Double-metal co-doped carbon nano-composite material, double-metal-nitrogen-carbon nano-catalyst as well as preparation method and application thereof

Abstract

The invention discloses a double-metal co-doped carbon nano-composite material and a preparation method thereof. The composite material is prepared from a carbon substrate and ferrocene-phenylalanine and transition metal except iron, which are co-assembled on the carbon substrate through a non-covalent bond, wherein the ferrocene-phenylalanine, the transition metal except the iron and the carbon substrate commonly form a raspberry-like nanosphere structure. The invention further discloses a double-metal-nitrogen-carbon nano-catalyst obtained by mixing the composite material with dicyanodiamide and carbonizing and further provides application of the double-metal-nitrogen-carbon nano-catalyst to catalytic oxygen reduction reaction. The preparation methods of the composite material and the catalyst have simple steps and low cost and are suitable for large-scale application. The double-metal-nitrogen-carbon nano-catalyst provided by the invention has excellent electrochemical performance and has good methanol toxin resistance and stability, so that the double-metal-nitrogen-carbon nano-catalyst has a good application prospect in the field of the catalytic oxygen reduction reaction.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a bimetallic co-doped carbon nanocomposite material, a bimetallic-nitrogen-carbon nanocatalyst and a preparation method and application thereof. Background technique [0002] Fossil fuels are by far the main source of human energy. Unfortunately, fossil fuels are non-renewable resources and have very limited reserves in nature. Therefore, energy shortage is still a key problem to be solved urgently by mankind in the 21st century. As a power generation device with an energy conversion rate of up to 80%, which can greatly reduce air pollution, fuel cells have received more and more attention, especially in the United States, Japan, Canada, etc., and many important achievements have been made, and the market capacity will only continue expand. At present, there are mainly Toshiba ONSI in Japan, Balllard in Canada, GE / Plug, FuelCellEnergyInc. and M-CPower in the United St...

AI Technical Summary

Problems solved by technology

First, the electrocatalytic performance of the catalyst needs to be further improved, the cost needs to be further reduced, and the preparation method needs to be simplified to better meet the needs of large-scale production and application; second, the stability of the catalyst is not high, and the performance declines quickly. further improvement

According to reports by Liming Dai et al., the problem of stability comes from the fact that transition metals will be corroded, which will not only reduce the performance of the catalyst, but also pollute the fuel cell; third, the preparation of transition metal doped catalysts is mostly done in It is obtained by pyrolyzing a mixture of metal sources, nitrogen sources and carbon sources under high temperature conditions of 600 ° C to 1000 ° C, while atoms on the carbon substrate will migrate freely under high temperature conditions, resulting in inevitable metal aggregation, resulting in catalytic activity The number of sites decreases, thereby reducing the catalyst activity

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