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This content will become publicly available on March 7, 2018

Title: Synergetic effect of Ti 3+ and oxygen doping on enhancing photoelectrochemical and photocatalytic properties of TiO 2/g-C 3N 4 heterojunctions

To improve the utilization of visible light and reduce photogenerated electron/hole recombination, Ti 3+ self-doped TiO 2/oxygen-doped graphitic carbon nitride (Ti 3+-TiO 2/O-g-C 3N 4) heterojunctions were prepared via hydrothermal treatment of a mixture of g-C 3N 4 and titanium oxohydride sol obtained from the reaction of TiH 2 with H 2O 2. In this way, exfoliated O-g-C 3N 4 and Ti 3+-TiO 2 nanoparticles were obtained. Simultaneously, strong bonding was formed between Ti 3+-TiO 2 nanoparticles and exfoliated O-g-C 3N 4 during the hydrothermal process. Charge transfer and recombination processes were characterized by transient photocurrent responses, electrochemical impedance test, and photoluminescence spectroscopy. The photocatalytic performances were investigated through rhodamine B degradation test under an irradiation source based on 30 W cold visible-light-emitting diode. The highest visible-light photoelectrochemical and photocatalytic activities were observed from the heterojunction with 1:2 mass ratio of Ti 3+-TiO 2 to O-g-C 3N 4. The photodegradation reaction rate constant based on this heterojuction is 0.0356 min -1, which is 3.87 and 4.56 times higher than those of pristine Ti 3+-TiO 2 and pure g-C 3N 4, respectively. Here, the remarkably high photoelectrochemical and photocatalytic performances of the heterojunctions are mainly attributed to the synergetic effect ofmore » efficient photogenerated electron-hole separation, decreased electron transfer resistance from interfacial chemical hydroxy residue bonds, and oxidizing groups originating from Ti 3+-TiO 2 and O-g-C 3N 4.« less
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [1] ; ORCiD logo [2]
  1. Ludong Univ., Yantai (People's Republic of China)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Shandong Univ., Jinan (People's Republic of China)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 9; Journal Issue: 13; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; Ti3+ self-doped TiO2; oxygen doped g-C3N4; heterojunctions; PEC; photocatalysis; cold LED light
OSTI Identifier:
1371557