Preparation of a high active photocatalyst, K2La2Ti3O10, by polymerized complex method and its photocatalytic activity of water splitting

1998 ◽  
Vol 13 (4) ◽  
pp. 852-855 ◽  
Author(s):  
Shigeru Ikeda ◽  
Michikazu Hara ◽  
Junko N. Kondo ◽  
Kazunari Domen ◽  
Hiroyuki Takahashi ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Solid State ◽  
Single Phase ◽  
Layered Perovskite ◽  
Complex Method ◽  
Conventional Solid State Reaction ◽  
Perovskite Type Oxide ◽  
Gel Technique ◽  
Perovskite Type ◽  
Pc Method

A layered perovskite type oxide, K2La2Ti3O10, was prepared by a gel technique using the polymerized complex (PC) method. A single phase K2La2Ti3O10 was obtained by adding twice the potassium required for stoichiometry. The Ni–K2La2Ti3O10 catalyst prepared by the PC method exhibited a higher photocatalytic activity for decomposition of H2O into H2 and O2 than that prepared by a conventional solid state reaction.

Preparation of LiFePO4 as a Cathode Material for Lithium Ion Batteries by a Citric Acid Complex Method

2006 ◽  
Vol 320 ◽  
pp. 259-262
Author(s):  
Masashi Higuchi ◽  
Kaori Uchida ◽  
Keiichi Katayama ◽  
Yasuo Azuma
Keyword(s):  
Particle Size ◽  
Citric Acid ◽  
Solid State ◽  
Single Phase ◽  
Lithium Ion ◽  
Solid State Reaction Method ◽  
Complex Method ◽  
Conventional Solid State Reaction ◽  
Acid Complex ◽  
Reaction Method

LiFePO4 powders were prepared by a citric acid complex method. The effects of source composition and firing conditions on the formation of LiFePO4 were investigated. Single phase and well-crystallized LiFePO4 powders were obtained at 500°C for 5h. The particle size of the obtained powder is smaller than that of powder prepared by the conventional solid-state reaction method.

Preparation and Properties of Low-Temperature Sintered SrBi4Ti4O15/Ag Composites

2007 ◽  
Vol 280-283 ◽  
pp. 145-150 ◽  
Author(s):  
Ping Huang ◽  
Ting Xian Xu ◽  
Feng Hou ◽  
Qiang Zou
Keyword(s):  
Dielectric Constant ◽  
Single Phase ◽  
Sintering Temperature ◽  
Secondary Phase ◽  
Solid State Reaction Method ◽  
Dielectric Measurement ◽  
Layered Perovskite ◽  
Conventional Solid State Reaction ◽  
Ag Particles ◽  
The Matrix

Strontium bismuth titanate (SBTi) matrix composites containing Ag particles were synthesized by the conventional solid-state reaction method. The SBTi/Ag composites have been characterized by various techniques: x-ray diffraction, optical metallurgical microscope, scanning electron microscope and dielectric measurement. It is found that Ag doping significantly affect the physical properties of composites. By adding Ag particles to the SBTi matrix, the single-phase layered perovskite structure of the matrix is preserved and the sintering temperature of the system decrease from 1120°C of the single-phase SBTi to 950°C of the SBTi/Ag composites. With the increase of sintering temperature, the size of silver particles increase, but the SBTi grains have no significant growth. The SBTi/Ag composites show a significant change of the dielectric constant. By increasing Ag content, a gradual increase of the dielectric constant is observed and the dielectric loss of the SBTi/Ag composites remain unchanged when the temperature rangers from room temperature to 200°C, however, the Curie peak of dielectric constant is repressed, which has been interpreted based on the effective dielectric fields developed around conducting phases and the inhibition effect of nonferroelectric secondary phase to electro-strain.

The Microwave Electromagnetic Properties of Sr2+ Doped DyFeO3

2011 ◽  
Vol 197-198 ◽  
pp. 405-408
Author(s):  
Shao Teng Yan ◽  
Xiao Gu Huang ◽  
Feng Dai ◽  
Peng De Han ◽  
Li Xi Wang ◽  
...  
Keyword(s):  
Single Phase ◽  
Intermediate Phase ◽  
Electromagnetic Properties ◽  
Network Analyzer ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Xrd Patterns ◽  
Perovskite Type ◽  
Peak Value

Perovskite type ferrite doped with Sr2+, Dy1-xMxFeO3(x = 0.0, 0.05, 0.15, 0.25) were prepared by the conventional solid-state reaction. The structure and electromagnetic properties of the calcined samples were studied using powder X-ray diffraction (XRD, Rigaku D/Max-2500) and network analyzer (Agilent 8722ET). All the XRD patterns showed the single phase of the perovskite type ferrite without other intermediate phase when x≤0.25. The electromagnetic properties of the samples have been studied at the frequency range from 2 GHz to 18 GHz. The ε′ and ε′′ values were improved significantly. Both the values of ε′ and ε′′ increase with the increasing content of the doped cations Sr2+, and the peak value of ε′′ was about 2.2 at 12.1 GHz position when x = 0.25.

Preparation and characterization of visible light sensitive Fe- and Ta-codoped TiO2 photocatalyst

2010 ◽  
Vol 25 (1) ◽  
pp. 110-116 ◽  
Author(s):  
Tetsuya Kako ◽  
Weifeng Yao ◽  
Jinhua Ye
Keyword(s):  
Photocatalytic Activity ◽  
Solid State ◽  
Visible Light ◽  
Complex Method ◽  
Polymer Complex ◽  
Optical Absorption Spectra ◽  
Tio2 Photocatalyst ◽  
Yellow Color ◽  
Organic Decomposition

Titania (TiO2) was modified by codoping of Fe3+ and Ta5+ to absorb visible light. The codoped titania [(Fe,Ta)xTi1–xO2, 0 ≤ x ≤ 1] were prepared by a solid state reaction or by the polymer complex method. With increased codoping, the optical absorption spectra are red-shifted and the color ranges from white to brown via yellow. Also, the codoped titania (0 < x ≤ 0.05) possesses photocatalytic activity for organic decomposition under visible light irradiation. The codoped titania (x = 0.01) with yellow color shows the highest activity among the codoped titania (0 ≤ x ≤ 1) and a higher activity than the 1% Fe3+-doped TiO2 with orange brown color.

Crystal Structure Analysis of Barium Titanate – Bismuth Perovskite-Type Oxide System Ceramics and their Piezoelectric Property

2009 ◽  
Vol 421-422 ◽  
pp. 38-41 ◽  
Author(s):  
Keisuke Yamato ◽  
Nobuhiro Kumada ◽  
Chikako Moriyoshi ◽  
Yoshihiro Kuroiwa ◽  
Bong Yeon Lee ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Single Phase ◽  
Raw Materials ◽  
Crystal Structure Analysis ◽  
Oxide System ◽  
Electric Field Dependence ◽  
Perovskite Type Oxide ◽  
Bismuth Perovskite ◽  
Perovskite Type ◽  
Curie Temperature Tc

Barium titanate (BaTiO3, BT) – bismuth lanthanum zinc titanium oxide [(BiyLa1-y)(Zn0.5Ti0.5)O3, ByL1-yZT] solid solution ceramics were prepared to enhance Curie temperature (TC) of BT, 132 °C, to 200 °C. As the raw materials, nanoparticles were used to make sintering temperatures lower. Optimization of calcination and sintering conditions resulted in a formation of a perovskite single-phase, and their densities were always greater than 94 %. The synchrotron XRD measurement revealed that the crystal structures were assigned to rhombohedral 3m. Temperature dependence of dielectric property revealed that for the 0.5BT-0.5BZT ceramics, TC was 230 °C. Moreover, La-doping into BT-BZT ceramics resulted in decrease of TC significantly. Finally, their piezoelectric properties were measured by electric-field dependence of strain at room temperature, and for the 0.6BT-0.4BZT ceramics, the apparent d33 was measured at 250 pC/N.

Oxygen Reduction Activity on a Nanosized Perovskite-Type Oxide Prepared by Polyvinyl Pyrrolidone Method

2015 ◽  
Vol 12 (2) ◽  
Author(s):  
Tsukasa Nagai ◽  
Naoko Fujiwara ◽  
Mitsunori Kitta ◽  
Masafumi Asahi ◽  
Shin-ichi Yamazaki ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Carbon Black ◽  
Oxygen Reduction ◽  
Transmission Electron Microscope ◽  
Polyvinyl Pyrrolidone ◽  
Disk Electrode ◽  
Conventional Solid State Reaction ◽  
Perovskite Type Oxide ◽  
Transmission Electron ◽  
Perovskite Type

A nanosized perovskite-type oxide supported on carbon black (perovskite/C) was prepared by the polyvinyl pyrrolidone (PVP) addition method and subsequent mechanical milling with carbon black. Transmission electron microscope (TEM) observation and scanning transmission electron microscope (STEM)–energy dispersive X-ray (EDX) mapping clearly revealed that the oxide prepared by the PVP method was small (ca. 20 nm) and highly dispersed on the carbon support. The oxygen reduction reaction (ORR) activity on the perovskite/C catalyst was investigated with rotating ring-disk electrode (RRDE) measurement in an alkaline solution at 25 °C. The prepared perovskite/C catalyst showed enhanced activity compared to catalysts obtained by the conventional solid state reaction and citrate process; i.e., a positive shift of the onset potential and increased ORR current at a disk electrode. The present catalyst was also associated with decreased ring current.

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