In2S3/Pt-TiO2纳米复合材料增强型可见光光催化制氢的电荷分离过程探讨
Probing the Charge Separation Process on In2S3/Pt-TiO2 Nanocomposites for Boosted Visible-light Photocatalytic Hydrogen Production
摘要：
采用简单的湿化学方法制备了可见光照射下的In2S3/Pt-TiO 2多相催化剂。当Pt-TiO 2与In2S3的质量比为2时，复合催化剂的产氢量最高，比原位沉积的Pt-In 2S3提高了82倍。紫外-可见漫反射光谱和价带X射线光电子能谱表明，In2S3的导带比TiO2的导带负0.3 eV，有利于纳米复合材料中的电荷分离。光电化学瞬态光电流测量和光泵-太赫兹探针光谱研究进一步证实了In2S3/Pt-TiO 2中的电荷分离。发现光致电子从In2S3导带迁移到TiO2导带并随后迁移到Pt纳米颗粒中发生在5皮秒内。基于实验证据，提出了电荷分离过程，这占的In2S3/Pt-TiO2复合催化剂表现出的增强的活性。
英文摘要：
A simple refluxing wet-chemical approach is employed for fabricating In2S3/Pt-TiO2 heterogeneous catalysts for hydrogen generation under visible light irradiation. When the mass ratio between Pt-TiO2 and cubic-phased In2S3 (denoted as In2S3/Pt-TiO2) is two, the composite catalyst shows the highest hydrogen production, which exhibits an 82-fold enhancement over in-situ deposited Pt-In2S3. UV-vis diffuse reflectance and valence band X-ray photoelectron spectra elucidate that the conduction band of In2S3 is 0.3 eV more negative compared to that of TiO2, favoring charge separation in the nanocomposites. Photoelectrochemical transient photo-current measurements and optical pump - terahertz probe spectroscopic studies further corroborate the charge separation in In2S3/Pt-TiO2. The migration of photo-induced electrons from the In2S3 conduction band to the TiO2 conduction band and subsequently into the Pt nanoparticles is found to occur within 5 picoseconds. Based on the experimental evidence, a charge separation process is proposed which accounts for the enhanced activity exhibited by the In2S3/Pt-TiO2 composite catalysts.
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