US 2025/0015312 A1 · PLATINUM-CARBON CATALYST AND PREPARATION PROCESS AND USE THEREOF AND HYDROGEN FUEL CELL

Abstract

The present invention discloses a platinum-carbon catalyst and preparation process and use thereof and a hydrogen fuel cell with the platinum-carbon catalyst. A platinum-carbon catalyst contains a carbonaceous support and metallic platinum particles supported on the carbonaceous support. At least 50% of metallic platinum particles have a contact angle relative to the carbonaceous support of 70° or less. According to the platinum-carbon catalyst of the present invention, the metallic platinum particles have relatively good dispersion on the carbonaceous support, the catalyst has highly uniform cluster particles, and the metallic platinum and the carbonaceous support have a strong interaction each other, showing an improved electrochemical active surface area and a superior electrochemical stability. The process for preparing the platinum-carbon catalyst according to the present invention has the characteristics of batch repeatability and easy industrial scale-up, and can realize batch production of the platinum carbon catalyst.

Claims23

Dependent claims

A platinum-carbon catalyst containing a carbonaceous support and metallic platinum particles supported on the carbonaceous support, characterized in that at least 50% of metallic platinum particles have a contact angle relative to the carbonaceous support of 700 or less,

preferably, at least 55% of metallic platinum particles have a contact angle relative to the carbonaceous support of 70° or less, for example, 55-70% of metallic platinum particles have a contact angle relative to the support of 700 or less, or 60-70% of metallic platinum particles have a contact angle relative to the support of 700 or less;
further preferably, the contact angles of metallic platinum particles relative to the carbonaceous support are in the range of 400 to 70°;
based on the total amount of the platinum-carbon catalyst, the content of the metallic platinum is 20-70 wt %, the content of the carbonaceous support is 30-80 wt %;
preferably, based on the total amount of the platinum-carbon catalyst, the content of the metallic platinum is 50-70 wt %, the content of the carbonaceous support is 30-50 wt %.

1 more element

A process for preparing a platinum-carbon catalyst, the process comprises the following steps:

S1. a carbonaceous material, a platinum precursor, a complexing agent and a dispersion medium are dispersed to produce a first dispersion, the complexing agent is a carboxylate salt, the dispersion medium is C2-C4 dihydric alcohol and water, the volume ratio of the dihydric alcohol to water is 0.1-10:1, the molar ratio of the platinum precursor to the complexing agent is 1:0.1-10;
S2. the pH value of the first dispersion is adjusted to 8-14 to produce a second dispersion;
S3. a reducing agent is added to the second dispersion, so that the reducing agent comes into contact with the platinum precursor in the second dispersion for a reduction reaction, the reducing agent is an acidic organic reducing agent, the molar ratio of the reducing agent to the platinum precursor as platinum element is generally 5-1000:1.

Dependencies are inferred from the claim text.

Platinum-carbon catalyst and preparation process and use thereof and hydrogen fuel cell

Life of this patent

Platinum-carbon catalyst and preparation process and use thereof and hydrogen fuel cell

Life of this patent

Abstract

Claims23