Modulation of electric dipoles inside electrospun BaTiO3@TiO2 core-shell nanofibers for enhanced piezo-photocatalytic degradation of organic pollutants

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

2022-03-01

10.1016/j.nanoen.2021.106841

Nano Energy   影响因子和分区

2211-2855

Ferroelectric materials can generate a built-in electric field under strain, which can produce reactive oxygen species (ROS) for in-situ piezocatalysis via a series of redox reactions, or enhance photocatalytic activities through the separation of the photoinduced electron and hole pairs. In this study, the synergistic piezo-phototronic effect is enhanced by increasing the inner piezopotential of ferroelectric nanofibers in fibrous piezoelectric/oxide semiconductor heterostructures. Ferroelectric BaTiO nanofibers are fabricated by a sol-gel assisted electrospinning and subsequent annealing at 700 ºC for 2 h, 4 h, and 6 h, respectively (denoted as BT2H, BT4H, and BT6H). Piezoelectric force microscopy results reveal that the necklace-like BT6H nanofibers demonstrate the highest local piezoelectric coefficient d (42.7 pm V) than BT2H (26.3 pm V) and BT4H (37.8 pm V) nanofibers because BT6H nanofibers are composed of highly crystallized electric dipoles with single domain nanostructures. Additionally, BT6H@TiO core-shell nanofibers are synthesized by a wet-chemical coating of TiO on BT6H nanofibers. Under both ultrasound and UV light irradiations, BT6H@TiO core-shell nanofibers exhibit a high piezo-photocatalytic degradation rate constant of 6 × 10 min because of the enhancement of the piezotronic effect by the high piezoelectricity of electric dipoles that promote the separation of the photoinduced electron and hole pairs. The enhancement of the synergistic piezo-phototronic effect is ascribed to the highly active reaction sites that are confined into the high specific surface area of the one-dimensional fibrous boundary of BT6H@TiO core-shell nanofibers, beneficial for the migration of the interfacial charge carriers. This study presents a simple approach to improve the piezo-photocatalysis through modulating the crystallization and the size of electric dipoles, providing an efficient pathway for underpinning the coupling mechanism between the enhancement of local ferro/piezoelectricity and piezo-phototronic effect.

Electrospinning Ferroelectrics Piezo-photocatalysis Piezoelectric coefficient Piezoelectricity

EI

英语

第一 ; 通讯

20220111423627

Barium titanate ; Bismuth compounds ; Crystallography ; Degradation ; Electrospinning ; Ferroelectric materials ; Ferroelectricity ; Nanofibers ; Organic pollutants ; Photocatalytic activity ; Piezoelectric devices ; Rate constants ; Redox reactions ; Shells (structures) ; Sol-gels ; Titanium dioxide

Structural Members and Shapes:408.2 ; Electricity: Basic Concepts and Phenomena:701.1 ; Dielectric Materials:708.1 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Chemical Products Generally:804 ; Organic Compounds:804.1 ; Inorganic Compounds:804.2 ; Ceramics:812.1 ; Fiber Chemistry and Processing:819.3 ; Solid State Physics:933 ; Crystalline Solids:933.1

2-s2.0-85122057238

Scopus

1.Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems,Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
3.School of Optoelectronic Engineering,Guangdong Polytechnic Normal University,Guangzhou,510665,China

Fu，Bi,Li，Jianjie,Jiang，Huaide,et al. Modulation of electric dipoles inside electrospun BaTiO3@TiO2 core-shell nanofibers for enhanced piezo-photocatalytic degradation of organic pollutants[J]. Nano Energy,2022,93.

Fu，Bi.,Li，Jianjie.,Jiang，Huaide.,He，Xiaoli.,Ma，Yanmei.,...&Hu，Chengzhi.(2022).Modulation of electric dipoles inside electrospun BaTiO3@TiO2 core-shell nanofibers for enhanced piezo-photocatalytic degradation of organic pollutants.Nano Energy,93.

Fu，Bi,et al."Modulation of electric dipoles inside electrospun BaTiO3@TiO2 core-shell nanofibers for enhanced piezo-photocatalytic degradation of organic pollutants".Nano Energy 93(2022).