可见光激发二氧化钛光催化剂的研究进展

Advances of visible-light activation of TiO_2 photocatalysts

TiO_2作为一种性能优异的光催化材料已经应用于环境净化、能量存储和转换领域。尽管TiO_2与其它半导体光催化剂相比具有很多优势,但是它的宽带隙(3.2 eV)使其只能在紫外光区(≤390 nm)应用。因此,可见光催化活性TiO_2的研究开发是半导体光催化领域面临的关键技术。分析了传统TiO_2光催化剂存在的局限性,介绍了各种可见光催化活性TiO_2的研究进展,详细讨论了为提高可见光吸收和电子空穴分离,增强光催化活性,确定合适掺杂物的各种方法。对开发新型光催化剂,增强可见光区的光催化性能具有一定的参考价值。

Titanium dioxide (TiO2),as an excellent photoelectrocatalysis material,has been used extensively in the field of environmental purification and energy storage/conversion.Though there are many advantages for the TiO2 compared to other semiconductor photocatalysts,its band gap of 3.2eV restrains application to the UV-region of the electromagnetic spectrum(≤390 nm).As a result,development of visible-light active titanium dioxide is one of the key challenges in the field of semiconductor photocatalysis.In this paper,limitations of traditional TiO2 photocatalyst are analyzed.Advances of various visible-light active TiO2 photocatalysts are reviewed.Various strategies to identify appropriate dopants for improved visible-light absorption and electron-hole separation to enhance the photocatalytic activity are discussed in detail.These theoretical and experimental methods would help to develop novel catalysts to enhance the photocatalytic performance in the visible region.