Coated catalyst, preparation method thereof and application of coated catalyst in fuel cell

Abstract

The invention relates to a coated catalyst, a preparation method thereof and an application of the coated catalyst in a fuel cell. The inner layer of the coated catalyst is transition metal oxide nanoparticles, and the outer layer of the coated catalyst is a sulfur element and nitrogen element doped carbon coating layer. The sulfur, nitrogen and carbon doped and coated in the coated catalyst havethe effect of fixing the active sites of the catalyst while increasing the catalytic active sites, and cooperatively promote the oxygen reduction catalyzed reaction with the transition metal oxide nanoparticles, so that the coated catalyst has the better catalytic effect. Meanwhile, a compact oxidation film is easily formed on the surfaces of the transition metal oxide nano-particles after the high temperature treatment, in addition, a coating layer is also arranged on the surface, so that the coated catalyst has the better corrosion resistance. The catalyst with the coated structure has the better catalytic effect and higher corrosion resistance, the performance of the catalyst is superior to that of a commercial catalyst, and the preparation process is safe and environment-friendly, theflow is simple, the cost of used raw materials is lower, so that the coated catalyst has wide application prospect in the field of fuel cell catalysts.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a coated catalyst, its preparation method and its application in fuel cells. Background technique [0002] As a clean and efficient energy source, hydrogen energy is recognized as an effective means to solve the current environmental pollution and energy shortage. Proton exchange membrane fuel cells can efficiently convert the chemical energy in hydrogen into electrical energy, and are one of the best devices for utilizing hydrogen energy. Catalyst, as the key material of proton exchange membrane fuel cell, is the key factor restricting its performance and cost. Platinum-based materials are currently the most commonly used cathode redox reaction catalysts in fuel cells. However, platinum resources are limited and expensive, so the development of non-precious metal catalysts to reduce costs is of great significance for the commercialization of proton exchange memb...

AI Technical Summary

Problems solved by technology

However, methanol and formaldehyde have obvious toxic effects on the human body, and long-term exposure is easy to cause cancer; reducing agents such as sodium borohydride and hydrazine hydrate are strong, explosive and difficult to store, and the precious metal platinum is used, resulting in higher production costs.

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