Core–Shell Vanadium Modified Titania@β-In2S3 Hybrid Nanorod Arrays for Superior Interface Stability and Photochemical Activity

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• 作者：Asad Mumtaz ; Norani Muti Mohamed ; Muhammad Mazhar ; Muhammad Ali Ehsan ; Mohamed Shuaib Mohamed Saheed
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：April 13, 2016
• 年：2016
• 卷：8
• 期：14
• 页码：9037-9049
• 全文大小：904K
• 年卷期：0
• ISSN：1944-8252

文摘

Core–shell rutile TiO₂@β-In₂S₃ and modified V-TiO₂@β-In₂S₃ were synthesized to develop bilayer systems to uphold charge transport via an effective and stable interface. Morphological studies revealed that β-In₂S₃ was deposited homogeneously on V-TiO₂ as compared to unmodified TiO₂ nanorod arrays. X-ray photoelectron spectroscopy (XPS) and electron energy loss spectrometry studies verified the presence of various oxidation states of vanadium in rutile TiO₂ and the vanadium surface was utilized for broadening the charge collection centers in host substrate layer and hole quencher window. Subsequently, X-ray diffraction, high-resolution transmission electron microscopy, and Raman spectra confirmed the rutile phases of TiO₂ and modified V-TiO₂ along with the phases of crystalline β-In₂S₃. XPS valence band study explored the interaction of valence band quazi Fermi levels of β-In₂S₃ with the conduction band quazi Fermi levels of modified V-TiO₂ for enhanced charge collection at the interface. Photoelectrochemical studies show that the photocurrent density of V-TiO₂@β-In₂S₃ is 1.42 mA/cm² (1.5AM illumination). Also, the frequency window for TiO₂ was broadened by the vanadium modification in rutile TiO₂ nanorod arrays, and the lifetime of the charge carrier and stability of the interface in V-TiO₂@β-In₂S₃ were enhanced compared to the unmodified TiO₂@β-In₂S₃. These findings highlight the significance of modifications in host substrates and interfaces, which have profound implications on interphase stability, photocatalysis and solar-fuel-based devices.