Method for preparing carbon-loaded platinum-based electro-catalyst by microwave organosol method

Abstract

The invention provides a method for preparing a carbon-loaded platinum-based electro-catalyst by a microwave organosol method. The method comprises the following steps of: putting metal precursor solution and a complexing agent into an organic solvent, and adding a pretreated carrier carbon powder material under stirring, so that the finally-obtained catalyst comprises 20 to 50 mass percent of active ingredient; adjusting the pH value of the solution to be more than 8 by using alkaline solution, performing a microwave radiation heating reaction on the mixed solution, and adding acid solution after the reaction to adjust the pH to be less than 5; performing ultrasonic gel breaking on the reaction solution, performing suction-filtration and washing until the filtrate does not comprise chloride ions through detection; and drying filter cakes, grinding, performing activation heat treatment, and thus obtaining the carbon-loaded platinum-based electro-catalyst. The catalyst prepared by the method has small active ingredient particles, is dispersed on a carbon carrier to a great extent and has relatively high activity; and the method has a simple and quick preparation process, is low in cost and makes mass industrial production easily realized.

Description

technical field [0001] The invention belongs to the field of fuel cell electrocatalysts, and in particular relates to a method for preparing fuel cell carbon-supported platinum-based electrocatalysts by a microwave organic sol method. Background technique [0002] A fuel cell is a power generation device that converts chemical energy into electrical energy through electrode reaction without chemical combustion. As a new type of chemical power source, fuel cells have become the fourth power generation method after thermal power, hydropower and nuclear power. Fuel cells are highly valued by countries all over the world, and countries have invested heavily in research and development in order to realize their commercialization and popularization. [0003] In fuel cells, electrocatalysts play the role of electrochemical reaction "factories" and are the core materials in batteries. The development of electrocatalysts is one of the keys to fuel cells. At present, the catalysts w...

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Problems solved by technology

The platinum black catalyst prepared by this method has a small particle size of about 2.2nm, but this method is cumbersome, time-consuming, and requires the use of toxic compound solvents, which will cause environmental pollution and is not suitable for industrial production

[0009] In addition, the ion exchange method and the metal complex colloid method are also methods for preparing carbon-supported platinum-based catalysts, but they all have complex processes to varying degrees, are difficult to control, and are not conducive to mass production.

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