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Title: Formation and performances of porous InVO{sub 4} films

Abstract

Porous complex oxide films consisting of preferentially orientated orthorhombic phase of InVO{sub 4} have been prepared using a novel simple method by pyrolysis of amorphous complex precursor. The formation and controlling of porous InVO{sub 4} films can be easily obtained by modifying the calcination temperature. The pure orthorhombic InVO{sub 4} phase can be obtained at a relatively lower temperature (500 deg. C), and the films are preferential orientation of the (200) face parallel to the substrate. The phase separation mechanism was suggested for the formation of porous films. Under visible light irradiation ({lambda}>400 nm), porous InVO{sub 4} films have shown the photocatalytic activity for photodegradation of gaseous formaldehyde, and can generate photocurrent. The electrochemical properties of the films with different crystal structure and pore structure were also investigated.

Authors:
 [1];  [2];  [2];  [3]
  1. Department of Chemistry, Tsinghua University, Beijing, 100084 (China) and Department of Environmental Science and Technology, Fudan University, Shanghai 200433 (China). E-mail: zhangsc@fudan.edu.cn
  2. Department of Chemistry, Tsinghua University, Beijing, 100084 (China)
  3. Department of Chemistry, Tsinghua University, Beijing, 100084 (China). E-mail: zhuyf@mail.tsinghua.edu.cn
Publication Date:
OSTI Identifier:
20784932
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 179; Journal Issue: 3; Other Information: DOI: 10.1016/j.jssc.2005.12.021; PII: S0022-4596(05)00602-X; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CALCINATION; DIP COATING; FILMS; INDIUM COMPOUNDS; IRRADIATION; ORTHORHOMBIC LATTICES; OXIDES; PORE STRUCTURE; POROUS MATERIALS; TEMPERATURE RANGE 0400-1000 K; VANADATES

Citation Formats

Zhang Shicheng, Zhang Chuan, Yang Haipeng, and Zhu Yongfa. Formation and performances of porous InVO{sub 4} films. United States: N. p., 2006. Web. doi:10.1016/j.jssc.2005.12.021.
Zhang Shicheng, Zhang Chuan, Yang Haipeng, & Zhu Yongfa. Formation and performances of porous InVO{sub 4} films. United States. doi:10.1016/j.jssc.2005.12.021.
Zhang Shicheng, Zhang Chuan, Yang Haipeng, and Zhu Yongfa. Wed . "Formation and performances of porous InVO{sub 4} films". United States. doi:10.1016/j.jssc.2005.12.021.
@article{osti_20784932,
title = {Formation and performances of porous InVO{sub 4} films},
author = {Zhang Shicheng and Zhang Chuan and Yang Haipeng and Zhu Yongfa},
abstractNote = {Porous complex oxide films consisting of preferentially orientated orthorhombic phase of InVO{sub 4} have been prepared using a novel simple method by pyrolysis of amorphous complex precursor. The formation and controlling of porous InVO{sub 4} films can be easily obtained by modifying the calcination temperature. The pure orthorhombic InVO{sub 4} phase can be obtained at a relatively lower temperature (500 deg. C), and the films are preferential orientation of the (200) face parallel to the substrate. The phase separation mechanism was suggested for the formation of porous films. Under visible light irradiation ({lambda}>400 nm), porous InVO{sub 4} films have shown the photocatalytic activity for photodegradation of gaseous formaldehyde, and can generate photocurrent. The electrochemical properties of the films with different crystal structure and pore structure were also investigated.},
doi = {10.1016/j.jssc.2005.12.021},
journal = {Journal of Solid State Chemistry},
number = 3,
volume = 179,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}
  • The aim of our work was to investigate the processes of disordering in InVo/sub 4/ and to study its thermal stability in relation to the temperature and partial pressure of oxygen PO/sub 2/. The temperature dependence of the electrical conductivity at PO/sub 2/ = 21 kPa is shown. The activation energy of the total ionic (%) and electron (sigma) conductivities in the interval 920-1170/sup 0/K is (87 +/- 2) kJ. The isothermal dependence of the total electrical conductivity on PO/sub 2/ is also shown.
  • Nanosized InVO{sub 4} with orthorhombic structure was successfully synthesized at a relatively low calcination temperature of 600 deg. C by using an amorphous heteronuclear complex as precursor. The photocatalytic activity of InVO{sub 4} catalyst has been evaluated by the decomposition of formaldehyde (FAD) under UV light ({lambda}=254nm) and visible light irradiation ({lambda}>420nm). The as-synthesized InVO{sub 4} catalyst showed higher photocatalytic activity for the FAD decomposition compared to the sample prepared by the conventional solid-state reaction. The calculations of the electronic band structures indicated that the valence band was composed of the O 2p orbitals, whereas the conduction band was formedmore » by the V 3d orbitals with a small contribution of the In 5s orbitals. The photocatalytic activity of the as-prepared sample is discussed on the basis of the electronic band structure and bulk material structure.« less
  • Novel chrysanthemum-like hierarchical microstructures of orthorhombic InVO{sub 4} were synthesized via a hydrothermal route without assistance of any template or organic additive. The chrysanthemum-like InVO{sub 4} microstructures are built up of numerous nanobelts radially aligned around the spherical surface. Based on the structural feature of orthorhombic InVO{sub 4} and the key role of the pH value, a probable mechanism of the etching-splitting growth process induced by H{sup +} ions was proposed to explain the formation of InVO{sub 4} microstructures. Furthermore, the chrysanthemum-like InVO{sub 4} sample shows a high discharge capacity of 608.6 mAh g{sup -1} and acceptable capacity retention whenmore » used as an electrode material in lithium ion batteries. The pure orthorhombic phase and unique porous morphology play basic roles in the structural requirement to serve as transport paths for lithium ion.« less
  • Graphical abstract: A facile method for preparation of reduced graphene oxide (RGO) sheets supported indium vanadate (InVO{sub 4}) photocatalysts is reported. The visible light response and adsorption ability of RGO-InVO{sub 4} nanocomposites is greatly improved, which can effectively remove methyl orange and Cr (VI) from water. - Highlights: • Supramolecular photocatalyst of RGO-InVO{sub 4} was achieved. • Reduction of GO and preparation of RGO-InVO{sub 4} was simultaneous. • The prepared RGO-InVO{sub 4} shows high photocatalytic activity and adsorption capacity under visible light. • In situ growth of uniform InVO{sub 4} particles on RGO sheets is facile and efficient - Abstract:more » In this study, we report a facile method for preparation of reduced graphene oxide (RGO) sheets supported indium vanadate (InVO{sub 4}) photocatalysts. A wide range of characterization techniques, such as Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction, Thermogravimetric analysis and Transmission electron microscopy were applied to characterize the obtained composites. The results indicated that the composites consist of uniformly dispersed InVO{sub 4} nanocrystals on RGO sheets. Visible light responses of RGO-InVO{sub 4} nanocomposites are greatly improved as compared with the bulk InVO{sub 4}. The as-prepared RGO-InVO{sub 4} nanocomposites can effectively remove methyl orange and Cr (VI) from water under visible light irradiation, which can be used as novel photocatalysts for environmental protection.« less
  • The (NH{sub 4})[Fe(AsO{sub 4}){sub 1-x}(PO{sub 4}){sub x}F] (x=0.3, 0.6, 0.8) series of compounds has been synthesized under mild hydrothermal conditions. The compounds crystallize in the orthorhombic Pna2{sub 1} space group, with the unit-cell parameters a=13.1718(1), b=6.5966(6), c=10.797(1) A for x=0.3; a=13.081(1), b=6.5341(6), c=10.713(1) A for x=0.6 and a=13.0329(9), b=6.4994(4), c=10.6702(6) A for x=0.8, with the volumes 938.6(1), 915.7(1) and 903.8(1) A{sup 3}, respectively, with Z=8. Single crystals of (NH{sub 4})[Fe(AsO{sub 4}){sub 0.7}(PO{sub 4}){sub 0.3}F] heated under air atmosphere at 465 deg. C remain as single crystals, changing the composition to Fe(AsO{sub 4}){sub 0.7}(PO{sub 4}){sub 0.3}. This later phase belongs tomore » the orthorhombic Imam space group, with the unit cell parameters a=13.328(2), b=6.5114(5), c=10.703(1) A, V=928.9(2) A{sup 3} and Z=12. The crystal structure of the ammonium phases consists of a KTP three-dimensional framework constructed by chains formed by alternating Fe(2)O{sub 4}F{sub 2} or Fe(1)O{sub 4}F{sub 2} octahedra and As/P(2)O{sub 4} or As/P(1)O{sub 4} tetrahedra, respectively. These octahedra and tetrahedra are linked by a common oxygen vertex. The chains run along the 'a' and 'b' crystallographic axes. The crystal structure of Fe(AsO{sub 4}){sub 0.7}(PO{sub 4}){sub 0.3} is a three-dimensional skeleton derived from that of the precursor, formed from (100) sheets stacked along the [001] direction, and interconnected by chains of alternating Fe(2)O{sub 6} octahedra and As/P(2)O{sub 4} tetrahedra sharing a vertex in the 'a' direction. Transmission electronic microscopy of this compound indicates the existence of unconnected external cavities with a BET surface area of 3.91(3) m{sup 2} g{sup -1}. The diffuse reflectance spectra in the visible region show the forbidden electronic transitions characteristic of the Fe(III) d{sup 5}-high spin cation in slightly distorted octahedral geometry, for all the compounds. The ESR spectra for all the compounds, carried out from room temperature to 4.2 K, remain isotropic with variation in temperature; the g-value is 1.99(1). Magnetic measurements indicate the predominance of antiferromagnetic interactions, with Neel temperatures near to 70.0 and 50.0 K for the ammonium phases and Fe(AsO{sub 4}){sub 0.7}(PO{sub 4}){sub 0.30}, respectively. At low temperatures a spin canting phenomenon for Fe(AsO{sub 4}){sub 0.7}(PO{sub 4}){sub 0.30} is detected. - Graphical abstract: The relationship between the |100| and |010| chains in (NH{sub 4})[Fe(AsO{sub 4}){sub 1-x}(PO{sub 4}){sub x}F] left and the |100| chains and the (001) sheets in Fe(AsO{sub 4}){sub 0.7}(PO{sub 4}){sub 0.3}.« less