C=N诱导TiO_(2)表面富电子结构及其光催化性能

C=N-induced electron-rich structure on TiO_(2) surface and its photocatalytic properties

引入3种不同的吡啶类化合物调控TiO_(2)表面结构并利用其分子中C=N不饱和键的吸电子作用,使TiO_(2)表面电子富集,提升金红石TiO_(2)的光催化能力。通过扫描电镜(SEM)、X射线光电子能谱仪(XPS)、瞬态光电流响应(i-t)、紫外-可见光(UV-Vis)等手段,研究表面富电子结构对TiO_(2)纳米棒的微观形貌、表面电子结构、表面能带结构和光电化学响应能力方面及其对光解水性能的影响。结果表明:C=N的缺电子结构为催化剂表面电子富集提供场所,使光生载流子迁移路径增加,有利于光生电子-空穴对的分离,使其禁带宽度减小,有效地提升催化剂的光响应能力。其中TiO_(2)-PD具有较高的产氢速率,产氢性能可达39mmol/(g·h)。

Three different pyridine compounds were introduced to control the surface structure of TiO_(2),and utilizing the electron-withdrawing effect of the C=N unsaturated bonds in the molecules enriched the electrons on the TiO_(2) surface,thereby enhancing the photocatalytic ability of rutile TiO_(2).By means of SEM,XPS,i-t,UV-Vis and other characterization methods,the effects of the surface electron-rich structure on the microscopic morphology,surface electronic structure,surface energy band structure and photoelectrochemical responsiveness of TiO_(2) nanorods,as well as its effect on photodegradation performance of water were studied.The results showed that the electron-deficient structure of C=N provided sites for electron enrichment on the surface of the catalyst,which increased the migration path of photogenerated carriers,was conducive to the separation of photogenerated electron-hole pairs,and reduced the forbidden band width,thus effectively improving the photoresponsive ability of the catalyst.Among them,TiO_(2)-PD had a high hydrogen production rate,and the hydrogen production performance could reach 39 mmol·g^(-1)·h^(-1).