Fabrication of Ni Nanoclusters-Modified Brookite TiO2 Quasi Nanocubes and Its Photocatalytic Hydrogen Evolution Performance |
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Authors: | Peng Zeng Jin-yan Liu Jin-ming Wang Tian-you Peng |
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Affiliation: | 1.Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology, Yichun University, Yichun 336000, China;School of Food and Pharmaceutical Engineering, Zhaoqing University, Zhaoqing 526061, China2.College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China |
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Abstract: | The development of low-cost, earth-abundant and highly-efficient cocatalysts is still important to promote the photocatalytic H2 evolution reaction over semiconductors. Herein, a series of Ni nanoclusters (NCs) modified brookite TiO2 quasi nanocubes (BTN) (marked as Ni/BTN) are fabricated via a chemical reduction process. It is found that the loading content and oxidation state of Ni NCs can significantly influence the optical absorption, photocat-alytic activity, and stability of Ni/BTN composites. Among the resultant Ni NCs-loaded products, 0.1%Ni/BTN composite delivers the best H2 evolution activity (156 μmol/h), which is 4.3 times higher than that of the BTN alone (36 μmol/h). Furthermore, the Ni NCs with ultra ne size (∽2 nm) and high dispersity enable shorter charge transfer distance by quickly capturing the photoexcited electrons of BTN, and thus result in the improved activity even though the oxidization of some Ni NCs on BTN is harmful to the activity for H2 evolution due to the much lower electron capturing capability of NiO than metallic Ni. This study not only clari es that brookite TiO2 would be a promising high-efficient photo-catalyst for H2 evolution, but also reveals vital clues for further improving its photocatalytic performance using low-cost Ni-based cocatalyst. |
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Keywords: | Brookite titania Nickel nanocluster Hydrogen evolution reaction Co-catalyst Photocatalyst |
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