Carbon-loaded platinum-yttrium catalyst and preparation method and application thereof

Abstract

The present invention discloses a carbon-loaded platinum-yttrium catalyst. Platinum acetylacetonate and yttrium acetylacetonate are used as a platinum source and a yttrium source, a platinum-yttrium material is obtained through a hydrothermal reaction, then the platinum-yttrium catalyst is obtained through carbon loading, and the obtained material has the low platinum content of 6.0-6.5%. The preparation method comprises the following steps: 1) preparing the platinum-yttrium material; and 2) preparing the carbon-loaded platinum-yttrium catalyst. When the carbon-loaded platinum-yttrium catalystis used as a fuel cell catalyst, the half-wave potential is 0.863 V, the mass activity is 0.09 Amg pt-1@0.9 V, and the electrochemical active surface area is 43-45 m2gpt-1. The whole technological process is simple, clean, environmentally friendly and free of danger, solves the problem of high raw material price, reduces platinum loading capacity and has excellent catalytic performance.

Description

technical field [0001] The invention belongs to the field of fuel cell catalysis, and in particular relates to a carbon-supported platinum yttrium catalyst and a preparation method and application thereof. Background technique [0002] With the rapid development of the world, the demand for energy is increasing day by day, and it is imminent to find a new energy source. As a new energy technology with high efficiency, low pollution and low cost, material battery has attracted extensive attention. At present, commercial battery catalysts are mainly Pt / C catalysts, which are expensive, which hinders the development of large-scale commercialization of proton exchange membrane fuel cells. [0003] The chloroplatinic acid impregnated inside and on the surface of Vulcan XC-72 carbon black was commercially reduced to platinum nanoparticles by chemical reduction method, and the half-wave potential of the prepared 40%Pt / C catalyst reached 0.868V. A disadvantage of materials obtained...

AI Technical Summary

Problems solved by technology

But at the same time, there is an obvious technical problem in this technical solution - the electrochemical corrosion method used is not only complicated in process flow, but more importantly, the electrochemical corrosion must be etched in 0.5M nitric acid

Among them, the use of nitric acid, a high-risk control drug, directly leads to the following two problems: 1. It is difficult to achieve large-scale preparation; 2. It requires high equipment and has certain risks.

This preparation process leads to the problem of high cost in the overall technical solution, which is not suitable for large-scale production

Although the contents of Pt and Y in the prepared PtY catalyst are 98.35% and 1.65% respectively, and the half-wave potential reaches 0.884V, this method also has the problem that the amount of Pt in the obtained PtY catalyst is too high

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