W_(18)O_(49)/C-TiO_(2)直接Z型光催化剂的制备及光解水制氢性能

Preparation of W_(18)O_(49)/C-TiO_(2) direct Z-scheme photocatalyst and photocatalytic water splitting for H_(2) production

采用水热法制备W_(18)O_(49)/C-TiO_(2)直接Z型光催化剂。使用XRD,SEM,TEM,HRTEM,PL等测试手段对样品的结构、形貌、光生载流子的输运特性及能带结构进行表征。在模拟太阳光照射下,不添加任何牺牲剂,研究样品的光解水制氢性能及其量子效率。结果表明:W_(18)O_(49)/C-TiO_(2)直接Z型光催化剂的构建显著提高催化剂的光吸收性能,加速光生电荷的分离和传输,使更多的光生电子参与光催化还原反应,从而使样品具有高效的光催化活性。光解水制氢测试显示,W_(18)O_(49)/C-TiO_(2)直接Z型异质结在模拟太阳光照射下,在不添加任何牺牲剂的条件下,产氢速率达209μmol·h^(-1)·g^(-1),并具有较强的光催化稳定性,在24 h的循环测试中,产氢量保持不变。

W_(18)O_(49)/C-TiO_(2) direct Z-scheme photocatalyst was prepared by a simple hydrothermal method.The structure,morphology,transport properties of photogenerated carriers and energy band structure were characterized by XRD,SEM,TEM,HRTEM,PL and other measurements.Under simulated sunlight illumination,the photocatalytic water splitting performance for hydrogen(H_(2))production and quantum efficiency were studied without adding any sacrificial agent.The results show that the construction of W_(18)O_(49)/C-TiO_(2) direct Z-scheme photocatalyst can significantly improve light absorption,accelerate the separation and transport of photogenerated carriers,and enable more photogenerated electrons participate in the photocatalytic reduction reaction,so the sample possesses high efficient photocatalytic activity.The photocatalytic H_(2) production tests show that under simulated sunlight illumination,the W_(18)O_(49)/C-TiO_(2) direct Z-scheme heterojunction can achieve H_(2) production rate of 209μmol·h^(-1)·g^(-1) without adding any sacrificial agents.It also exhibits strong photocatalytic stability;the H_(2) production remains unchanged during the 24 h cycle test.