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Revealing the Relationship between Photocatalytic Properties and Structure Characteristics of TiO 2 Reduced by Hydrogen and Carbon Monoxide Treatment
Author(s) -
Liu Yunpeng,
Li Yuhang,
Yang Siyuan,
Lin Yuan,
Zuo Jiangliang,
Liang Hong,
Peng Feng
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201800940
Subject(s) - photocatalysis , carbon monoxide , oxygen , methyl orange , materials science , photochemistry , catalysis , reaction rate constant , hydrogen bond , chemical engineering , chemistry , molecule , kinetics , organic chemistry , engineering , physics , quantum mechanics
Reduction is considered to be an effective method to improve the photocatalytic activity of TiO 2 ; however, the underlying relationship between structure and photocatalytic performance has not been adequately unveiled to date. To obtain insights into the effect of structure on photocatalytic activity, two types of reduced TiO 2 were prepared from CO (CO‐TiO 2 ) and H 2 (H‐TiO 2 ). For H‐TiO 2 , Ti−H bonds and oxygen vacancies are formed on the surface of H‐TiO 2 , which results in a more disordered surface lattice. However, for CO‐TiO 2 , more Ti−OH bonds are formed on the surface and more bulk oxygen vacancies are introduced; the disorder layer of CO‐TiO 2 is relatively thin, owing to most surface vacancies being filled by Ti−OH bonds. Under simulated solar irradiation, the photocatalytic H 2 evolution rate of CO‐TiO 2 reaches 7.17 mmol g −1 h −1 , which is 4.14 and 1.50 times those of TiO 2 and H‐TiO 2 , respectively. The photocatalytic degradation rate constant of methyl orange on CO‐TiO 2 is 2.45 and 6.39 times those on H‐TiO 2 and TiO 2 . The superior photocatalytic activity of CO‐TiO 2 is attributed to the effective separation and transfer of photogenerated electron–hole pairs, due to the synergistic effects of oxygen vacancies and surface Ti−OH bonds. This study reveals the relationship between the photocatalytic properties and structure, and provides a new method to prepare highly active TiO 2 for H 2 production and environmental treatment.