title: Improved Solar-Driven Photocatalytic Performance of Highly Crystalline Hydrogenated TiO2Nanofibers with Core-Shell Structure.
abstract: Hydrogenated titanium dioxide has attracted intensive research interests in pollutant removal applications due to its high photocatalytic activity. Herein, we demonstrate hydrogenated TiO2nanofibers (H:TiO2NFs) with a core-shell structure prepared by the hydrothermal synthesis and subsequent heat treatment in hydrogen flow. H:TiO2NFs has excellent solar light absorption and photogenerated charge formation behavior as confirmed by optical absorbance, photo-Kelvin force probe microscopy and photoinduced charge carrier dynamics analyses. Photodegradation of various organic dyes such as methyl orange, rhodamine 6G and brilliant green is shown to take place with significantly higher rates on our novel catalyst than on pristine TiO2nanofibers and commercial nanoparticle based photocatalytic materials, which is attributed to surface defects (oxygen vacancy and Ti3+interstitial defect) on the hydrogen treated surface. We propose three properties/mechanisms responsible for the enhanced photocatalytic activity, which are: (1) improved absorbance allowing for increased exciton generation, (2) highly crystalline anatase TiO2that promotes fast charge transport rate, and (3) decreased charge recombination caused by the nanoscopic Schottky junctions at the interface of pristine core and hydrogenated shell thus promoting long-life surface charges. The developed H:TiO2NFs can be helpful for future high performance photocatalysts in environmental applications.
authors.affiliation: Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan.|Center for Reliability Sciences &Technologies, Chang Gung University, Taoyuan 33302, Taiwan.|Division of Neonatology, Department of Pediatrics, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan.
authors.forename: Ming-Chung
authors.initials: MC
authors.lastname: Wu
authors.affiliation: Sustainable Energy Development Center, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
authors.forename: Ching-Hsiang
authors.initials: CH
authors.lastname: Chen
authors.affiliation: Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
authors.forename: Wei-Kang
authors.initials: WK
authors.lastname: Huang
authors.affiliation: Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
authors.forename: Kai-Chi
authors.initials: KC
authors.lastname: Hsiao
authors.affiliation: Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
authors.forename: Ting-Han
authors.initials: TH
authors.lastname: Lin
authors.affiliation: Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
authors.forename: Shun-Hsiang
authors.initials: SH
authors.lastname: Chan
authors.affiliation: Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
authors.forename: Po-Yeh
authors.initials: PY
authors.lastname: Wu
authors.affiliation: Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Chun-Fu
authors.initials: CF
authors.lastname: Lu
authors.affiliation: Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
authors.forename: Yin-Hsuan
authors.initials: YH
authors.lastname: Chang
authors.affiliation: Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
authors.forename: Tz-Feng
authors.initials: TF
authors.lastname: Lin
authors.affiliation: Division of Neonatology, Department of Pediatrics, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan.
authors.forename: Kai-Hsiang
authors.initials: KH
authors.lastname: Hsu
authors.affiliation: Division of Neonatology, Department of Pediatrics, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan.
authors.forename: Jen-Fu
authors.initials: JF
authors.lastname: Hsu
authors.affiliation: Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan.
authors.forename: Kun-Mu
authors.initials: KM
authors.lastname: Lee
authors.affiliation: Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.|Research Center for Applied Science, Academia Sinica, Taipei 11529, Taiwan.
authors.forename: Jing-Jong
authors.initials: JJ
authors.lastname: Shyue
authors.affiliation: Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, FI-90570 Oulu, Finland.
authors.forename: Krisztián
authors.initials: K
authors.lastname: Kordás
authors.affiliation: Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Wei-Fang
authors.initials: WF
authors.lastname: Su