University of Oulu

Wu, M.-C. et al. Improved Solar-Driven Photocatalytic Performance of Highly Crystalline Hydrogenated TiO2 Nanofibers with Core-Shell Structure. Sci. Rep. 7, 40896; doi: 10.1038/srep40896 (2017)

Improved solar-driven photocatalytic performance of highly crystalline hydrogenated TiO₂ nanofibers with core-shell structure

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Author: Wu, Ming-Chung1,2,3; Chen, Ching-Hsiang4; Huang, Wei-Kang1;
Organizations: 1Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan
2Center for Reliability Sciences & Technologies, Chang Gung University, Taoyuan 33302, Taiwan
3Division of Neonatology, Department of Pediatrics, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan
4Sustainable Energy Development Center, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
5Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
6Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan
7Research Center for Applied Science, Academia Sinica, Taipei 11529, Taiwan
8Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, FI-90570 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.8 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe201703102080
Language: English
Published: Nature Publishing Group, 2017
Publish Date: 2017-03-10
Description:

Abstract

Hydrogenated titanium dioxide has attracted intensive research interests in pollutant removal applications due to its high photocatalytic activity. Herein, we demonstrate hydrogenated TiO₂ nanofibers (H:TiO₂ NFs) with a core-shell structure prepared by the hydrothermal synthesis and subsequent heat treatment in hydrogen flow. H:TiO₂ NFs 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 TiO₂ nanofibers 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 TiO₂ that 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:TiO₂ NFs can be helpful for future high performance photocatalysts in environmental applications.

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Series: Scientific reports
ISSN: 2045-2322
ISSN-E: 2045-2322
ISSN-L: 2045-2322
Issue: 7
Article number: 40896
DOI: 10.1038/srep40896
OADOI: https://oadoi.org/10.1038/srep40896
Type of Publication: A1 Journal article – refereed
Field of Science: 221 Nanotechnology
213 Electronic, automation and communications engineering, electronics
Subjects:
Funding: The authors appreciate Dr. Ming-Tao Lee group (BL-13A1) at National Synchrotron Radiation Research Centre and Prof. Hsiu-Po Kuo at Chang Gung University for useful discussion and Miss Y.-M. Chang at Instrumentation Centre of National Tsing Hua University for the TEM microstructure analysis. The authors also acknowledge the financial support of the Ministry of Science and Technology, Taiwan (MOST 105-2221-E-182-011, MOST 105-2632-E-182-001, and MOST 105-3113-E-002-010) and the financial support of Chang Gung Memorial Hospital, Linkou, Taiwan (CMRPD2F0161 and BMRPC74).
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