Platinum-carbon catalyst, preparation method thereof and application of platinum-carbon catalyst in fuel cell cathode catalyst

Abstract

The invention discloses a platinum-carbon catalyst, a preparation method thereof and an application of the platinum-carbon catalyst in a cathode catalyst of a fuel cell, and the preparation method comprises the following steps: 1) preparing an aqueous solution of sugar, adjusting the pH value to 5-9, then carrying out hydrothermal carbonization reaction by adopting the solution, and drying to obtain a carbon carrier material; 2) preparing a mixed solution of glucose and a platinum precursor, and heating the mixed solution; 3) adding a dispersion liquid of a carbon carrier material, adjusting the pH value to 3-10, heating, and reacting; 4) cooling and separating a reaction product to obtain a platinum-carbon catalyst precursor; and 5) calcining to obtain the platinum-carbon catalyst. According to the preparation method, cheap saccharides are used as precursors to prepare the carbon carriers, pretreatment is not needed, nano platinum particles can be well dispersed, and the catalytic performance of the prepared catalyst on oxygen reduction is superior to that of a commercial platinum-carbon catalyst. Moreover, the method is green in reaction, simple in preparation process and suitable for industrial production, and has a wide application prospect in the field of fuel cell catalysts.

Description

technical field

[0001] The invention belongs to the technical field of synthesis of fuel cell cathode catalysts, and relates to a platinum carbon catalyst, its preparation method and its application in fuel cell cathode catalysts. Background technique

[0002] Proton exchange membrane fuel cell (PEMFC) has the advantages of high energy conversion efficiency, high power density, low operating temperature and low pollution. It is considered to be an ideal clean energy conversion device and the preferred energy source for green new energy vehicles. Among them, catalyst is the key material of proton exchange membrane fuel cell.

[0003] At present, many platinum-carbon catalysts use commercial carbon black, carbon nanotubes, etc. as carbon carriers when synthesizing, but the cost is relatively high, most brands rely on imports, and pretreatment is required before use, and concentrated acids, oxidants, etc. are often used. Chemicals are processed with cumbersome steps, which not...

Images