Carbon-supported CoN fuel-cell catalyst as well as preparation method and application thereof

Abstract

The invention relates to a carbon-supported CoN fuel-cell catalyst as well as a preparation method and application thereof. The catalyst comprises the following components in mass percentage: 40-99 percent of carbon material and 1-60 percent of active component. The catalyst is prepared through the following steps of: dispersing the components into a mortar loaded with a solvent, fully grinding until the solvent is completely volatilized, and obtaining a catalyst precursor after vacuum drying; and roasting for 2-4 hours by increasing the temperature for 200-900 DEG C at the speed of 20 DEG C/minute under the protection of an inert-gas atmosphere. The catalyst is applied to alkaline fuel cells, direct methanol fuel cells, direct ethanol fuel cells or low-temperature fuel cells. The catalyst is a non-platinum catalyst, so that the cost of the fuel cells can be markedly lowered; and the preparation method disclosed by the invention is simple and easy to operate, has low cost, is suitable for industrialized production and has good application prospects.

Description

technical field [0001] The invention belongs to the field of non-precious metal catalysts for fuel cells, and in particular relates to a carbon-supported CoN fuel cell catalyst and its preparation method and application. Background technique [0002] Polymer electrolyte fuel cells (PEFCs) are considered to be the preferred green energy technology in the 21st century due to their high power density, no pollution, low temperature operation (60-90°C), and environmental friendliness. Compared with other fuel cells, PEFCs can start quickly at room temperature and change output power rapidly according to load requirements, making them ideal alternative power sources for the most promising future electric vehicles, distributed power stations, backup power sources, and portable appliances. [0003] So far, fuel cells are still far away from real industrial applications. The key reason is that the effective catalysts for their anodes and cathodes are platinum (Pt)-based metal catalys...

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Problems solved by technology

The activity and stability of these macrocyclic compounds are greatly improved by high-temperature pyrolysis treatment (600-900°C), but the synthesis methods are complicated and the price is high, especially in the presence of proton exchange membrane fuel cells for strong acidic media. Higher activation polarization, its activity and stability still have a certain gap compared with Pt

[0005] Literature "Applied Chemistry", 27 (2010) 183 reported a method for preparing carbon-supported cobalt phthalocyanine catalyst by solid phase heating in one step and applied to the electrocatalytic reduction of oxygen under alkaline conditions, but the prepared by this method The average particle size of the CoPc / C composite is large (30nm), especially for the preparation of high-loaded catalysts, the particle size of the catalyst is difficult to control, and the particles of metal elements are not very uniformly dispersed on the carrier

Literature ["Acta Chemica Sinica" 66 (2008) 1015)] reported an alkaline fuel cell Co-N / The method of C composite catalyst, the catalyst shows good catalytic activity for oxygen reduction, but it also has the phenomenon of uneven catalyst particle size, particle size of 1-5 μm, agglomeration, etc., and its preparation process needs to be further optimized

The patent application numbers applied by Zhejiang University are 200910154535.3 and 200910098411.8. The disclosed method reports a composite catalyst prepared by using a conductive polymer to modify a carbon-supported nickel-based composite or cobalt hydroxide. This catalyst is prepared in a liquid phase, and colloidal The preparation of catalysts by the same method has the disadvantages of complicated operation and difficult control of the reaction process, which cannot well meet the requirements of fuel cell industrialization.

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