A Ti-OH bond breaking route for creating oxygen vacancy in titania towards efficient CO2 photoreduction

Meng Shen; Min Wang; Qiang Wang; Jianjian Tian; Lingxia Zhang; Lianzhou Wang; Jianlin Shi

doi:10.1016/j.cej.2021.131513

A Ti-OH bond breaking route for creating oxygen vacancy in titania towards efficient CO₂ photoreduction

Meng Shen, Min Wang, Qiang Wang, Jianjian Tian, Lingxia Zhang, Lianzhou Wang, Jianlin Shi

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

46 Scopus citations

Abstract

Due to the strong bonding between Ti and O atoms, creating oxygen vacancy in stable TiO₂ usually involves harsh synthetic conditions. In this work, inspired by DFT calculation results that much lower energy is required to dissociate Ti-OH bond than Ti-O bond, we report a facile approach by simply calcining TiO_x(OH)_y precursor in inertia atmosphere, to effectively create oxygen vacancy in titania (Ti-N₂-600). During CO₂ photoreduction, CH₄ and CO are the major products on Ti-N₂-600, whose evolution rates are about 2.8 times and 3.6 times those on commercial TiO₂ (P25), respectively. The in-situ Fourier-transform infrared spectroscopy (FTIR) results indicate the oxygen vacancy in Ti-N₂-600 favors 1) CO₂ activation and photoreduction since CO₂·^- is generated but not detected on P25; 2) the *CO_L formation and further transformation. This Ti-OH breakage strategy presents a new insight into oxygen vacancy generation in TiO₂ and more generically other metal oxide semiconductors.

Original language	English
Article number	131513
Journal	Chemical Engineering Journal
Volume	425
DOIs	https://doi.org/10.1016/j.cej.2021.131513
State	Published - 1 Dec 2021
Externally published	Yes

Keywords

CO reduction
Hydroxyl
Oxygen vacancy
Photocatalysis
TiO

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10.1016/j.cej.2021.131513

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title = "A Ti-OH bond breaking route for creating oxygen vacancy in titania towards efficient CO2 photoreduction",

abstract = "Due to the strong bonding between Ti and O atoms, creating oxygen vacancy in stable TiO2 usually involves harsh synthetic conditions. In this work, inspired by DFT calculation results that much lower energy is required to dissociate Ti-OH bond than Ti-O bond, we report a facile approach by simply calcining TiOx(OH)y precursor in inertia atmosphere, to effectively create oxygen vacancy in titania (Ti-N2-600). During CO2 photoreduction, CH4 and CO are the major products on Ti-N2-600, whose evolution rates are about 2.8 times and 3.6 times those on commercial TiO2 (P25), respectively. The in-situ Fourier-transform infrared spectroscopy (FTIR) results indicate the oxygen vacancy in Ti-N2-600 favors 1) CO2 activation and photoreduction since CO2·- is generated but not detected on P25; 2) the *COL formation and further transformation. This Ti-OH breakage strategy presents a new insight into oxygen vacancy generation in TiO2 and more generically other metal oxide semiconductors.",

keywords = "CO reduction, Hydroxyl, Oxygen vacancy, Photocatalysis, TiO",

author = "Meng Shen and Min Wang and Qiang Wang and Jianjian Tian and Lingxia Zhang and Lianzhou Wang and Jianlin Shi",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2021",

month = dec,

day = "1",

doi = "10.1016/j.cej.2021.131513",

language = "英语",

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journal = "Chemical Engineering Journal",

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TY - JOUR

T1 - A Ti-OH bond breaking route for creating oxygen vacancy in titania towards efficient CO2 photoreduction

AU - Shen, Meng

AU - Wang, Min

AU - Wang, Qiang

AU - Tian, Jianjian

AU - Zhang, Lingxia

AU - Wang, Lianzhou

AU - Shi, Jianlin

PY - 2021/12/1

Y1 - 2021/12/1

N2 - Due to the strong bonding between Ti and O atoms, creating oxygen vacancy in stable TiO2 usually involves harsh synthetic conditions. In this work, inspired by DFT calculation results that much lower energy is required to dissociate Ti-OH bond than Ti-O bond, we report a facile approach by simply calcining TiOx(OH)y precursor in inertia atmosphere, to effectively create oxygen vacancy in titania (Ti-N2-600). During CO2 photoreduction, CH4 and CO are the major products on Ti-N2-600, whose evolution rates are about 2.8 times and 3.6 times those on commercial TiO2 (P25), respectively. The in-situ Fourier-transform infrared spectroscopy (FTIR) results indicate the oxygen vacancy in Ti-N2-600 favors 1) CO2 activation and photoreduction since CO2·- is generated but not detected on P25; 2) the *COL formation and further transformation. This Ti-OH breakage strategy presents a new insight into oxygen vacancy generation in TiO2 and more generically other metal oxide semiconductors.

AB - Due to the strong bonding between Ti and O atoms, creating oxygen vacancy in stable TiO2 usually involves harsh synthetic conditions. In this work, inspired by DFT calculation results that much lower energy is required to dissociate Ti-OH bond than Ti-O bond, we report a facile approach by simply calcining TiOx(OH)y precursor in inertia atmosphere, to effectively create oxygen vacancy in titania (Ti-N2-600). During CO2 photoreduction, CH4 and CO are the major products on Ti-N2-600, whose evolution rates are about 2.8 times and 3.6 times those on commercial TiO2 (P25), respectively. The in-situ Fourier-transform infrared spectroscopy (FTIR) results indicate the oxygen vacancy in Ti-N2-600 favors 1) CO2 activation and photoreduction since CO2·- is generated but not detected on P25; 2) the *COL formation and further transformation. This Ti-OH breakage strategy presents a new insight into oxygen vacancy generation in TiO2 and more generically other metal oxide semiconductors.

KW - CO reduction

KW - Hydroxyl

KW - Oxygen vacancy

KW - Photocatalysis

KW - TiO

UR - https://www.scopus.com/pages/publications/85112486415

U2 - 10.1016/j.cej.2021.131513

DO - 10.1016/j.cej.2021.131513

M3 - 文章

AN - SCOPUS:85112486415

SN - 1385-8947

VL - 425

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

M1 - 131513

ER -

A Ti-OH bond breaking route for creating oxygen vacancy in titania towards efficient CO₂ photoreduction

Abstract

Keywords

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