Carbon supported noble metal catalyst and method for preparing same

Abstract

The invention relates to a carbon-carrier metal catalyst, wherein the active component is 5-80%; the mol ration of metal atoms is 3:1-1:3; the metal diameter of catalyst is 1-4nm. And the production comprises that: adding active component, complex agent, alcohol reducer and carrier into solvent; functioning ultrasonic wave at room temperature, adding alkali material, adjusting the pH, adding nitrogen gas to protect reflux at normal pressure, or reacting at high-pressure kettle; cooling to room temperature, adding acid, breaking gel via ultrasonic wave; filtering, washing with water until there is no CI-ion detected; vacuum drying; thermally treating at inertia gas; cooling in nitrogen gas to obtain the carbon-carrier metal catalyst. The invention has simple process; the catalyst active component is two-dimension at the surface of carrier; it has small particles, low crystallization degree, high metal utilization, and high catalysis activity.

Description

technical field [0001] The invention belongs to the field of fuel cell catalysts, and specifically refers to a proton exchange membrane fuel cell catalyst, that is, a carbon-supported noble metal catalyst, and a preparation method of the catalyst. Background technique [0002] Fuel cells can directly convert chemical energy into electrical energy, and are recognized as an efficient and clean power generation technology. Among them, direct alcohol fuel cell (DAFC) and proton membrane fuel cell (PEMFC) have become the most adaptable fuel cell types due to their advantages such as low operating temperature, fast start-up, simple structure, and high energy conversion rate. However, the price of these two types of fuel cells is too high, the life is too short, and industrialization is difficult. The development of highly active and anti-poisoning catalysts is the most effective way to solve the above problems and is the key to the commercialization of fuel cells. [0003] The pr...

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Problems solved by technology

[0010] However, the above-mentioned preparation method still has defects. Since the stabilizer is closely combined with the metal particles after the reaction, the organic protective layer needs to be removed through high-temperature heat treatment or tedious washing procedures, especially high-temperature heat treatment, which increases the concentration of metal particles in the catalyst. Diameter, resulting in the aggregation of catalyst particles, so that the specific surface area of ​​the catalyst activity is reduced, and the catalytic performance is reduced

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