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

Author:
Yan, Yabin, Yu, Yanlong, Huang, Shaolong, Yang, Yajun, Yang, Xiaodan, Yin, Shougen, Cao, Yaan
Source:
The Journal of Physical Chemistry C 2017 v.121 no.2 pp. 1089-1098
ISSN:
1932-7455
Subject:
Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, absorption, carbon dioxide, copper, energy, energy-dispersive X-ray analysis, manganese, metal ions, methane, palladium, photocatalysis, photocatalysts, photoluminescence, redox potential, sol-gel processing, titanium dioxide, ultraviolet-visible spectroscopy
Abstract:
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.
Agid:
5678495