Method for preparing rodlike cobaltosic oxide nano structure
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A cobalt tetroxide rod and nanostructure technology, which is applied in chemical instruments and methods, cobalt oxide/cobalt hydroxide, nanotechnology and other directions, can solve the problems of water pollution by chemical methods, cumbersome preparation process, etc., and achieves simple equipment, great application prospects, The effect of improving the performance of lithium-ion batteries
Inactive Publication Date: 2011-08-17
PEKING UNIV
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Its main disadvantage is that the obtained samples are mostly nanoparticles, and although nanowires can be obtained by using porous alumina templates, most of them are polycrystalline structures.
And the preparation process of this method is more loaded down with trivial details, and the chemical method used easily causes water pollution
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[0016] The experimental methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials can be obtained from commercial sources unless otherwise specified.
[0017] The invention adopts the direct oxidation method to realize the preparation of high-density cobalt tetroxide nano-rod-like structure in a pure argon atmosphere containing water vapor. See the schematic diagram of the device figure 1 , and its preparation process is as follows:
[0018] (a) Before all experiments, the device for heating water was turned on. When heating the sample, the water temperature is at the set temperature.
[0019] (b) The industrial cobalt sheet with a purity of 99.8% is divided into small pieces of about 1 cm×1 cm, and then the sample is pressed flat by a tablet press under the pressure of 10 Mpa.
[0020] (c) Sand the sample sequentially with 300, 400, 500, 800, 1000 and 2000# sandpaper to remove the surface oxide layer and mak...
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Abstract
The invention provides a method for preparing a rodlike cobaltosic oxide nano structure with high density, belonging to the field of nano material development. The method comprises the following step of placing a cobalt sheet in a heating container for thermal treatment in an argon atmosphere to obtain the rodlike cobaltosic oxide nano structure, wherein the argon atmosphere is formed by introducing pure argon with the purity of 99.9% into a reaction container in the rate of 20 ml / min, the reaction container is not vacuumized in advance, the atmosphere simultaneously requires heating water to supplement water vapor entering an air path, and the temperature of heating water is 30-90 DEG C. The length of the densely distributed rodlike cobaltosic oxide nano structure obtained by the invention is about 1 mum, and the diameter is about 100 nm. The rodlike cobaltosic oxide nano structure is mostly in the shape of a bamboo leaf, the shape has the advantage of great specific surface area, so that more gases can be absorbed in a catalytic application, and the catalytic performance is improved.
Description
technical field [0001] The invention belongs to the field of research and development of nanomaterials, in particular to a preparation method of a large-area high-density rod-shaped nanostructure of cobalt tetroxide. Background technique [0002] Cobalt tetroxide nanomaterials have important applications in lithium-ion batteries and carbon monoxide catalysis. Some nanomaterials with different morphologies, such as nanoparticles, nanowires, films, etc., have been prepared. The preparation of these nanomaterials is generally based on a solution method, that is, first cobalt oxalate, cobalt carbonate and other precursors are prepared by solute precipitation methods (such as sol-gel method, hydrothermal method, etc.), and then these samples are heated to prepare Nanomaterials such as cobalt tetroxide nanoparticles (X.Wang, X.-L.Wu, Y.-G.Guo, Y.Zhong, X.Cao, Y.Ma, J.Yao, Adv.Func.Mater.20, 1680 , 2010; X. Wang, X. Chen, L. Gao, H. Zheng, Z. Zhang, Y. Qian, J. Phys. Chem. B 108,...
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