Difunctional electrocatalyst

Abstract

The invention belongs to the technical field of a new energy material, and concretely relates to a difunctional electrocatalyst. A preparation method of the difunctional electrocatalyst comprises thefollowing steps: mixing palladium salt, a reducing agent and dispersed beta-Mo2C, and performing a heating reaction for 20-28 h at the temperature of 70-200 DEG C; wherein the dispersed beta-Mo2C is asuspension of beta-Mo2C dispersed in an aqueous solution or an organic solvent, and a reducing agent is an organic matter capable of reducing Pd2+ to a Pd simple substance; and the organic matter isvitamin C and the organic solvent. The method employs a beta-Mo2C nanotube material and palladium salt for in-situ reduction, the beta-Mo2C-Pd composite electrocatalyst having two functions of electro-catalytic reduction of oxygen and electrocatalytic hydrogen evolution can be synthesized, the electrocatalyst has the advantages of novel structure, single form, good dispersibility, strong hierarchical structure, and multiple active sites; the preparation technology is simple and optimized, the production cost is reduced, and the method can be widely used for industrial production.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a dual-functional electrochemical catalyst. Background technique [0002] Social energy crisis and environmental problems are one of the main problems restricting the development of today's society. New energy conversion and storage methods and equipment are one of the effective ways to solve the above problems. Proton exchange membrane fuel cell is a kind of fuel cell. It has the advantages of low operating temperature, high energy conversion efficiency, environmental friendliness, high specific power, fast start-up, and simple structure. It can be used as a notebook computer, Power supply equipment for mobile phones, cameras, and electric vehicles can also be used in large-scale power plants, and has attracted widespread attention from society. The two poles of the proton exchange membrane fuel cell contain catalysts that accelerate the electrochemical...

AI Technical Summary

Problems solved by technology

However, the methods currently used for industrial hydrogen production are generally not in line with the "green and sustainable" energy development strategy

For example, although electrocatalytic hydrogen evolution is one of the green and efficient methods for producing hydrogen, there are problems such as expensive catalysts, low catalytic activity and poor stability. Therefore, how to design a hydrogen evolution catalyst with excellent performance and low cost is the current One of the challenges faced by a rapidly developing society

[0004] Traditional electrocatalytic hydrogen evolution catalysts are mostly prepared with noble metals Pt, Ir, and Ru, but these three noble metals are expensive and have very little earth content. At the same time, the poor stability of Pt, Ir, and Ru-based catalysts leads to low catalytic efficiency, which limits the electrocatalyst. Industrial Application of Catalytic Hydrogen Evolution Technology

Although transition metal carbides, sulfides, phosphides, nitrides and carbon materials have reduced costs, their performance and stability still cannot meet the needs of the development of electrocatalytic hydrogen evolution.

[0005] Platinum (Pt)-based materials are the most widely used in traditional fuel cell cathode catalysts, but due to their high price and very little earth reserves, they greatly increase the manufacturing cost of fuel cells, thus limiting the commercial use of Pt-based materials. application

Alloy nanomaterials composed of Pt and transition metals M (Fe, Co, Ni, Mn, Cu) have been applied to fuel cell cathode catalysts. Although the amount of Pt is reduced and the catalytic activity is high, the catalytic The performance decay is too fast and the production method is complicated, which still limits its commercial use in fuel cells

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