利用Bi₄Ti₃O₁₂和TiO₂的结构相似性，以TiO₂纳米片为原料，用水热法制备了Bi₄Ti₃O₁₂/TiO₂异质结，并通过X射线衍射、扫描电子显微镜和高分辨透射电镜等证实了异质结结构的形成。可见光催化反应活性的表征说明Bi₄Ti₃O₁₂/TiO₂异质结结构相较于TiO₂或Bi₄Ti₃O₁₂性能有明显提高，光电化学表征进一步证实Bi₄Ti₃O₁₂/TiO₂异质结结构能有效促进光生电子-空穴对的分离。实验结果还表明，这种增强作用与两相的比例密切相关，并通过控制两相比例对性能进行了优化。

By means of the similar structures between Bi₄Ti₃O₁₂ and TiO₂,the Bi₄Ti₃O₁₂/TiO₂ heterojunction is made by the hydrothermal method using TiO₂ nano sheets as raw materials.The formation of heterojunction structure is confirmed by X ray diffraction,scanning electron microscopy and high-resolution transmission electron microscopy.The characterization of visible light catalytic activity shows that the performances of the Bi₄Ti₃O₁₂/TiO₂ heterojunction structure are significantly improved compared to TiO₂ or Bi₄Ti₃O₁₂.The photoelectrochemical characterization further confirms the Bi₄Ti₃O₁₂/TiO₂ heterojunction structure can effectively promote the separation of photogenerated electron and hole pairs.The experimental results also show that the enhancement is closely related to the ratio between two phases,so that the performance is optimized by controlling the phase ratio.

李言(1992-),男,硕士研究生,研究方向为陶瓷材料,liyan7@mail.ustc.edu.cn