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Ni纳米团簇修饰的板钛矿TiO2准纳米立方块的制备及其光催化产氢性能
曾 鹏1,2, 刘金雁3, 汪进明3, 彭天右*3
1.宜春学院江西省高校应用化学与化学生物学重点实验室,宜春 336000;2.肇庆学院食品和制药工程学院,肇庆 526061;3.武汉大学化学与分子科学学院,武汉 430072
摘要:
本文采用化学还原法制备了系列Ni纳米团簇(NCs)修饰的板钛矿TiO2准纳米立方块(Ni/BTN). 结果表明,Ni NCs的负载量和氧化态对Ni/BTN复合材料的光吸收、光催化活性和稳定性均存在显著的影响. 在制备的系列Ni NCs负载产物中,0.1%Ni/BTN复合材料的光催化产氢活性(156 μmol/h)最佳,为单纯的BTN产氢活性(36 μmol/h)的4.3倍. 进一步的研究结果表明,Ni NCs的超细尺寸(∽2 nm)和高分散性有利于快速捕获BTN的光生电子,从而可缩短光生电荷的传输距离和提高BTN 的光催化活性. 结果证明了板钛矿TiO2是一类潜在的高效光催化材料,为采用低成本Ni基助催化剂进一步提高其光催化性能的研究提供了重要的思路.
关键词:  板钛矿TiO2,镍纳米团簇,产氢反应,助催化剂,光催化剂
DOI:10.1063/1674-0068/cjcp1812287
分类号:
基金项目:
Fabrication of Ni Nanoclusters-Modified Brookite TiO2 Quasi Nanocubes and Its Photocatalytic Hydrogen Evolution Performance
Peng Zeng1,2, Jin-yan Liu3, Jin-ming Wang3, Tian-you Peng*3
1.Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology, Yichun University, Yichun 336000, China;2.School of Food and Pharmaceutical Engineering, Zhaoqing University, Zhaoqing 526061, China;3.College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
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.
Key words:  Brookite titania, Nickel nanocluster, Hydrogen evolution reaction, Co-catalyst, Photocatalyst