Search

Your search keyword '"Zhang, Xiaobo"' showing total 19 results
Start Over Author "Zhang, Xiaobo" Journal materials letters
19 results on '"Zhang, Xiaobo"'

2. Preparation and performance of Fe3O4@hydrophilic graphene composites with excellent Photo-Fenton activity for photocatalysis

Author

Liu Xuelong, Yang Liu, Lihui Zheng, Shaobo Qiu, Liqiu Wang, Zhang Xiaobo, Qi Sun, and Pengjun Wang

Subjects
Materials science, Graphene, Mechanical Engineering, Inorganic chemistry, Energy conversion efficiency, Nanoparticle, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, law.invention, Catalysis, Catalytic cycle, Mechanics of Materials, law, Photocatalysis, General Materials Science, Absorption (chemistry), Composite material, 0210 nano-technology, Photodegradation
Abstract

Composites (Fe 3 O 4 @HG) of hydrophilic graphene (HG) and Fe 3 O 4 from an iron precursor of FeC1 3 ·6H 2 O and (NH 4 ) 2 Fe(SO 4 ) 2 ·6H 2 O were prepared without any organic surfactants by a facile chemical co-precipitation method. Fe 3 O 4 nanoparticles in Fe 3 O 4 @HG were about 15 nm in dimension and were ultra-dispersed on HG nanosheets. Fe 3 O 4 @HG exhibited paramagnetic characteristic and better stability in water. Photo-Fenton reaction results demonstrated that Fe 3 O 4 @HG composites could degrade methyl-orange (MO) dye with high efficiency in a short time. When the loading capacity of HG in Fe 3 O 4 @HG composites was 53.81 wt%, the catalytic efficiency could reach 87.68% after 30 min and the catalytic rate could be 0.055 mg min −1 in the first five minutes. A possible catalytic cycle for Fe 3 O 4 @HG catalyzed photo degradation of the dye was elucidated. The photo-generated electrons were transferred rapidly on the surface of HG and promoted the conversion efficiency of Fe 3+ /Fe 2+ due to the good absorption and electronic conductivity of HG. The composites would be applied as photo-catalysts for treatment of wastewater.

Published
2016
Full Text
View/download PDF

18. The role of oxygen vacancy-Ti3+ states on TiO2 nanotubes' surface in dye-sensitized solar cells.

Author

Zhang, Xiaobo, Tian, Hanmin, Wang, Xiangyan, Xue, Guogang, Tian, Zhipeng, Zhang, Jiyuan, Yuan, Shikui, Yu, Tao, and Zou, Zhigang

Subjects
*TITANIUM oxides, *NANOTUBES, *DYE-sensitized solar cells, *ELECTRODES, *X-ray photoelectron spectroscopy, *ELECTROCHEMISTRY
Abstract

Abstract: In the present work, TiO2 nanotubes (TNTs) were inserted in working electrode of dye-sensitized solar cells (DSSCs). The surface states of TNTs and their influences on charge recombination in cell were studied. The results of the absorption spectra and X-ray photoelectron spectroscopy show that Ti3+ species exist on TNTs’ surfaces in the form of oxygen vacancy-Ti3+ states, and the analysis of the electrochemical impedance spectra of cells demonstrate that the electron recombination is aggravated in TNTs-containing cell due to the insertion of TNTs in working electrode. The possible reason was proposed. The inserted TNTs introduce oxygen vacancy-Ti3+ states in the band gap of TiO2, which can capture electrons validly and act as charge recombination centers, leading to the aggravated electron recombination in TNTs-containing cell. The results in this work demonstrate that, though Ti3+ ions absorbing the visible light is of great significance in photocatalysis, the oxygen vacancy-Ti3+ states, which exist on TNTs’ surfaces, aggravate the electron recombination in DSSCs instead. [Copyright &y& Elsevier]

Published
2013
Full Text
View/download PDF

19. Fabrication and characterization of hollow Fe3O4 nanospheres in a microemulsion

Author

Zhang, DongEn, Tong, ZhiWei, Li, ShanZhong, Zhang, XiaoBo, and Ying, Ailing

Subjects
*MAGNETITE, *X-ray diffraction, *ELECTRON diffraction, *TRANSMISSION electron microscopes
Abstract

Abstract: Hollow sphere-like Fe3O4 (magnetite) with diameters of between 200–400 nm were synthesized in a reverse microemulsions. The particles were characterized by X-ray powder diffraction (XRD), selected area electron diffraction (SAED), transmission electron microscope (TEM) and field-emission scanning electron microscopy (FESEM). The possible formation mechanism of hollow sphere-like magnetite is discussed. Also, the magnetic properties of the samples were characterized on a vibrating sample magnetometer (VSM). [Copyright &y& Elsevier]

Published
2008
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results