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Title: Enhancing the photoresponse and photocatalytic properties of TiO 2 by controllably tuning defects across {101} facets

Abstract

Introducing defects into semiconductors with well-controlled exposed facets offers an effective route for the development of photocatalytic materials with greatly improved properties. Here, we report a facile ethylene glycol reduction procedure to make anatase titanium dioxide (TiO 2) with different concentrations of exposed {001} and {101} facets, leading to different surficial defects. TiO 2 with increased concentrations of {101} facets shows a 5-fold improvement in photocurrent generation as well as improved photocatalytic activity towards water splitting under visible light irradiation. Thus, the improved activity is ascribed to the oxygen vacancies as well as the variable surface chemical states, which collectively induce a slower recombination rate of photo-induced electron-hole pairs. This work also highlights a feasible strategy to obtain the defective TiO 2 and explore the synergistic effect of surface defects and different concentrations of exposed {001} and {101} facets for photocurrent and photocatalytic properties under visible light irradiation.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [1]
  1. Chongqing Univ. (China). College of Materials Science and Engineering and Electron Microscopy Center
  2. Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemistry and Biochemistry
  3. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
  4. Wake Forest Univ., Winston-Salem, NC (United States). Dept. of Chemistry and Center for Energy, Environment, and Sustainability (CEES)
  5. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division, Carbon and Composites
  6. Tsinghua Univ., Beijing (China). Lab. of Advanced Materials and Dept. of Materials Science and Engineering
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC) Basic Energy Sciences (BES) (SC-22). Materials Science and Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; National Natural Science Foundation of China (NNSFC); China Scholarship Council; Wake Forest Univ., Winston-Salem, NC (United States); National Science Foundation (NSF)
OSTI Identifier:
1427641
DOE Contract Number:  
AC05-00OR22725; 51302329; 201606055013; MRI 1040264; DGE-1650044; AC02-05CH11231; ACI-1053575; DMR160118
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Surface Science; Journal Volume: 434; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Wan, Piaopiao, Hood, Zachary D., Oak Ridge National Lab., Adhikari, Shiba P., Oak Ridge National Lab., Xu, Yunfan, Yang, Shize, and Wu, Sujuan. Enhancing the photoresponse and photocatalytic properties of TiO2 by controllably tuning defects across {101} facets. United States: N. p., 2018. Web. doi:10.1016/j.apsusc.2017.11.003.
Wan, Piaopiao, Hood, Zachary D., Oak Ridge National Lab., Adhikari, Shiba P., Oak Ridge National Lab., Xu, Yunfan, Yang, Shize, & Wu, Sujuan. Enhancing the photoresponse and photocatalytic properties of TiO2 by controllably tuning defects across {101} facets. United States. doi:10.1016/j.apsusc.2017.11.003.
Wan, Piaopiao, Hood, Zachary D., Oak Ridge National Lab., Adhikari, Shiba P., Oak Ridge National Lab., Xu, Yunfan, Yang, Shize, and Wu, Sujuan. Thu . "Enhancing the photoresponse and photocatalytic properties of TiO2 by controllably tuning defects across {101} facets". United States. doi:10.1016/j.apsusc.2017.11.003.
@article{osti_1427641,
title = {Enhancing the photoresponse and photocatalytic properties of TiO2 by controllably tuning defects across {101} facets},
author = {Wan, Piaopiao and Hood, Zachary D. and Oak Ridge National Lab. and Adhikari, Shiba P. and Oak Ridge National Lab. and Xu, Yunfan and Yang, Shize and Wu, Sujuan},
abstractNote = {Introducing defects into semiconductors with well-controlled exposed facets offers an effective route for the development of photocatalytic materials with greatly improved properties. Here, we report a facile ethylene glycol reduction procedure to make anatase titanium dioxide (TiO2) with different concentrations of exposed {001} and {101} facets, leading to different surficial defects. TiO2 with increased concentrations of {101} facets shows a 5-fold improvement in photocurrent generation as well as improved photocatalytic activity towards water splitting under visible light irradiation. Thus, the improved activity is ascribed to the oxygen vacancies as well as the variable surface chemical states, which collectively induce a slower recombination rate of photo-induced electron-hole pairs. This work also highlights a feasible strategy to obtain the defective TiO2 and explore the synergistic effect of surface defects and different concentrations of exposed {001} and {101} facets for photocurrent and photocatalytic properties under visible light irradiation.},
doi = {10.1016/j.apsusc.2017.11.003},
journal = {Applied Surface Science},
number = C,
volume = 434,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2018},
month = {Thu Mar 15 00:00:00 EDT 2018}
}