A two-step method for preparing a nitrogen-doped carbon-supported cobalt tetroxide particle catalyst

Abstract

The invention relates to the field of energy materials, and discloses a two-step method for preparing a nitrogen-doped carbon-supported cobalt tetroxide particle catalyst for the problem that carbon atoms will reduce cobalt tetroxide during high-temperature pyrolysis to reduce the number of active components. It includes the following preparation steps: add cobalt source and nitrogen source to deionized water, add carbon source after being completely dissolved, and ultrasonically disperse evenly; react the above-mentioned solution at 170~190°C; suction filtration and drying in sequence; the obtained samples were ground evenly and subjected to high-temperature pyrolysis in argon to obtain finished products. The present invention uses biomass carbon source glucose and its derivatives, urea and cobalt sulfate as precursors, and prepares nitrogen-doped carbon-loaded tricobalt tetroxide through two steps of hydrothermal-pyrolysis, effectively reducing the problem of tricobalt tetroxide being reduced during the pyrolysis process, The number of active sites on the catalyst surface is guaranteed.

Description

Technical field [0001] The present invention belongs to the field of energy material, particularly relates to a two-step process method of a carbon-supported catalyst particles of tricobalt tetraoxide a nitrogen doping. Background technique [0002] With the large consumption of fossil fuels, growing environmental problems, the development of efficient, low-pollution clean energy for sustainable development is of great significance. And a metal fuel cell based electrochemical energy conversion technique - air battery because of its clean, efficient, advantages Carnot cycle reaction is not limited, researchers much attention. However, this type of battery electrode surface reacts with oxygen are slow, often require a noble metal catalyst for accelerating the reaction, resulting in increased battery costs. Accordingly, bifunctional oxygen Preparation of catalyst cost is very important. Cobalt oxide (Co 3 O 4 ) Is a transition metal oxide having a spinel structure, where cobalt ions...

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Problems solved by technology

[0006] The present invention aims to overcome the problem that carbon atoms will reduce cobalt tetroxide during the pyrolysis process in the prior art and reduce the number of active components, and provides a two-step method for preparing a nitrogen-doped carbon-supported cobalt tetroxide particle catalyst. The carbon source can make the carbon carrier have enough oxygen-containing functional groups to consume during pyrolysis, which greatly improves the thermal stability of cobalt tetroxide at high temperature; retains the active components in full contact with the reactants to improve the reaction efficiency

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