화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.98, 130-139, June, 2021
DOI10.1016/j.jiec.2021.03.021  Export Citation
Low-temperature strategy for vapor phase hydrothermal synthesis of C/N/S-doped TiO2 nanorod arrays with enhanced photoelectrochemical and photocatalytic activity
Hai Yu, Miao Zhang, Yanfen Wang1, Janguo Lv2, Yanmei Liu, Gang He, and Zhaoqi Sun†
  • School of Physics and Materials Science, Anhui University, Hefei 230601, PR China
  • 1School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, PR China
  • 2School of Physics and Engineering, Hefei Normal University, Hefei 230601, PR China
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In this study, a material with high photocatalytic activity was synthesized using ternary C/N/S-doped TiO2 nanorod array (TiO2); this was done using a practical and straightforward vapor-phase hydrothermal (VPH) method at a low temperature. The effect of C/N/S content on TiO2 morphology, optical, photocatalytic and photoelectrochemical (PCE) properties of the material was investigated by varying the quality of thiourea. C/N/S-TiO2 reduced the bonding rate of electron-hole pairs and enhances visible light absorption, photocatalytic, and PCE properties. The C/N/S doping could significantly adjust the absorption cut-off wavelengths (407-602 nm) and shorten the bandgap (3.04-2.18 eV) of TiO2. Under simulated sunlight, 8-C/N/S-TiO2 had the highest photocatalytic efficiency of 97.6% for methylene blue (MB) in 150 min with a rate constant of 0.0192 min-1, which is approximately four times that of TiO2 (0.005 min-1). The 8-C/N/S-TiO2 photoelectrode had the lowest transfer resistance for interfacial charges and highest transient photocurrent of 33.5 μA/cm2, which is five times higher than that of TiO2 (6.6 mA/ cm2). The 8-C/N/S-TiO2 exhibits the most extensive PCE behavior as a photoelectrode, and has a current density of 38.2 mA/cm2 at 2.5VRHE, which is about two times higher than TiO2 (19.1 mA/cm2). The favorable sunlight-driven photocatalytic activity is probably due to the synergistic effect of C/N/S-doping, which shifts the valence band maximum of TiO2 upward. This provides new ideas for future solar cells that can use dye-sensitized TiO2 nanorod arrays as photoanodes. It is noteworthy that VPH is a very effective strategy for fabricating semiconductors doped with multiple nonmetallic elements.
Keywords:Vapor phase hydrothermal method;Low-temperature strategy;One-step synthesis non-metal doping;C/N/S-TiO2;Photoelectrochemical activity
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