Method for preparing nano Co3O4/carbon nanotube integral air electrode catalysis material

Abstract

The invention discloses a method for preparing a nano Co3O4 / carbon nanotube integral air electrode catalysis material. The method comprises the following steps: oxidizing the surface of a carbon nanotube to achieve surface functionalization, and combining the carbon nanotube as a carrier with uniform and dense nano Co3O4 particles through chemical bonds by using a thermal treatment method, so as to form an integral air electrode catalysis material which is free of adhesive connection and stable in structure. The integral air electrode catalysis material which is prepared by using the method has high transmission velocities of molecules, ions and electrons of reactants, and has high bidirectional catalytic activity of oxygen reduction / oxygen precipitation, and excellent chemical stability and mechanical strength. The method disclosed by the inention is simple in preparation process, and the obtained integral air electrode catalysis material has great application prospects in applicationin metal-air batteries such as lithium air batteries, sodium air batteries, aluminum air batteries and zinc air batteries, fuel batteries, electrochemical reactors such as hydrogen peroxide synthesisand electrochemical oxygen production, and the like, and in commercial development.

Description

technical field [0001] The present invention relates to a kind of nano Co 3 o 4 The invention relates to a preparation method of a carbon nanotube integrated air electrode catalytic material, which belongs to the technical field of electrode materials. Background technique [0002] The rapid development of electric vehicles and mobile electronic devices urgently requires the development of batteries with higher energy density and power density. Although the current laboratory energy density of lithium-ion batteries has reached 250Wh kg -1 , but is limited by the specific capacity of the positive electrode material (the amount of electricity that can be released by a unit mass of battery or active material, mAh g -1 ) limitation, it is difficult to make a greater improvement, and the way of increasing the energy density by increasing the charging voltage will aggravate the safety problem, so it is imperative to develop a new electrochemical energy storage system. In the n...

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Problems solved by technology

According to the theoretical analysis of electrochemical reaction engineering, the electrode materials currently used have the following three problems: ①The pore structure and pore tortuousness of the cathode material used significantly affect the transmission rate of oxygen species, lithium ions and electrons in the electrode, and are prone to It is blocked by the discharge solid product, resulting in high concentration overpotential and ohmic overpotential inside the oxygen cathode; ②The conductive carrier is generally made of activated carbon material, which has insufficient stability in resisting electro-oxidation, and it is easier to electro-oxidize to CO gas under high pressure, etc. , due to the oxidation of the carrier, the catalytic active material is easy to fall off from the carrier, which increases the reaction overpotential of the battery and deteriorates the cycle stability; ③The binder has poor conductivity and insufficient stability, which makes the contact resistance between the active material and the carrier material Larger, conductive networks are prone to fragmentation

Although currently Co 3 o 4 The adsorption of particles to carbon nanotubes can provide a large number of catalytic active sites, showing a low reaction overpotential, but the binding force between them and the carbon support is a weak physical force, the binding strength is small, easy to fall off, and the catalytic stability of the electrode Not high [Wei Licheng, a preparation method and application of carbon-coated porous cobalt trioxide nanoparticles [P] No.201810617115.3]

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