Eosin Y-sensitized nanosheet-stacked hollow-sphere TiO2 for efficient photocatalytic H2 production under visible-light irradiation
Nanosheet (with around 20 nm in thickness)-stacked hollow-sphere TiO2 was synthesized via a modified solvothermal reaction for different times followed by calcination treatment at different temperatures. After surface modification by different cations (H+ or Fe3+) and further sensitization by Eosin Y, the obtained photocatalysts achieved remarkably enhanced H2-production activity (about 4.2 times of that for Eosin Y-sensitized P25) and stability under visible-light irradiation. The improved photocatalytic performance was synergistically caused by the enhanced Eosin Y sensitization (due to the enlarged surface area and electropositively modified surface), the optimized crystal structure (well-crystallized anatase phase), and the unique micro/nanostructure (nanosheet-stacked hollow spheres). This work presented an effective route to explore new visible-light-driven H2-production photocatalysts by coupling nanomaterials with special morphologies and metal-free dyes with visible-light absorption.
KeywordsEosin Y Hydrogen Photocatalysis Sensitization Titania Visible light
This work was supported by the National Natural Science Foundation of China (Nos. 51302212, 51236007 and 51323011), the China Postdoctoral Science Foundation (Nos. 2014T70915, 2013M540745, and 2013M542343), the Natural Science Basic Research Plan in Shaanxi Province of China (No. 2014JQ2-5022), the Postdoctoral Science Foundation in Shaanxi Province of China, and the Fundamental Research Funds for the Central Universities (Nos. 2013jdhz20 and xjj2013004).
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