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Enhanced Charge Separation of TiO2 Nanotubes Photoelectrode for Efficient Conversion of CO2

  • Jing Wu
    Jing Wu
    State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin 150090, China
    More by Jing Wu
  • Da Li
    Da Li
    State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin 150090, China
    More by Da Li
  • Jia Liu*
    Jia Liu
    State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin 150090, China
    *E-mail: [email protected]
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  • Chao Li
    Chao Li
    State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin 150090, China
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  • Zeng Li
    Zeng Li
    State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin 150090, China
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  • Bruce E. Logan
    Bruce E. Logan
    Department of Civil and Environmental Engineering, Penn State University, 212 Sackett Building, University Park, Pennsylvania 16802, United States
  • , and 
  • Yujie Feng*
    Yujie Feng
    State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin 150090, China
    *E-mail: [email protected]. Phone: (+86) 451-86287017. Fax: (+86) 451-86287017.
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Cite this: ACS Sustainable Chem. Eng. 2018, 6, 10, 12953–12960
Publication Date (Web):September 7, 2018
https://doi.org/10.1021/acssuschemeng.8b02375
Copyright © 2018 American Chemical Society
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Abstract

For the production of TiO2 nanotubes (TNTs) efficient photoelectrodes they must have efficient charge separation by trapping holes and transfer of electrons. In this study, MnOx and Pd codecorated TNTs photoelectrodes were successfully constructed using a simple impregnation method, followed by an electrochemical deposition process. The photocatalytic activities for CO2 conversion by the optimized TNTs photoelectrode (10Pd/0.8Mn/TNTs) were increased by 2.8 times to produce 40.3 ± 2.5 mg L–1 acetic acid, and by 2.5 times to generate 24.6 ± 1.9 mg L–1 formic acid compared to a bare TNTs photoelectrode. The optimized photoelectrode also showed the highest transient photocurrent of 1.15 mA cm–2. The improved performance was due to the elevated charge separation through bidirectional modulation of photogenerated holes and electrons, on the basis of the steady-state surface photovoltage and analysis with the formed •OH concentrations, electrochemical reduction tests with N2 or CO2 atmospheres, and electrochemical impedance spectra. The decorated MnOx effectively trapped the photogenerated holes, and the decorated Pd facilitated photogenerated electron transfer and promoted visible light absorption. The decorated MnOx and Pd also played catalytic roles in the redox reactions involved with the photogenerated charge carriers.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acssuschemeng.8b02375.

  • Additional details and figures including XRD patterns, UV–vis absorption reflectance spectra, Tauc plots, EDX results, TEM image, HRTEM image, Nyquist plots, fluorescence spectra, and SPS responses (PDF)

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Cited By


This article is cited by 5 publications.

  1. Jing Wu, Yujie Feng, B.E. Logan, Changchao Dai, Xiaoyu Han, Da Li, Jia Liu. Preparation of Al–O-Linked Porous-g-C3N4/TiO2-Nanotube Z-Scheme Composites for Efficient Photocatalytic CO2 Conversion and 2,4-Dichlorophenol Decomposition and Mechanism. ACS Sustainable Chemistry & Engineering 2019, 7 (18) , 15289-15296. https://doi.org/10.1021/acssuschemeng.9b02489
  2. Jing Wu, Xiaoyu Han, Da Li, Bruce E. Logan, Jia Liu, Zhaohan Zhang, Yujie Feng. Efficient CO2 conversion to formic acid in a novel microbial photoelectrochemical cell using a visible-light responsive Co3O4 nanorod-arrayed photocathode. Applied Catalysis B: Environmental 2020, 276 , 119102. https://doi.org/10.1016/j.apcatb.2020.119102
  3. Fei Li, Bo Dong, Shenglei Feng. Bi shell-BiOI core microspheres modified TiO2 nanotube arrays photoanode: Improved effect of Bi shell on photoelectrochemical hydrogen evolution in seawater. International Journal of Hydrogen Energy 2019, 44 (57) , 29986-29999. https://doi.org/10.1016/j.ijhydene.2019.09.210
  4. Jingui Zheng, Fengyun Hu, Ershuan Han, Zhengbin Pan, Shuai Zhang, Ya Li, Peiguang Qin, Hui Wang, Peiqiang Li, Hongzong Yin. Interaction between InP and SnO2 on TiO2 nanotubes for photoelectrocatalytic reduction of CO2. Colloids and Surfaces A: Physicochemical and Engineering Aspects 2019, 575 , 329-335. https://doi.org/10.1016/j.colsurfa.2019.05.016
  5. Jing Wu, Yujie Feng, Da Li, Xiaoyu Han, Jia Liu. Efficient photocatalytic CO2 reduction by P–O linked g-C3N4/TiO2-nanotubes Z-scheme composites. Energy 2019, 178 , 168-175. https://doi.org/10.1016/j.energy.2019.04.168