Adjustment and Matching of Energy Band of TiO2-Based Photocatalysts by Metal Ions (Pd, Cu, Mn) for Photoreduction of CO2 into CH4

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• 作者：Yabin Yan ; Yanlong Yu ; Shaolong Huang ; Yajun Yang ; Xiaodan Yang ; Shougen Yin ; Yaan Cao
• 刊名：Journal of Physical Chemistry C
• 出版年：2017
• 出版时间：January 19, 2017
• 年：2017
• 卷：121
• 期：2
• 页码：1089-1098
• 全文大小：683K
• ISSN：1932-7455

文摘

A series of the metal ions (Pd, Cu, and Mn) modified TiO₂ photocatalysts are synthesized via simple sol–gel method. Characterized by X-ray diffraction, Raman, UV–vis absorption spectra, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, time-resolved photoluminescence (PL) decay curves, and PL, it was revealed these introduced metal ions existed as O–Me–O species (Me: Pd, Cu, and Mn) on the surface of TiO₂. The corresponding theory calculation is used to investigate the electronic density of states and band structure of the metal ions (Pd, Cu, and Mn) modified TiO₂. The modified TiO₂ photocatalysts exhibit an improved photocatalytic performance on reduction of CO₂ and H₂O into methane (CH₄), attributed to the contribution of surface species by enhancing the visible absorption efficiently, separating charge carriers, and matching of the redox potential on the photoreduction of CO₂ into CH₄. This article could provide a wider understanding about the adjustment and matching of the energy level for the synthesis and design of functional materials with excellent photocatalytic performance.