期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 13, 页码 10342-10352出版社
AMER CHEMICAL SOC
DOI: 10.1021/am501796m
关键词
1D/3D hybrid hierarchical TiO2 composite; 3D hierarchical TiO2; titania nanotubes membrane; photocatalytic water splitting; H-2 generation; peroxotitanium complex
资金
- Korea Center for Artificial Photosynthesis (KCAP) located at Sogang University - Ministry of Education, Science, and Technology (MEST) through National Research Foundation of Korea [2009-0093885]
- National Research Foundation of Korea [22A20130012547, 2009-0093885] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Owing to unique features, hierarchical nano-structure of TiO2 has superior photocatalytic activity. In this work a facile hydrothermal route has been explored to prepare 3D hierarchical TiO2 (3D-HTiO2), 1D/3D hybrid hierarchical TiO2 composite (HHC), and 3D hierarchical protonated titanate microspheres H2Ti2O5 center dot H2O (3DHPTMS) at the expense of free-standing titania nanotube membrane (TiO2-Memb). It proceeded through the formation of peroxotitanium complex, a water-soluble Ti complex as an intermediate. Mechanism of formation, role of membrane crystallinity, and reaction parameters giving fine control on crystal structure have been investigated systematically. Photocatalytic activities were determined by measuring the amount hydrogen generated from water splitting under UV irradiation in the presence of methanol as a sacrificial reagent. Self-assembled hierarchical titania nanostructures exhibited much superior photocatalytic activity compared to that of starting material, i.e., TiO2-Memb. Enhanced photocatalytic activity is due to characteristic morphology, increased surface area, and enhanced production of photogenerated charge carriers.
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