Impact of oxygen vacancy occupancy on piezo-catalytic activity of BaTiO3 nanobelt

被引：322
作者：
Wang, Penglei [1 ]
Li, Xinyong [1 ]
Fan, Shiying [1 ]
Chen, Xin [1 ]
Qin, Meichun [1 ]
Long, Dan [1 ]
Tad, Moses O. [2 ]
Liu, Shaomin [2 ,3 ]
机构：
[1] Dalian Univ Technol, Sch Environm Sci & Technol, State Key Lab Fine Chem, Key Lab Ind Ecol & Environm Engn MOE, Dalian 116024, Peoples R China
[2] Curtin Univ, Dept Chem Engn, GPO Box U1987, Perth, WA 6845, Australia
[3] Beijing Univ Chem Technol, Coll Chem Engn, Beijing 100029, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2020年 / 279卷
基金：
中国国家自然科学基金;
关键词：
Piezo-catalysis; Oxygen Vacancy Occupancy; Piezoelectric response; Mechanism; ENHANCED PHOTOCATALYSIS; SELECTIVE OXIDATION; REDOX REACTIONS; H-2; EVOLUTION; DEGRADATION; ENERGY; WATER; SURFACE; NANOSTRUCTURES; DECOMPOSITION;
D O I：
10.1016/j.apcatb.2020.119340
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
BaTiO3 nanobelt featuring controlled oxygen vacancies, namely BTO-OV-X (X represents time (h) of vacuum heat-treatment), were prepared to systematically investigate the effect of oxygen vacancies occupancy on pizeocatalytic performance for degradation of organic pollutant. Remarkably, the creation of oxygen vacancies on BaTiO3 can mediate the piezocatalytic activity. The piezocatalytic activity exhibited a volcano-type trend with increasing oxygen vacancies. Results from first-principles density functional theoretical (DFT) calculations and O-2-temperature programmed desorption (O-2-TPD) measurement indicated that the presence of oxygen vacancies could efficiently adsorb and activate O-2 on the surface of BaTiO3 nanobelt and consequently enhance piezocatalytic activity. Importantly, with the aid of piezoresponse force microscopy (PFM) measurement, the intrinsic reason of volcano-type trend of oxygen vacancy-activity was well unveiled. This work reveals the effect and mechanism of oxygen vacancy occupancy on enhancing piezocatalytic activity of BaTiO3 nanobelt and will shed light on design of efficient piezocatalysts in the future.
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页数：9
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