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Mesoporous coupled ZnO/TiO2 photocatalyst nanocomposites for hydrogen generation
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Image of FIG. 1.
FIG. 1.

Schematic flow diagram for the sol-gel synthesis of the ZnO-TiO nanocomposites using a structure directing surfactant template.

Image of FIG. 2.
FIG. 2.

XRD profiles of ZnO-TiO composites prepared with different Zn loading and calcined at 500 °C for 5 h.

Image of FIG. 3.
FIG. 3.

HRTEM images of 50ZnO composite prepared by the sol-gel method and annealed at 500 °C, confirming a spherical structure with lattice fringes 3.5 Å and 2.5 Å of (101) and (101) planes, respectively, corresponding to TiO and ZnO. The images (a) and (b) show particle size and lattice fringes, respectively. The image (b) is the magnified TEM image of 50ZnO composite showing a close neighborhood contacts between ZnO and TiO nanoparticles.

Image of FIG. 4.
FIG. 4.

Nitrogen physisorption isotherms (a) and corresponding pore size distribution (b) of mesoporous ZnO and ZnO-TiO composites prepared by sol-gel method.

Image of FIG. 5.
FIG. 5.

UV-visible DRS of ZnO-TiO composites and ZnO, which were calcined at 500 °C for 5 h.

Image of FIG. 6.
FIG. 6.

Raman spectra of all samples prepared in this study.

Image of FIG. 7.
FIG. 7.

Nyquist plots of commercial TiO P25, and ZnO, 10ZnO, 30ZnO, and 50ZnO nanocomposites, which were annealed for 5 h at 500 °C. The frequency range was 300 kHz-50 mHz with amplitude of 10 mV.

Image of FIG. 8.
FIG. 8.

Photocatalytic H evolution from water-methanol media in the presence of coupled ZnO-TiO composites relative to commercial TiO P25 and pure phase ZnO.

Image of FIG. 9.
FIG. 9.

Schematic representation showing electron/hole separation process at coupled ZnO-TiO heterojunction interface.


Generic image for table
Table I.

Photocatalytic activities of ZnO-TiO nanocomposites for H production from an aqueous methanol solution.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Mesoporous coupled ZnO/TiO2 photocatalyst nanocomposites for hydrogen generation