Nanostructured microtubes based on TiO2 doped by Zr and Hf oxides with the anatase structure

2nd International Symposium on Fundamental Aspects of Rare-earth Elements Mining and Separation and Modern Materials Engineering

材料科学;物理学

Zheleznov, V.V.^1 ; Voit, E.I.^1 ; Sushkov, Y.V.^1 ; Sarin, S.A.^1 ; Kuryavyi, V.G.^1 ; Opra, D.P.^1 ; Gnedenkov, S.V.^1 ; Sinebryukhov, S.L.^1 ; Sokolov, A.A.^2

Institute of Chemistry Russian Academy of Sciences Far Eastern-Branch, Prosp. 100-letya Vladivostoka 159, Vladivostok

690022, Russia^1

Far Eastern Federal University, Sukhanova Str. 8, Vladivostok

690950, Russia^2

关键词: Anatase structures;    Anode material;    Charge-discharge;    Core shell structure;    Hafnium titanate;    Nano-structured;    Stoichiometric ratio;    Synthesis conditions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/112/1/012016/pdf
DOI  :  10.1088/1757-899X/112/1/012016

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The nanostructured microtubes based on TiO2have been prepared on the carbon fiber template using the sol-gel method. The microtubes consist of nanoparticles of metal oxides: TiO2/ZrO2and TiO2/HfO2. The dependence of microtubes morphology and nanoparticles structure on the synthesis conditions has been studied using the methods of SEM, SAXS, and Raman spectroscopy. It has been demonstrated that at the stoichiometric ratio of up to 0.04 for Zr/Ti and up to 0.06 for Hf/Ti microtubes consist of uniform nanoparticles with the anatase structure. Along with further increase of the dopants content in the microtubes composition, nanoparticles acquire the core-shell structure. It has been suggested that nanoparticles have a core composed of the solid solutions Ti1-xZrxO2or Ti1-xHfxO2and a shell consisting of zirconium or hafnium titanate. The fabricated Zr- and Hf-doped TiO2materials were investigated in view of their possible use as anode materials for Li-ion batteries. Charge- discharge measurements showed that the doped samples manifested significantly higher reversibility in comparison with the undoped TiO2. The method opens new prospects in synthesis of nanostructured materials for Li-ion batteries application.