Ferroelectric BaTiO3@ZnO heterostructure nanofibers with enhanced pyroelectrically-driven-catalysis. Issue 1 (January 2019)

• Record Type: Journal Article
• Authors: Wang, Lang; Haugen, Neale O.; Wu, Zheng; Shu, Xiaoxin; Jia, Yanmin; Ma, Jiangping; Yu, Shigang; Li, Huamei; Chai, Qunxia
• Is Part Of: Ceramics international. Volume 45:Issue 1(2019)
• Page Start: 90
• Page End: 95
• Publication Date: 2019-01
• Subjects: Ferroelectric materials -- BaTiO3 nanofibers -- Pyroelectrically-driven-catalysis -- BaTiO3@ZnO heterostructures; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.09.137
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this work, an obvious enhancement of pyroelectrically-driven catalytic activity is found in BaTiO3 @ZnO heterostructures synthesized hydrothermally and then calcined. The pure BaTiO3 is able to decompose up to 45% of the RhB dye in aqueous solution (5 mg/L) under 30–54 °C cold-hot cycle. As the ZnO content coating on the surface of the BaTiO3 nanofibers is increased from 0 to 5 wt%, the decomposition ratio of the BaTiO3 @ZnO heterostructures for RhB dye in aqueous solution first increases and then decreases, giving a maximum value of 97% at 2.5 wt%. The kinetic rate constant ( K = 0.06384 cycle −1 ) of the catalytic reaction for BaTiO3 @2.5%ZnO is 4 times higher than that of pure BaTiO3 . The enhancement of catalytic activity of BaTiO3 @ZnO may be due to the formation of a semiconductor junction in which the electric field effectively separating the pyro-induced electron-hole pairs and further accelerates carrier migration. The ferroelectric heterostructures of BaTiO3 @ZnO show pyroelectrically-driven-catalysis and may hold potential for use in decomposing dye wastewater through harvesting cold-hot alternation thermal-energy.