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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.

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