Oxygen vacancy induces self-doping effect and metalloid LSPR in non-stoichiometric tungsten suboxide synergistically contributing to the enhanced photoelectrocatalytic performance of WO3-:X/TiO2-x heterojunction

Weicheng Huang; Jinxin Wang; Lang Bian; Chaoyue Zhao; Danqing Liu; Chongshen Guo; Bin Yang; Wenwu Cao

doi:10.1039/c8cp02044b

Oxygen vacancy induces self-doping effect and metalloid LSPR in non-stoichiometric tungsten suboxide synergistically contributing to the enhanced photoelectrocatalytic performance of WO_3-:X/TiO_2-x heterojunction

Weicheng Huang, Jinxin Wang, Lang Bian, Chaoyue Zhao, Danqing Liu, Chongshen Guo, Bin Yang, Wenwu Cao

Research output: Contribution to journal › Article › peer-review

43 Scopus citations

Abstract

A WO_3-x/TiO_2-x nanotube array (NTA) heterojunction photoanode was strategically designed to improve photoelectrocatalytic (PEC) performance by establishing a synergistic vacancy-induced self-doping effect and localized surface plasmon resonance (LSPR) effect of metalloid non-stoichiometric tungsten suboxide. The WO_3-x/TiO_2-x NTA heterojunction photoanode was synthesized through a successive process of anodic oxidation to form TiO₂ nanotube arrays, magnetron sputtering to deposit metalloid WO_3-x, and post-hydrogen reduction to engender oxygen vacancy in TiO_2-x as well as crystallization. On the merits of such a synergistic effect, WO_3-x/TiO_2-x shows higher light-harvesting ability, stronger photocurrent response, and resultant improved photoelectrocatalytic performance than the contrast of WO_3-x/TiO₂, WO₃/TiO₂ and TiO₂, confirming the importance of oxygen vacancies in improving PEC performance. Theoretical calculation based on density functional theory was applied to investigate the electronic structural features of samples and reveal how the oxygen vacancy determines the optical property. The carrier density tuning mechanism and charge transfer model were considered to be associated with the synergistic effect of self-doping and metalloid LSPR effect in the WO_3-x/TiO_2-x NTA.

Original language	English (US)
Pages (from-to)	17268-17278
Number of pages	11
Journal	Physical Chemistry Chemical Physics
Volume	20
Issue number	25
DOIs	https://doi.org/10.1039/c8cp02044b
State	Published - 2018

All Science Journal Classification (ASJC) codes

General Physics and Astronomy
Physical and Theoretical Chemistry

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Huang, W., Wang, J., Bian, L., Zhao, C., Liu, D., Guo, C., Yang, B., & Cao, W. (2018). Oxygen vacancy induces self-doping effect and metalloid LSPR in non-stoichiometric tungsten suboxide synergistically contributing to the enhanced photoelectrocatalytic performance of WO_3-:X/TiO_2-x heterojunction. Physical Chemistry Chemical Physics, 20(25), 17268-17278. https://doi.org/10.1039/c8cp02044b

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title = "Oxygen vacancy induces self-doping effect and metalloid LSPR in non-stoichiometric tungsten suboxide synergistically contributing to the enhanced photoelectrocatalytic performance of WO3-:X/TiO2-x heterojunction",

abstract = "A WO3-x/TiO2-x nanotube array (NTA) heterojunction photoanode was strategically designed to improve photoelectrocatalytic (PEC) performance by establishing a synergistic vacancy-induced self-doping effect and localized surface plasmon resonance (LSPR) effect of metalloid non-stoichiometric tungsten suboxide. The WO3-x/TiO2-x NTA heterojunction photoanode was synthesized through a successive process of anodic oxidation to form TiO2 nanotube arrays, magnetron sputtering to deposit metalloid WO3-x, and post-hydrogen reduction to engender oxygen vacancy in TiO2-x as well as crystallization. On the merits of such a synergistic effect, WO3-x/TiO2-x shows higher light-harvesting ability, stronger photocurrent response, and resultant improved photoelectrocatalytic performance than the contrast of WO3-x/TiO2, WO3/TiO2 and TiO2, confirming the importance of oxygen vacancies in improving PEC performance. Theoretical calculation based on density functional theory was applied to investigate the electronic structural features of samples and reveal how the oxygen vacancy determines the optical property. The carrier density tuning mechanism and charge transfer model were considered to be associated with the synergistic effect of self-doping and metalloid LSPR effect in the WO3-x/TiO2-x NTA.",

author = "Weicheng Huang and Jinxin Wang and Lang Bian and Chaoyue Zhao and Danqing Liu and Chongshen Guo and Bin Yang and Wenwu Cao",

note = "Funding Information: This work was financially supported by the National Natural Science Foundation of China (No. 51572056, 51572059 & 51602083), Heilongjiang Provincial Natural Science Foundation for Distinguished Young Scholars (Grant No. JC2017001), and the Harbin Applied Technology Research and Development Project (2017RAXXJ003). Publisher Copyright: {\textcopyright} 2018 the Owner Societies.",

year = "2018",

doi = "10.1039/c8cp02044b",

language = "English (US)",

volume = "20",

pages = "17268--17278",

journal = "Physical Chemistry Chemical Physics",

issn = "1463-9076",

publisher = "Royal Society of Chemistry",

number = "25",

}

Huang, W, Wang, J, Bian, L, Zhao, C, Liu, D, Guo, C, Yang, B & Cao, W 2018, 'Oxygen vacancy induces self-doping effect and metalloid LSPR in non-stoichiometric tungsten suboxide synergistically contributing to the enhanced photoelectrocatalytic performance of WO_3-:X/TiO_2-x heterojunction', Physical Chemistry Chemical Physics, vol. 20, no. 25, pp. 17268-17278. https://doi.org/10.1039/c8cp02044b

Oxygen vacancy induces self-doping effect and metalloid LSPR in non-stoichiometric tungsten suboxide synergistically contributing to the enhanced photoelectrocatalytic performance of WO_3-:X/TiO_2-x heterojunction. / Huang, Weicheng; Wang, Jinxin; Bian, Lang et al.
In: Physical Chemistry Chemical Physics, Vol. 20, No. 25, 2018, p. 17268-17278.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Oxygen vacancy induces self-doping effect and metalloid LSPR in non-stoichiometric tungsten suboxide synergistically contributing to the enhanced photoelectrocatalytic performance of WO3-:X/TiO2-x heterojunction

AU - Huang, Weicheng

AU - Wang, Jinxin

AU - Bian, Lang

AU - Zhao, Chaoyue

AU - Liu, Danqing

AU - Guo, Chongshen

AU - Yang, Bin

AU - Cao, Wenwu

N1 - Funding Information: This work was financially supported by the National Natural Science Foundation of China (No. 51572056, 51572059 & 51602083), Heilongjiang Provincial Natural Science Foundation for Distinguished Young Scholars (Grant No. JC2017001), and the Harbin Applied Technology Research and Development Project (2017RAXXJ003). Publisher Copyright: © 2018 the Owner Societies.

PY - 2018

Y1 - 2018

N2 - A WO3-x/TiO2-x nanotube array (NTA) heterojunction photoanode was strategically designed to improve photoelectrocatalytic (PEC) performance by establishing a synergistic vacancy-induced self-doping effect and localized surface plasmon resonance (LSPR) effect of metalloid non-stoichiometric tungsten suboxide. The WO3-x/TiO2-x NTA heterojunction photoanode was synthesized through a successive process of anodic oxidation to form TiO2 nanotube arrays, magnetron sputtering to deposit metalloid WO3-x, and post-hydrogen reduction to engender oxygen vacancy in TiO2-x as well as crystallization. On the merits of such a synergistic effect, WO3-x/TiO2-x shows higher light-harvesting ability, stronger photocurrent response, and resultant improved photoelectrocatalytic performance than the contrast of WO3-x/TiO2, WO3/TiO2 and TiO2, confirming the importance of oxygen vacancies in improving PEC performance. Theoretical calculation based on density functional theory was applied to investigate the electronic structural features of samples and reveal how the oxygen vacancy determines the optical property. The carrier density tuning mechanism and charge transfer model were considered to be associated with the synergistic effect of self-doping and metalloid LSPR effect in the WO3-x/TiO2-x NTA.

AB - A WO3-x/TiO2-x nanotube array (NTA) heterojunction photoanode was strategically designed to improve photoelectrocatalytic (PEC) performance by establishing a synergistic vacancy-induced self-doping effect and localized surface plasmon resonance (LSPR) effect of metalloid non-stoichiometric tungsten suboxide. The WO3-x/TiO2-x NTA heterojunction photoanode was synthesized through a successive process of anodic oxidation to form TiO2 nanotube arrays, magnetron sputtering to deposit metalloid WO3-x, and post-hydrogen reduction to engender oxygen vacancy in TiO2-x as well as crystallization. On the merits of such a synergistic effect, WO3-x/TiO2-x shows higher light-harvesting ability, stronger photocurrent response, and resultant improved photoelectrocatalytic performance than the contrast of WO3-x/TiO2, WO3/TiO2 and TiO2, confirming the importance of oxygen vacancies in improving PEC performance. Theoretical calculation based on density functional theory was applied to investigate the electronic structural features of samples and reveal how the oxygen vacancy determines the optical property. The carrier density tuning mechanism and charge transfer model were considered to be associated with the synergistic effect of self-doping and metalloid LSPR effect in the WO3-x/TiO2-x NTA.

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