Three-dimensional Gd-doped TiO2 fibrous photoelectrodes for efficient visible light-driven photocatalytic performance

Title
Three-dimensional Gd-doped TiO2 fibrous photoelectrodes for efficient visible light-driven photocatalytic performance
Author(s)
송태섭Junghyun Choi[Junghyun Choi]P. Sudhagar[P. Sudhagar]P. Lakshmipathiraj[P. Lakshmipathiraj]Jung Woo Lee[Jung Woo Lee]Anitha Devadoss[Anitha Devadoss]Sangkyu Lee[Sangkyu Lee]Seungki Hong[Seungki Hong]S. Eito[S. Eito]C. Terashima[C. Terashima]Tae Hee Han[Tae Hee Han]Jeung Ku Kang[Jeung Ku Kang]A. Fujishima[A. Fujishima]Yong Soo Kang[Yong Soo Kang]Ungyu Paik[Ungyu Paik]
Keywords
INTERPARTICLE CHARGE-TRANSFER; NANOTUBE ARRAYS; ASPECT RATIOS; DEGRADATION; NANOPARTICLES; NANOFIBER; NANORODS; PHENOL; ABSORPTION; OXIDATION
Issue Date
201401
Publisher
ROYAL SOC CHEMISTRY
Citation
RSC ADVANCES, v.4, no.23, pp.11750 - 11757
Abstract
To elucidate the influence of electrode geometry on the photocatalytic performance of TiO2, herein, we report the synthesis of three-dimensional in situ Gd-doped TiO2 nanofibers (TiO2-NFs) using a simple electrospinning technique. The as-spun pristine TiO2-NFs show a higher photocatalytic (PC) activity (k = 0.013 m(-1)) than the TiO2 nanoparticles (TiO2-NPs) (k = 0.006 m(-1)) electrode, which could be attributed to the fast electron transport in the 1D NFs. In addition, Gd-doped TiO2-NFs show nearly five-fold enhancement in the PC degradation rate due to synergistically higher electron transport and production of HO center dot due to the effects of morphology and doping, respectively. In striking contrast, Gd-doping has no influence on the PC activity of TiO2-NPs due to increased grain boundaries, signifying the vital role of the electrode architecture. The mechanism of Gd doping in pure anatase TiO2 is investigated using density functional theory (DFT) calculations. The influence of Gd-doping and the electrode architecture on the charge recombination and flat-band potential variation in TiO2 are discussed elaborately using ultraviolet photoelectron spectroscopy (UPS) and Mott-Schottky analysis, and the implications of these findings for designing doped 3D fibrous photoelectrodes are discussed.
URI
http://hdl.handle.net/YU.REPOSITORY/33550http://dx.doi.org/10.1039/c3ra46851h
ISSN
2046-2069
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공과대학 > 신소재공학부 > Articles
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