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Fabrication of mixed-crystalline-phase spindle-like TiO2 for enhanced photocatalytic hydrogen production

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Abstract

The fabrication of heterojunction between different crystalline phases has been considered to be an effective strategy for promoting charge separation during photocatalytic process. Herein, the mixed-crystalline-phase (MC), spindle-like TiO2 was prepared with a simple hydrothermal method, which was followed by a series of calcination processes. The final products are composed of two crystalline phases including anatase and brookite. The anatase/brookite ratio of the TiO2 is tuned by varying the calcination temperature. The MC TiO2 that consisted of 85.5% anatase and 14.5% brookite has the highest rate of photocatalytic hydrogen evolution (290.2 μmol h−1) compared to the purely anatase TiO2. This is attributed to the mixed-phase heterojunction structure that improves electron-hole separation, and therefore, enhances the photocatalytic hydrogen production.

摘要

本文采用一种简单的方法制备了混晶相(锐钛矿/板钛矿)纺锤形二氧化钛. 首先, 硫酸氧钛被选择为前驱体, 通过水热合成以及惰性气氛下的热处理过程, 得到一系列混晶相(锐钛矿/板钛矿)二氧化钛, 其中, 组成为85.5%锐钛矿、 14.5%板钛矿的二氧化钛具有最优异的光催化分解水制氢活性, 产氢速率为290.2 μmol h−1. 研究发现锐钛矿/板钛矿晶相间异质结的存在能够有效的分离光生载流子, 同时进一步提高对电子的捕获, 实现光催化分解水制氢效率的显著提高, 这种基于硫酸氧钛水热合成方法得到的高活性光催化剂在制氢领域具有潜在的应用价值.

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Authors and Affiliations

  1. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of China, Heilongjiang University, Harbin, 150080, China

    Rong Hao, Baojiang Jiang, Mingxia Li, Ying Xie & Honggang Fu

Authors
  1. Rong Hao
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  2. Baojiang Jiang
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  3. Mingxia Li
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  4. Ying Xie
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  5. Honggang Fu
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Corresponding authors

Correspondence to Baojiang Jiang or Honggang Fu.

Additional information

Rong Hao obtained her BSc degree from Heilongjiang University in 2013. Now she is a graduate student in Professor Honggang Fu’s research group. Her current research interests are the design and synthesis of TiO2 heterojunction structures for photocatalytic hydrogen production.

Honggang Fu obtained his BSc degree in 1984 and MSc degree in 1987 from Jilin University. He then joined Heilongjiang University as an assistant professor. In 1999, he obtained his PhD degree from Harbin Institute of Technology. He became a full professor in 2000. Currently, he is the Cheung Kong Scholar Professor. His current research interests are oxide-based semiconductor nanomaterials for solar energy conversion and photocatalysis, and crystalline carbon-based nanomaterials for energy conversion and storage. This includes their design, synthesis, and physical and chemical properties. To date, he has published more than 260 peer-reviewed papers as the corresponding author, which have over 4500 citations.

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Hao, R., Jiang, B., Li, M. et al. Fabrication of mixed-crystalline-phase spindle-like TiO2 for enhanced photocatalytic hydrogen production. Sci. China Mater. 58, 363–369 (2015). https://doi.org/10.1007/s40843-015-0052-3

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  • DOI: https://doi.org/10.1007/s40843-015-0052-3

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