Enhanced ferroelectric-nanocrystal-based hybrid photocatalysis by ultrasonic-wave-generated piezophototronic effect.

An electric field built inside a crystal was proposed to enhance photoinduced carrier separation for improving photocatalytic property of semiconductor photocatalysts. However, a static built-in electric field can easily be saturated by the free carriers due to electrostatic screening, and the enhancement of photocatalysis, thus, is halted. To overcome this problem, here, we propose sonophotocatalysis based on a new hybrid photocatalyst, which combines ferroelectric nanocrystals (BaTiO3) and semiconductor nanoparticles (Ag2O) to form an Ag2O-BaTiO3 hybrid photocatalyst. Under periodic ultrasonic excitation, a spontaneous polarization potential of BaTiO3 nanocrystals in responding to ultrasonic wave can act as alternating built-in electric field to separate photoinduced carriers incessantly, which can significantly enhance the photocatalytic activity and cyclic performance of the Ag2O-BaTiO3 hybrid structure. The piezoelectric effect combined with photoelectric conversion realizes an ultrasonic-wave-driven piezophototronic process in the hybrid photocatalyst, which is the fundamental of sonophotocatalysis.

[1]  Zhong Lin Wang,et al.  Theoretical Study of Piezo‐phototronic Nano‐LEDs , 2014, Advanced materials.

[2]  Hong Liu,et al.  Recent progress in design, synthesis, and applications of one-dimensional TiO2 nanostructured surface heterostructures: a review. , 2014, Chemical Society reviews.

[3]  Zhong Lin Wang,et al.  Piezotronics and piezo-phototronics—fundamentals and applications , 2014 .

[4]  Jun Chen,et al.  Triboelectrification-based organic film nanogenerator for acoustic energy harvesting and self-powered active acoustic sensing. , 2014, ACS nano.

[5]  Dong Hee Shin,et al.  High photoresponsivity in an all-graphene p–n vertical junction photodetector , 2014, Nature Communications.

[6]  Håkan Pettersson,et al.  Strong Schottky barrier reduction at Au-catalyst/GaAs-nanowire interfaces by electric dipole formation and Fermi-level unpinning , 2014, Nature Communications.

[7]  T. Tachikawa,et al.  A nanocomposite superstructure of metal oxides with effective charge transfer interfaces , 2014, Nature Communications.

[8]  G. Rohrer,et al.  Photocatalysts with internal electric fields. , 2014, Nanoscale.

[9]  F. Acar,et al.  Sonocatalytic degradation of Direct Blue 71 azo dye at the presence Zero-Valent Iron (ZVI) , 2013 .

[10]  Zhong Lin Wang,et al.  Piezotronics and piezo-phototronics – From single nanodevices to array of devices and then to integrated functional system , 2013 .

[11]  S. Dunn,et al.  Effect of Ferroelectricity on Solar-Light-Driven Photocatalytic Activity of BaTiO3—Influence on the Carrier Separation and Stern Layer Formation , 2013 .

[12]  Wei Zhang,et al.  Built-in electric field-assisted surface-amorphized nanocrystals for high-rate lithium-ion battery. , 2013, Nano letters.

[13]  Di Wu,et al.  Ferroelectric-field-effect-enhanced electroresistance in metal/ferroelectric/semiconductor tunnel junctions. , 2013, Nature materials.

[14]  Can Li,et al.  Roles of cocatalysts in photocatalysis and photoelectrocatalysis. , 2013, Accounts of chemical research.

[15]  Justin D. Holmes,et al.  Ferroelectric nanoparticles, wires and tubes: synthesis, characterisation and applications , 2013 .

[16]  Chao‐Nan Xu,et al.  Ultrasonic wave induced mechanoluminescence and its application for photocatalysis as ubiquitous light source , 2013 .

[17]  Can Li,et al.  Spatial separation of photogenerated electrons and holes among {010} and {110} crystal facets of BiVO4 , 2013, Nature Communications.

[18]  M. Reed,et al.  Record high efficiency single-walled carbon nanotube/silicon p-n junction solar cells. , 2013, Nano letters.

[19]  Can Li,et al.  Photocatalytic overall water splitting promoted by an α-β phase junction on Ga2O3. , 2012, Angewandte Chemie.

[20]  D. Krishnaiah,et al.  Application of a semiconductor oxide-based catalyst in heterogeneous wastewater treatment: A green technology approach , 2012 .

[21]  Ning Liu,et al.  A review of photocatalysis using self-organized TiO2 nanotubes and other ordered oxide nanostructures. , 2012, Small.

[22]  D. Pile.  Polariton spin transport , 2012, Nature Photonics.

[23]  Zhong‐Lin Wang,et al.  Progress in Piezotronics and Piezo‐Phototronics , 2012, Advanced materials.

[24]  N. Ming,et al.  Colossal electroresistance in metal/ferroelectric/semiconductor tunnel diodes for resistive switching memories , 2012, 1208.5300.

[25]  U. Banin,et al.  Ultrafast photoinduced charge separation in metal-semiconductor nanohybrids. , 2012, ACS nano.

[26]  Huifang Xu,et al.  Piezoelectrochemical Effect: A New Mechanism for Azo Dye Decolorization in Aqueous Solution through Vibrating Piezoelectric Microfibers , 2012 .

[27]  X. Duan,et al.  Towards highly efficient photocatalysts using semiconductor nanoarchitectures , 2012 .

[28]  G. Rohrer,et al.  Heterostructured Ceramic Powders for Photocatalytic Hydrogen Production: Nanostructured TiO2 Shells Surrounding Microcrystalline (Ba,Sr)TiO3 Cores , 2012 .

[29]  N. Tessler,et al.  Molecular control of quantum-dot internal electric field and its application to CdSe-based solar cells. , 2011, Nature materials.

[30]  Zhenqiang Ma,et al.  Interface engineering by piezoelectric potential in ZnO-based photoelectrochemical anode. , 2011, Nano letters.

[31]  Weidong Ruan,et al.  Metal–Semiconductor Contacts Induce the Charge-Transfer Mechanism of Surface-Enhanced Raman Scattering , 2011 .

[32]  G. L. Puma,et al.  Operating parameters and synergistic effects of combining ultrasound and ultraviolet irradiation in the degradation of 2,4,6-trichlorophenol , 2011 .

[33]  Jun Wang,et al.  Sonocatalytic performance of Er3+:YAlO3/TiO2–Fe2O3 in organic dye degradation , 2011 .

[34]  Yang Yang,et al.  Efficiency enhancement in organic solar cells with ferroelectric polymers. , 2011, Nature materials.

[35]  Y. Yue,et al.  Nano-p–n junctions on surface-coarsened TiO2 nanobelts with enhanced photocatalytic activity , 2011 .

[36]  Jian Pan,et al.  On the true photoreactivity order of {001}, {010}, and {101} facets of anatase TiO2 crystals. , 2011, Angewandte Chemie.

[37]  Xiaobo Chen,et al.  Increasing Solar Absorption for Photocatalysis with Black Hydrogenated Titanium Dioxide Nanocrystals , 2011, Science.

[38]  Jun Gao,et al.  Direct imaging and probing of the p-n junction in a planar polymer light-emitting electrochemical cell. , 2011, Journal of the American Chemical Society.

[39]  Zhong Lin Wang.  Piezopotential gated nanowire devices: Piezotronics and piezo-phototronics , 2010 .

[40]  Geon-Tae Hwang,et al.  Piezoelectric BaTiO₃ thin film nanogenerator on plastic substrates. , 2010, Nano letters.

[41]  A. Rinzler,et al.  Electronic junction control in a nanotube-semiconductor Schottky junction solar cell. , 2010, Nano letters.

[42]  Ji-yang Wang,et al.  Ag2O/TiO2 nanobelts heterostructure with enhanced ultraviolet and visible photocatalytic activity. , 2010, ACS applied materials & interfaces.

[43]  T. Vo‐Dinh,et al.  Photoelectrocatalysis: principles, nanoemitter applications and routes to bio-inspired systems , 2010 .

[44]  H. Hwang,et al.  Built-in and induced polarization across LaAlO3/SrTiO3 heterojunctions , 2010, 1005.4257.

[45]  Huifang Xu,et al.  Direct Water Splitting Through Vibrating Piezoelectric Microfibers in Water , 2010 .

[46]  Youfan Hu,et al.  Designing the electric transport characteristics of ZnO micro/nanowire devices by coupling piezoelectric and photoexcitation effects. , 2010, ACS nano.

[47]  D. Krishnaiah,et al.  Sonophotocatalysis in advanced oxidation process: a short review. , 2009, Ultrasonics sonochemistry.

[48]  S. Dunn,et al.  Photochemistry on a polarisable semi-conductor: what do we understand today? , 2009, Journal of Materials Science.

[49]  G. Madras,et al.  Kinetics of sonophotocatalytic degradation of anionic dyes with Nano-TiO2. , 2009, Environmental science & technology.

[50]  S. Martinez,et al.  Study of the sonophotocatalytic degradation of basic blue 9 industrial textile dye over slurry titanium dioxide and influencing factors. , 2008, Ultrasonics sonochemistry.

[51]  Chuncheng Chen,et al.  Enhanced sonocatalytic degradation of azo dyes by Au/TiO2. , 2008, Environmental science & technology.

[52]  G. Rohrer,et al.  The Influence of the Dipolar Field Effect on the Photochemical Reactivity of Sr2Nb2O7 and BaTiO3 Microcrystals , 2008 .

[53]  M. Steigerwald,et al.  Crystal structure and the paraelectric-to-ferroelectric phase transition of nanoscale BaTiO3. , 2008, Journal of the American Chemical Society.

[54]  S. Kaur,et al.  Visible light induced sonophotocatalytic degradation of Reactive Red dye 198 using dye sensitized TiO2. , 2007, Ultrasonics sonochemistry.

[55]  I. Poulios,et al.  Sonolytic, photocatalytic and sonophotocatalytic degradation of malachite green in aqueous solutions , 2007 .

[56]  E. Psillakis,et al.  Photocatalytic degradation of reactive black 5 in aqueous solutions: Effect of operating conditions and coupling with ultrasound irradiation. , 2007, Water research.

[57]  Zhong Lin Wang,et al.  Direct-Current Nanogenerator Driven by Ultrasonic Waves , 2007, Science.

[58]  C. Ogino,et al.  Sonocatalytic degradation of methylene blue with TiO2 pellets in water. , 2007, Ultrasonics sonochemistry.

[59]  Zhong Lin Wang,et al.  Piezoelectric Nanogenerators Based on Zinc Oxide Nanowire Arrays , 2006, Science.

[60]  Xiangdong Zhang,et al.  Sonocatalytic degradation of methyl orange in the presence of TiO2 catalysts and catalytic activity comparison of rutile and anatase. , 2005, Ultrasonics sonochemistry.

[61]  G. Rohrer,et al.  Structure Se nsitivity of Photochemical Oxidation and Reduction Reactions on SrTiO3 Surfaces , 2003 .

[62]  E. Selli.  Synergistic effects of sonolysis combined with photocatalysis in the degradation of an azo dye , 2002 .

[63]  N. Ince,et al.  Ultrasound as a catalyzer of aqueous reaction systems: the state of the art and environmental applications , 2001 .

[64]  S. Wada,et al.  Crystal structure of barium titanate fine particles including Mg and analysis of their lattice vibration , 2000 .

[65]  K. Suslick,et al.  The Temperature of Cavitation , 1991, Science.

[66]  Johnson,et al.  Electronic structure of Ag2O. , 1990, Physical review. B, Condensed matter.

[67]  Don Berlincourt,et al.  Elastic and Piezoelectric Coefficients of Single-Crystal Barium Titanate , 1958 .

[68]  C. Oxbrow.  Ferroelectric Properties of Single Crystals , 1954, Nature.

[69]  Jun Wang,et al.  Improvement of sonocatalytic activity of TiO2 by using Yb, N and F-doped Er3+:Y3Al5O12 for degradation of organic dyes. , 2014, Ultrasonics sonochemistry.

[70]  T. K. Chaki,et al.  Facile preparation of uniform barium titanate (BaTiO3) multipods with high permittivity: impedance and temperature dependent dielectric behavior , 2014 .

[71]  Jian Wang,et al.  Effective sonocatalytic degradation of organic dyes by using Er3+:YAlO3/TiO2–SnO2 under ultrasonic irradiation , 2013 .

[72]  A. Mahvi.  Application of Ultrasonic Technology for Water and Wastewater Treatment , 2009 .