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Fabrication of Ni Nanoclusters-Modified Brookite TiO2 Quasi Nanocubes and Its Photocatalytic Hydrogen Evolution Performance
彭天右
作者单位E-mail
彭天右 武汉大学 typeng@whu.edu.cn 
摘要:
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) (denoted 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, photocatalytic activity and stability of Ni/BTN composites. Among the Ni NCs-loaded products, 0.1% Ni/BTN composite achieves the best H2 evolution activity (156 μmol h-1), which is 4.3 times higher than that (36 ?mol h-1) of single BTN. Further investigations demonstrate that the Ni NCs with ultrafine size (?2 nm) and high dispersity favor a shorter charge transfer pathway by quickly capturing the photogenerated electrons of BTN, and thus cause the improved activity even though the oxidization process of some Ni NCs on BTN is harmful to the activity for H2 evolution due to the much lower electron capture ability of NiO than metallic Ni. The present results not only demonstrate that brookite TiO2 would be a potential photocatalyst for efficient H2 evolution, but also provide some vital clues for further improving its photocatalytic performance using low-cost Ni-based cocatalyst.
关键词:  Brookite titania  Nickel nanocluster  Hydrogen evolution reaction  Co-catalyst  Photocatalyst
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Fabrication of Ni Nanoclusters-Modified Brookite TiO2 Quasi Nanocubes and Its Photocatalytic Hydrogen Evolution Performance
Peng Tian-You
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) (denoted 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, photocatalytic activity and stability of Ni/BTN composites. Among the Ni NCs-loaded products, 0.1% Ni/BTN composite achieves the best H2 evolution activity (156 μmol h-1), which is 4.3 times higher than that (36 ?mol h-1) of single BTN. Further investigations demonstrate that the Ni NCs with ultrafine size (?2 nm) and high dispersity favor a shorter charge transfer pathway by quickly capturing the photogenerated electrons of BTN, and thus cause the improved activity even though the oxidization process of some Ni NCs on BTN is harmful to the activity for H2 evolution due to the much lower electron capture ability of NiO than metallic Ni. The present results not only demonstrate that brookite TiO2 would be a potential photocatalyst for efficient H2 evolution, but also provide some vital clues for further improving its photocatalytic performance using low-cost Ni-based cocatalyst.
Key words:  Brookite titania  Nickel nanocluster  Hydrogen evolution reaction  Co-catalyst  Photocatalyst