Method for Preparing Fuel Cell Electrode Catalyst and Solid Polymer Fuel Cell

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This patent describes a new method for preparing a high-performance catalyst for fuel cell electrodes, especially for solid polymer fuel cells. The method involves mixing a nitrogen-containing metal complex (such as a porphyrin derivative with a transition metal) with tin oxalate, baking the mixture in an inert gas atmosphere, and then removing the formed metal tin via acid treatment. The process can also include steps such as ultrasound treatment and further baking to enhance catalyst performance. The resulting catalyst has a high surface area and improved oxygen reduction activity, leading to better fuel cell performance, particularly at high voltages.

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• Electrodes in solid polymer (proton exchange membrane) fuel cells for electric vehicles.
• Stationary power generation systems using fuel cells.
• Portable fuel cell-powered devices.
• Replacement or alternative catalyst materials for platinum-based fuel cell electrodes.
• Low-cost, high-efficiency catalysts for green hydrogen applications.

BenefitsContent extracted from patent full text and abstract with AI.

• Enables fuel cell catalysts with higher oxygen reduction activity, increasing fuel cell efficiency.
• Reduces the dependence on expensive platinum-group metals by allowing the use of alternative metals (Co, Fe, Ni, etc.).
• Improves the porosity and surface area of the catalyst, leading to higher current density and better performance at high potentials.
• The preparation method is versatile, adaptable to various macrocyclic metal complexes and transition metals.
• Potentially lowers the cost of fuel cell systems and supports wider commercialization.
• May improve durability and operational lifespan of fuel cell electrodes due to optimized pore structure.

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Patent Abstract

According to the present invention, the catalyst performance of a chelate catalyst comprising a complex of a macrocyclic compound such as a porphyrin derivative is improved. Also, the following method is provided: a method for preparing a fuel cell electrode catalyst comprising a nitrogen-containing metal complex in which a metallic element is coordinated with a macrocyclic organic compound, such method comprising the steps of: adding tin oxalate to the nitrogen-containing metal complex; and baking a mixture of the nitrogen-containing metal complex and tin oxalate in an inert gas atmosphere, wherein elution of metal tin is carried out via acid treatment.