Alloy nanocage catalyst and preparation method and application thereof

Abstract

The invention provides an alloy nanocage catalyst and a preparation method and application thereof. The catalyst contains an alloy of noble metal and non-noble metal. The catalyst is shaped as a flower-like hollow nanocage structure. According to the catalyst, non-noble metal partially replaces noble metal to form the alloy, the two metals have synergistic effect, the electronic structure is optimized, and catalyst stability is enhanced. The catalyst has an octahedron angle etched hollow structure. The structure is stable, and specific surface area is large. Meanwhile, application amount of noble metal is low, and catalyst cost is low. The catalyst is applied to direct methanol fuel cells, and catalytic activity for methanol oxidation can reach 800 A / g and above.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to an alloy nanocage catalyst as well as its preparation method and application. Background technique [0002] The energy problem is one of the major problems in today's society. With the increasing shortage of fossil energy, it is urgent to develop renewable energy and realize the effective use of energy. As a new energy efficient utilization technology, fuel cell can also be used as an important energy storage material due to its light weight and high energy density. Methanol is a clean and renewable energy source that is often used in the field of fuel cells. Due to its high energy density, high energy conversion rate, and simple operating system, direct methanol fuel cells have attracted widespread attention. There are two main reactions in the direct methanol fuel cell, that is, the oxygen reduction reaction and the methanol oxidation reaction, and the methanol oxidation reac...

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Problems solved by technology

Although the catalyst is composed of gold-nickel alloy, the overall structure of the catalyst has not been improved, and the hollow structure is difficult to control, which is not conducive to the optimization of the electronic structure and the improvement of the catalytic performance of methanol oxidation.

CN 108003355 A discloses a method for synthesizing hollow cubic PtCu nano-frame materials by a one-pot co-reduction solvothermal method, through the metal precursor platinum acetylacetonate and copper chloride, and then supplemented with regulatory molecules hexadecyl trimethyl Ammonium chloride, reducing agent ethanolamine, and solvent oleylamine were used to prepare PtCu nanoframe materials through solvothermal reduction, but the catalyst is mainly used for the reduction reaction of glycerol and oxygen, and the method has strict requirements on the reaction conditions. more difficult to form

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