Band-gap engineering of BiOCl with oxygen vacancies for efficient photooxidation properties under visible-light irradiation
Band-gap engineering of BiOCl with oxygen vacancies for efficient photooxidation properties under visible-light irradiation
复制标题
具有氧空位的 BiOCl 的带隙工程在可见光照射下具有高效的光氧化性能
DOI：
10.1039/c7ta09897a
复制
发表时间：
2018-02-07
影响因子：
11.9
通讯作者：
Hao, Weichang
中科院分区：
文献类型：
--
作者：
Cui, Dandan;Wang, Liang;Hao, Weichang
理解氧空位在决定半导体可见光氧化性能中的作用仍然是一个巨大的挑战。在此，BiOCl与氧空位被认为是一个很好的模型来研究氧空位和光氧化性能之间的关系。采用溶剂热法合成了具有丰富氧空位的BiOCl纳米片。理论和实验结果表明，在BiOCl的禁带中引入氧空位后，出现了新的电子施主能级，使BiOCl的吸收从紫外区扩展到可见区。正如预期的那样，具有氧空位的BiOCl纳米片表现出可见光驱动的光催化活性。此外，具有丰富的氧空位的BiOCl比具有少量氧空位的BiOCl具有更高的可见光光电流和更有效的光生电荷分离和传输。在半导体材料表面引入氧空位是提高光催化剂可见光氧化活性的一条有效途径。
It remains a great challenge to understand the role of oxygen vacancies in determining the photooxidation properties of semiconductors under visible-light irradiation. Herein, BiOCl with oxygen vacancies is proposed as an excellent model to study the relationship between oxygen vacancies and photooxidation properties. BiOCl nanosheets with abundant oxygen vacancies are synthesized via a facile solvothermal route. Theoretical and experimental results reveal that after the introduction of oxygen vacancies, a new electron donor level appears in the band gap of BiOCl, extending the absorption from the ultraviolet to the visible regime. As expected, BiOCl nanosheets with oxygen vacancies exhibit visible-light-driven photocatalytic activity towards oxygen evolution. In addition, BiOCl with abundant oxygen vacancies exhibits a higher visible-light photocurrent and more efficient photoinduced charge separation and transportation than BiOCl with a small number of oxygen vacancies. The introduction of oxygen vacancies on the surfaces of semiconductors provides a promising way to improve the visible-light photooxidation activity of photocatalysts.