A core-shell structure catalyst for fuel cells and its preparation and application

Abstract

The invention discloses a method for preparing a catalyst with a core-shell structure, which is used for a fuel cell and uses copper-modified platinum, palladium, etc. as the shell, and precious metals such as palladium, gold, etc. as the core. Specifically, the method includes using noble metals such as palladium and gold as substrates, reacting in a mixed electrolyte solution containing platinum and copper precursors or palladium and copper precursor solutions and citric acid, and utilizing copper in its underpotential deposition interval. , the noble metal shows selective preferential deposition, and the property of substitution reaction between copper and platinum or palladium can prepare copper-modified platinum shell or palladium shell, so as to obtain a core-shell structure catalyst with palladium or gold as the core. The method of the invention is environmentally friendly and has a controllable load, and the activity and stability of the catalyst for the oxygen reduction reaction are better than commercial platinum carbon catalysts. The electrode constructed based on the catalyst is used in a fuel cell, which can improve battery performance and Pt utilization, and reduce fuel cell cost.

Description

technical field [0001] The invention relates to a method for preparing a core-shell catalyst for catalyzing fuel cell electrode reactions, which uses noble metals such as palladium and gold as cores and copper-modified platinum and palladium as shells, and belongs to the field of electrochemistry. Background technique [0002] With the increasingly severe energy crisis and environmental pollution, the demand for new energy materials and new energy technologies in human production and life is becoming more and more urgent. As a power generation device that directly converts chemical energy into electrical energy, fuel cells have been used in electric vehicles, distributed power stations, aerospace, and underwater vehicles because of their high energy conversion rate, high energy density, and environmental protection. Initial applications have been achieved in many fields. The catalysts used on fuel cell electrodes are still dominated by platinum or platinum alloy catalysts w...

AI Technical Summary

Problems solved by technology

The catalysts used on fuel cell electrodes are still dominated by platinum or platinum alloy catalysts with excellent electrocatalytic performance. However, the extensive use of noble metal platinum limits the commercialization of fuel cells.

Images