多孔分等级锡酸锌/窄带隙硫化物异质结构的合成、能带调控及光催化活性增强机理研究

项目名称： 多孔分等级锡酸锌/窄带隙硫化物异质结构的合成、能带调控及光催化活性增强机理研究

项目编号： No.U1304520

项目类型： 联合基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 贾铁昆

作者单位： 洛阳理工学院

项目金额： 29万元

中文摘要： 利用光催化技术解决环境污染和能源短缺难题是材料科学研究领域的热点问题，单相宽带隙半导体催化材料光生电子和空穴迁移速率低，复合几率高，量子效率低，导致光催化效率低。因此，发展新型、高效和可见光响应的光催化材料是解决环境污染和能源短缺难题的关键环节。纳米半导体异质结构能够拓宽光谱响应范围，加快光生载流子的分离速度和提高光催化反应过程中的量子效率，具有广泛的应用前景。本项目选择锡酸锌/窄带隙硫化物组合体系，采用二步水热/溶剂热结合超声的方法合成多孔分等级异质结构可见光催化剂，研究制备条件对产物结构与光催化性能的影响，阐明纳米半导体异质结能带调控机理，通过对异质材料能带结构以及光催化反应过程中动力学的深入研究，建立微观结构和能带协同调控与光催化活性的本质联系，并揭示光催化效率提高的机理。

中文关键词： 锡酸锌/硫化物；异质结；分等级结构；能带调控；光催化性能

英文摘要： Photocatalytic technique has been attracting increasingly interests in the field of materials science, which is considered to the key for the treatment of environment pollution and energy shortage. Single wide bandgap energy semiconductor exhibits poor photocatalytic activity due to their low photogenerated carriers transfer rate, high recombination rate and low quantum efficiency. Therefore, it is critical to develop novel photocatalysts with high efficiency and visible light response. Semiconductor heterostructure are regarded as a candidate for widening the spectral response, enhancing the separate rate of photocarriers and improving the quantum efficiency. In this work, porous Zn2SnO4/narrow band-gap sulphide hierarchical heterostructures visible-light driven photocatalysts are synthesized via a two step hydrothermal/solvothermal technique assisting by ultrasonic method. The effect of the processing conditions on the structures and photocatalytic activities of the products will be investigated in details. The band gap energy tuning mechanism of Zn2SnO4/narrow band-gap sulphide hierarchical hierarchical heterostructures will be illustrated to explain the improvement of photocatalytic activity. The intrinsic connection will be established between the microstructures and band gap energy tuning and the photocata

英文关键词： Zn2SnO4 /sulphide；heterostructures；hierarchical architectures；band-gap energy tuning；photocatalytic activity