等离子体Ag/介孔黑TiO_(2)空心球用于可见光催化制氢

Plasmon Ag/mesoporous black TiO_(2) hollow spheres for visible light photocatalytic hydrogen evolution

以介孔黑二氧化钛空心球为模板,通过真空诱导辅助热还原方法在介孔黑TiO_(2)空心球孔道及表面生长等离子体Ag纳米粒子,制备了等离子体Ag/介孔黑TiO_(2)空心球可见光催化剂。用XRD、UV-Vis、SEM、TEM和XPS等多种表征手段对Ag/介孔黑TiO_(2)空心球进行了详细的结构表征。结果表明,表面Ag粒子的存在显著提升了该复合材料的表面等离子体共振(SPR)效应,使得复合材料在可见光区的吸收增强,从而提高了太阳光的利用率;适量的Ag粒子有利于光生电荷迁移与分离。相比于介孔黑TiO_(2)空心球,等离子体Ag/介孔黑TiO_(2)空心球在模拟太阳光AM1.5G和可见光下的光催化产氢性能显著提升。

Plasmon Ag/mesoporous black TiO_(2) hollow spheres are prepared by vacuum induction assistant-thermal reduction method with mesoporous black TiO_(2) hollow spheres as the host and anchoring Ag nanoparticles on the surface and in the pores.The plasmon Ag/mesoporous black TiO_(2) hollow spheres are characterized in detail by XRD,UV-Vis,SEM,TEM and XPS.The results show that the highly dispersed Ag nanoparticles show strong surface plasmon resonance(SPR)effect,which enhances the absorption of visible light and increases the utilization ratio of solar light.In addition,suitable Ag nanoparticles favor the separation and transfer of photogenerated charge carriers.The photocatalytic hydrogen production performances of plasmon Ag/mesoporous black TiO_(2) hollow spheres under AM1.5G and visible light irradiation are both promoted obviously compared with mesoporous black TiO_(2) hollow spheres.