材料科学
制氢
光催化
氢
纳米复合材料
可见光谱
载流子
催化作用
X射线光电子能谱
漫反射
分析化学(期刊)
光诱导电荷分离
带隙
分解水
光电子学
光化学
化学工程
纳米技术
化学
光学
人工光合作用
工程类
有机化学
物理
生物化学
色谱法
作者
Fenglong Wang,Zuanming Jin,Yijiao Jiang,Ellen H. G. Backus,Mischa Bonn,Shi Nee Lou,Dmitry Turchinovich,Rose Amal
标识
DOI:10.1016/j.apcatb.2016.05.048
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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