydrogen Evolution Study of Porous Tungsten Carbide‐Loaded Pt Derived from ZIFs

“…These WC particles are covered by about 8–12 layers of graphitic carbon layers like Co elements. These carbon layers can improve the conductivity of the catalyst, increase the specific surface area of WC and fix Pt particles [20] . but If there are too many carbon layers, it will affect the exposure of WC active sites and may hinder the synergistic effect between WC and Pt [21] .…”

“…These carbon layers can improve the conductivity of the catalyst, increase the specific surface area of WC and fix Pt particles. [20] but If there are too many carbon layers, it will affect the exposure of WC active sites and may hinder the synergistic effect between WC and Pt. [21] Therefore, controlling the amount of these carbon deposits is extremely important for the activity of the catalyst.…”