A_2BO_4尖晶石类催化剂在紫外可见光水氧化的研究

Visible Light-driven Water Oxidation with Spinel as Photocatalysts

采用溶胶-凝胶法制备La_xSr_(2-x)MnO_4尖晶石类光催化剂,确定了适用于La_xSr_(2-x)MnO_4的制备方法和条件,通过改变结构和组分实现光催化水氧化反应。实验表明,晶体的缺陷和晶格的变形影响光催化性能且x为0.3~0.6时都表现良好的催化活性,Na_2S_2O_8浓度过高不利于催化性能,可能发生其它的副反应。利用X-射线衍射(XRD)法,气相色谱(GC)法、电化学循环伏安法、极化曲线法、X射线光电子能谱分析(XPS)法对结构和其催化性能进行表征。

LaxSr2-xMnO4 powders were prepared by sol-gel method. Major progress on the development of spinel-based alternative photoeatalyst Lax Sr2 -x MnO4 for water splitting has been realized with help of modification arising from influence of conformation and chemical characteristics of A2 BO4 material. The results of A2BO4 in photo catalytic activity demonstrated the encouraging prospects in crystal defects and crystal structure, offering a guild of structure relationship and activity in A2BO4 photocatalyst. LaxSr2-xMnO4 was proved to be an excellent photocatalyst for overall water oxidation under UV irradiation due to good stability and suitable band-edge position.