期刊
SCIENCE OF ADVANCED MATERIALS
卷 5, 期 11, 页码 1563-1570出版社
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/sam.2013.1673
关键词
TiO2 Nano-Tube Array Photoelectrode; Photocatalysis; Anodization; Photoconversion Efficiency; Methyl Blue
资金
- Fundamental Research Funds for the Central Universities [TD-JC-2013-3]
- National Natural Science Foundation of China [50978066, 51178138]
- National Creative Research Groups of China [51121062]
- State Key Laboratory of Urban Water Resources and Environment [2010DX03]
- Program for New Century Excellent Talents in University [NCET-12-0787]
- Key Laboratory of Functional Inorganic Material Chemistry (Heilongjiang University), Ministry of Education
In this study, highly ordered TiO2 nano-tube arrays (TiO2 NTAs) photoelectrodes were prepared through anodization in the presence of glycerol. The resulting samples were characterized by SEM, XRD, UV-vis DRS and PL spectra. All results showed that TiO2 NTAs samples annealed at 773 K exhibited the highest photocatalytic (PC) activity for the degradation of methyl blue (MB). In addition, the roles of MB on the enhancement of photoelectrocatalytic (PEC) properties of TiO2 NTAs photoanode were investigated through photocurrent response and photoconversion efficiency. As a result, optimized TiO2 NTAs photoanode exhibited high photoinduced current of 0.48 mA.cm(-2), photoconversion efficiency of 0.28% and PEC efficiency of 83% with the existing of MB as sacrificial agent and probe molecules. The high PC and PEC activities could mainly be attributed to the intense light absorption, high separation efficiency of photoinduced charge carriers. Moreover, the contribution of different reactive species on the degradation of MB solution was distinguished in detail. Furthermore, the enhanced visible light PC mechanism was proposed.
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