Method for synchronously preparing hierarchical pore cobalt and nitrogen co-doped nanorod loaded platinum-cobalt alloy nano oxygen reduction electrocatalyst

Abstract

The invention discloses a method for synchronously preparing a PtCo / Co-N-C catalyst. The preparation method comprises the following steps: homogenizing cobalt salt, zinc salt and ultrapure water, adding a 2-methylimidazole aqueous solution, uniformly stirring, adding a strong reducing agent aqueous solution, carrying out a mixing reaction, adding a platinum salt aqueous solution, carrying out a mixing reaction, centrifuging the product, cleaning, drying, and carrying out high temperature annealing in an inert gas environment to obtain the PtCo / Co-N-C catalyst. The method is simple and easy tooperate. The material with the PtCo nano-particle structure loaded on the Co-N-C nano-rod with the hollow structure is rapidly prepared. The preparation method is simple in process, easy to operate, suitable for large-scale production, short in reaction time, low in cost and clean, and the prepared PtCo / Co-N-C catalyst is used as a cathode oxygen reduction reaction catalyst of a hydrogen-oxygen fuel cell and shows excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic materials for electrochemical energy conversion, and relates to a method for synchronously preparing hierarchically porous cobalt and nitrogen co-doped nanorod-supported platinum-cobalt alloy nano-oxygen reduction electrocatalysts. Background technique [0002] The development of energy is an important driving force for the development of the national economy and is closely related to the survival and development of human beings. Coal, oil and natural gas are the three major fossil fuels that are non-renewable resources. In the past few decades, due to the continuous exploitation of fossil fuels, the global energy crisis has become more and more serious. At the same time, the use of fossil fuels produces a large amount of toxic and harmful substances, which not only have adverse effects on human health, but also pose a serious threat to the natural environment on which people depend. In ...

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Problems solved by technology

However, ZIP8 still has defects. In the oxygen reduction reaction, the kinetics of the dissociation and adsorption reaction of oxygen molecules is heavily dependent on the diffusion rate of oxygen. Since the ZIP8-derived carbon material has a positive dodecahedral structure and contains a large number of microporous structures, in the reaction It will be submerged by the generated water, which will cause a large number of active sites to fail to obtain sufficient oxygen mass transfer channels in the actual reaction, causing a large number of active sites to fail. Therefore, its structure does not have the characteristics that can promote electrolyte penetration and contact. Conducive to improving the catalytic effect of nano-catalytic materials for oxygen reduction reaction

In addition, the current carbon-based materials synthesized based on MOFs usually need to use some organic solvents, such as N.N-dimethylformamide (DMF), diethylformamide or methanol, although the reactant molecules have the characteristics of fast crystallization in organic solvents. , usually can obtain relatively small nanomaterials, but these organic solvents are toxic to human health and the environment, which limits the large-scale production of MOFs materials

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