Mesoporous Co3O4/C composite material with high specific surface and crystallization hole wall and preparation method of material

Abstract

The invention relates to a mesoporous Co3O4 / C composite material with high specific surface and crystallization hole wall and a preparation method of the material. The method comprises the following steps of: mixing and stirring an ethanol precursor solution containing a cobalt source and a carbon source with a mesoporous silica template with a three-dimensional cubic pore structure until the solvent is volatilized, and completely filling the precursor solution into the mesoporous pores of the template through a one-step nanometer filling method so as to prepare a precursor / template composite; performing heat treatment on the precursor / template composite to prepare a Co3O4 / C / template composite; and, removing the template in the Co3O4 / C / template composite through a strong acid or a strong alkali to prepare the mesoporous Co3O4 / C composite material. The method disclosed by the invention utilizes the mesoporous silica (KIT-6) with Ia3d structure as the template, fills the precursor solution containing the cobalt source and the carbon source into the mesoporous pores of the template through the one-step nanometer filling method and prepares the mesoporous Co3O4 / C composite material with high specific surface and narrow aperture distribution through certain heat treatment conditions.

Description

technical field [0001] The invention relates to a mesoporous structure Co 3 o 4 The / C composite material and its preparation method, the material prepared by the method not only has a high specific surface area, but also has good crystallization performance, and is a good fuel cell electrode catalyst material. It belongs to the field of preparation and synthesis of inorganic nanometer materials. Background technique [0002] co 3 o 4 / C, as an important class of non-precious metal composite materials, is an excellent cathode catalyst for fuel cells, by improving its specific surface area and Co 3 o 4 The degree of crystallization can greatly improve its O 2 Catalytic reduction activity, which is of great significance to reduce the cost of fuel cells. [0003] Mesoporous Co 3 o 4 The / C composite material has a high specific surface area, an ordered pore structure and an adjustable pore size, which greatly improves its catalytic activity. Especially the hard templa...

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Problems solved by technology

For example, Chinese patent CN101912784B discloses a mesoporous Co 3 o 4 / β-MnO 2 The preparation method, the method is by immersing the aqueous solution of cobalt nitrate and manganese nitrate in the n-hexane solution of the mesoporous silica template (KIT-6 template) of three-dimensional cubic pore structure, and drying, roasting, dissolving, washing and dry to prepare mesoporous Co 3 o 4 / β-MnO 2 Composite materials, the prepared composite materials have better dispersion uniformity and higher effective specific surface area, but impregnation in this method requires constant stirring, and the cost of n-hexane solvent used is relatively high and has certain harmful effects on the human body. harm

Moreover, current research on the use of KIT-6 templates to prepare mesoporous Co 3 o 4 / C composite methods are rarely reported

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