Abstract
A well designed cocatalyst loading structure is one of the crucial factors for photocatalytic H2 production. The effectiveness of embedded cocatalyst for the enhancement of photocatalysis still needs to be confirmed. Herein, the porous titanium dioxide embedded with Pd (Pd@TiO2) was successfully obtained by calcination of Pd@MIL-125 as precursor, which was prepared in situ by solvothermal reaction. The characterization results showed that ∼78% of Pd nanoparticles were successfully encapsulated in the catalyst with good dispersion. The surface area of Pd@TiO2 increased from 96.0 to 131.7 m2/g compared with surface loading catalyst Pd/TiO2. Photocatalytic hydrogen production reactions showed that the activity of Pd@TiO2 reached 4.065 mmol/h/g with the apparent quantum efficiency of 22% at 350 nm, which was 2.5 times that of the external loading Pd/TiO2 catalyst prepared by traditional impregnation method and 4.8 times that of the commercial catalyst Pd/P25. The dynamic characterizations showed that Pd@TiO2 exhibited enhanced charge separation efficiency, decreased charge recombination rate, and decreased charge transfer resistance, which promoted the charge utilization and made Pd@TiO2 an excellent photocatalyst. This study provided an effective strategy for the design of Pd embedded porous TiO2 photocatalyst and confirmed that the embedding of cocatalyst is an effective strategy for the design of H2 production photocatalyst.
Published Version
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