Enhanced piezotronics by single-crystalline ferroelectrics for uniformly strengthening the piezo-photocatalysis of electrospun BaTiO3@TiO2 nanofibers

Fu, Bi1,2,3; Li, Jianjie1; Jiang, Huaide1; He, Xiaoli1; Ma, Yanmei1; Wang, Jingke1; Shi, Chaoyang4; Hu, Chengzhi1,3

2022-08-01

10.1039/d2nr03828e

Nanoscale   影响因子和分区

2040-3364

2040-3372

Turning the built-in electric field by modulating the morphology and microstructure of ferroelectric materials is considered a viable approach to enhancing the piezo-photocatalytic activity of the ferroelectric/oxide semiconductor heterojunctions. Here, hydrothermally synthesized single-crystalline BaTiO3 nanoparticles are employed to construct BaTiO3@TiO2 hybrid nanofibers by sol-gel assisted electrospinning of TiO2 nanofibers and annealing. Because of the obvious enhancement of the synergetic piezo-photocatalytic effect under both ultrasonic and ultraviolet (UV) light irradiation, the piezo-photocatalytic degradation rate constant (k) of BaTiO3@TiO2 hybrid nanofibers on methyl orange (MO) reaches 14.84 x 10(-2) min(-1), which is approximately seven fold that for piezocatalysis and six fold that for photocatalysis. Moreover, BaTiO3@TiO2 core-shell nanoparticles are also synthesized for comparison purposes to assess the influence of microstructure on the piezo-photocatalysis by a wet-chemical coating of TiO2 on BaTiO3 nanoparticles. Such a high piezo-photocatalytic activity is attributed to the enhancement of the piezotronic effect by the single-crystalline ferroelectric nanoparticles and the nanoconfinement effect caused by the one-dimensional boundary of nanofibers with high specific surface areas. The mechanically induced uniform local built-in electric fields originated from the single-crystalline ferroelectric nanoparticles can enhance the separation of photogenerated electron and hole pairs and promote the formation of free hydroxyl radicals, resulting in a strong piezotronic effect boosted photochemical degradation of organic dye. This work introduces the single-crystalline ferroelectrics to construct ferroelectric/oxide semiconductor heterojunctions, and the enhanced local piezotronic effect uniformly strengthens the photochemical reactivity, which offers a new option to design high-efficiency piezo-photocatalysts for pollutant treatment.

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China["61903177","11802318"] ; Start-Up Funding of Guangdong Polytechnic Normal University[2022SDKYA010 (99166990215)] ; Shenzhen Science and Technology Program[JCYJ20190809144013494] ; Science and Technology Program of Guangdong[2021A1515011813] ; Science, Technology and Innovation Commission of Shenzhen Municipality[ZDSYS20200811143601004]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000843395700001

ROYAL SOC CHEMISTRY

20223712704748

Azo dyes ; Barium titanate ; Degradation ; Electric fields ; Electrospinning ; Ferroelectric materials ; Ferroelectricity ; Heterojunctions ; Microstructure ; Morphology ; Nanofibers ; Photocatalytic activity ; Rate constants ; Sol-gels ; Synthesis (chemical) ; TiO2 nanoparticles

Electricity: Basic Concepts and Phenomena:701.1 ; Dielectric Materials:708.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Organic Compounds:804.1 ; Inorganic Compounds:804.2 ; Ceramics:812.1 ; Fiber Chemistry and Processing:819.3 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Solid State Physics:933 ; Materials Science:951

Web of Science

1.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen Key Lab Biomimet Robot & Intelligent Sys, Shenzhen 518055, Peoples R China
2.Guangdong Polytech Normal Univ, Sch Optoelect Engn, Guangzhou 510665, Peoples R China
3.Southern Univ Sci & Technol, Guangdong Prov Key Lab Human Augmentat & Rehabil, Shenzhen 518055, Peoples R China
4.Tianjin Univ, Sch Mech Engn, Key Lab Mech Theory & Equipment Design, Minist Educ, Tianjin 300072, Peoples R China

Fu, Bi,Li, Jianjie,Jiang, Huaide,et al. Enhanced piezotronics by single-crystalline ferroelectrics for uniformly strengthening the piezo-photocatalysis of electrospun BaTiO3@TiO2 nanofibers[J]. Nanoscale,2022.

Fu, Bi.,Li, Jianjie.,Jiang, Huaide.,He, Xiaoli.,Ma, Yanmei.,...&Hu, Chengzhi.(2022).Enhanced piezotronics by single-crystalline ferroelectrics for uniformly strengthening the piezo-photocatalysis of electrospun BaTiO3@TiO2 nanofibers.Nanoscale.

Fu, Bi,et al."Enhanced piezotronics by single-crystalline ferroelectrics for uniformly strengthening the piezo-photocatalysis of electrospun BaTiO3@TiO2 nanofibers".Nanoscale (2022).