نتایج جستجو برای: co doped

تعداد نتایج: 376975  

2015
P. Velicsanyi M. Gerstl A. Nenning H. Hutter J. Fleig

Model-type thin films of Gd doped and Gd/Mn co-doped ceria were investigated by means of impedance spectroscopy in a humid H2 atmosphere. A novel measurement technique for microelectrodes with interdigitating Pt current collectors was employed. This method allows a separation of the different elementary processes contributing to the electrode impedance. After annealing at 650°C in humid H2 atmo...

Co2+ & Er3+ co-doped ZnO nanocrystals were synthesized by the hydrothermal method at 180°C and pH= 12 for 48 h. Powder XRD patterns indicate that the Zn1-2xErxCoxO crystals (0.00<x≤0.035) are isostructural with ZnO. The cell parameters increase for Er3+ and Co2+ upon increasing the dopant content (x). SEM images show that doping of Er3+ and Co2+ into the sites of Zn2+ does not change the morpho...

Journal: :Physical chemistry chemical physics : PCCP 2014
G Seeta Rama Raju E Pavitra Jae Su Yu

Trivalent lanthanide (Eu(3+), Tb(3+) and Dy(3+)) ions activated tunable color emitting BaGd2O4 (BG) phosphors were synthesized by a facile Pechini-type sol-gel process. The X-ray diffraction pattern confirmed the orthorhombic phase after annealing at 1300 °C for 5 h. Morphological studies were performed based on the analysis of transmission electron microscopy images, which showed needle type n...

2014
Daniel F. Abbott Sanjeev Mukerjee Valery Petrykin Zdeněk Bastl Niels Bendtsen Halck Jan Rossmeisl Petr Krtil

Daniel F. Abbott, Sanjeev Mukerjee, Valery Petrykin, Zdeněk Bastl, Niels Bendtsen Halck, Jan Rossmeisl and Petr Krtil* Nanocrystalline ruthenium dioxide and doped ruthenia of the composition Ru1 xMxO2 (M1⁄4 Co, Ni, Zn) with 0 # x # 0.2 were prepared by the spray-freezing freeze-drying technique. The oxygen reduction activity and selectivity of the prepared materials were evaluated in alkaline m...

2013
Younes Hanifehpour Sang Woo Joo Bong-Ki Min

Lu3+/Yb3+ and Lu3+/Er3+ co-doped Sb2Se3 nanomaterials were synthesized by co-reduction method in hydrothermal condition. Powder X-ray diffraction patterns indicate that the LnxLn'xSb2-2xSe3 Ln: Lu3+/Yb3+ and Lu3+/Er3+ crystals (x = 0.00 - 0.04) are isostructural with Sb2Se3. The cell parameters were increased for compounds upon increasing the dopant content (x). Scanning electron microscopy and...

2016
Ning Wan Xia Lu Yuesheng Wang Weifeng Zhang Ying Bai Yong-Sheng Hu Sheng Dai

Tin dioxide (SnO2) is a widely investigated lithium (Li) storage material because of its easy preparation, two-step storage mechanism and high specific capacity for lithium-ion batteries (LIBs). In this contribution, a phase-pure cobalt-doped SnO2 (Co/SnO2) and a cobalt and nitrogen co-doped SnO2 (Co-N/SnO2) nanocrystals are prepared to explore their Li storage behaviors. It is found that the m...

2016
Lin Zhou Xiaoxiao Li Ze Yao Zhuwen Chen Mei Hong Rongshu Zhu Yongye Liang Jing Zhao

Catalytic oxidation of carbon monoxide (CO) is of great importance in many different fields of industry. Until now it still remains challenging to use non-noble metal based catalysts to oxidize CO at low temperature. Herein, we report a new class of nanoporous, uniform, and transition metal-doped cerium (IV) oxide (ceria, CeO2) microsphere for CO oxidation catalysis. The porous and uniform micr...

2007
Monique Calhoun Erica Hayes Ei Ei Brown Uwe Hommerich

The purpose of this research is to evaluate new materials as gain media for midinfrared (MIR) solid-state lasers. MIR lasers are of significant current interest for several applications including laser remote sensing of bio-chemical agents, medical surgery, fundamental spectroscopy, and biophotonics. In this project, Cobalt (Co) doped ZnSe windows and CdTe crystals were investigated as MIR lase...

Journal: :Physical chemistry chemical physics : PCCP 2013
Qingsen Meng Tuo Wang Enzuo Liu Xinbin Ma Qingfeng Ge Jinlong Gong

This paper describes an investigation into the general trend in electronic properties of anatase TiO2 photocatalysts co-doped with transition metals and nitrogen employing first-principles density functional theory. Fourteen different transition metals (M), including Sc, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, and Cd, have been considered. The characteristic band structures of the co-dopi...

2014
Dandan Lu Min Zhang Zhihua Zhang Qiuye Li Xiaodong Wang Jianjun Yang

Self-organized V-N co-doped TiO2 nanotube arrays (TNAs) with various doping amount were synthesized by anodizing in association with hydrothermal treatment. Impacts of V-N co-doping on the morphologies, phase structures, and photoelectrochemical properties of the TNAs films were thoroughly investigated. The co-doped TiO2 photocatalysts show remarkably enhanced photocatalytic activity for the CO...

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