Journal
RSC ADVANCES
Volume 6, Issue 22, Pages 18198-18203Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra25358f
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Funding
- Research Fund of UNIST [1.150109.01]
- [IBS-R004-G4]
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A series of photocatalysts were prepared with crystalline macro-mesoporous oxides and Pt nanoparticles (Pt-TiO2, Pt-Ta2O5, Pt-Nb2O5, Pt-ZrO2, and Pt-Al2O3). Transmission electron microscopy, X-ray diffraction, and N-2 adsorption-desorption isotherms reveal that the oxides have prominent macro-and mesoporosity in the crystalline walls. The high surface area and crystalline walls of the oxides play significant roles in photocatalytic H-2 production. Pt-TiO2 catalysts show enhanced photocatalytic water splitting efficiency for H-2 generation (solar energy conversion efficiency of 1.06%) under a 150 W and 1.5 AM solar simulator. Pt-Ta2O5 and Pt-Nb2O5 also generate noticeable photocatalytic activities of 0.21% and 0.16%, respectively. The enhanced photocatalytic activity is attributed to correct band alignment of the porous oxides with absorption in the UV-visible range, and ordered macro-and mesoporosity of the crystalline oxides for efficient charge transfer.
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