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Hydrogen Production by Photocatalytic Water Splitting over Pt/TiO2 Nanosheets with Exposed (001) Facets
被引:1093
作者:
Yu, Jiaguo
[1
]
Qi, Lifang
[1
]
Jaroniec, Mietek
[2
]
机构:
[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China
[2] Kent State Univ, Dept Chem, Kent, OH 44242 USA
基金:
中国国家自然科学基金;
关键词:
SOL-GEL METHOD;
VISIBLE-LIGHT;
TITANIUM(IV) OXIDE;
TIO2;
POWDERS;
THIN-FILMS;
ENVIRONMENTAL APPLICATIONS;
SURFACE FLUORINATION;
SINGLE-CRYSTALS;
ANATASE;
TITANIA;
D O I:
10.1021/jp104488b
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
Pt/TiO2 nanosheets with exposed (001) facets were fabricated by a simple hydrothermal route in a Ti(OC4H9)(4)-HF-H2O mixed solution followed by a photochemical reduction deposition of Pt nanoparticles on TiO2 nanosheets under xenon lamp irradiation. The prepared samples were characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, nitrogen adsorption-desorption isotherms, UV-vis diffuse reflectance spectroscopy, and photoluminescence (PL) spectroscopy. Production of (OH)-O-center dot radicals on the TiO2 surface was detected by the PL technique using coumarin as a probe molecule. The effects of Pt loading on the rates of photocatalytic hydrogen production of the as-prepared samples in ethanol aqueous solution were investigated and discussed. The results showed that the photocatalytic hydrogen production rates of TiO2 nanosheets from the ethanol aqueous solutions were significantly enhanced by loaded Pt on the TiO2 nanosheets, and the latter with a 2 wt % of deposited Pt exhibited the highest photocatalytic activity. All fluorinated TiO2 nanosheets exhibited much higher photocatalytic activity than Degussa P25 TiO2 and pure TiO2 nanoparticles prepared in pure water due to the synergistic effect of surface fluorination and exposed (001) facets.
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页码:13118 / 13125
页数:8
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