阅读说明：本技术 一种甲醇燃料电池用纳米复合催化材料及其制备方法 (Nano composite catalytic material for methanol fuel cell and preparation method thereof ) 是由 李铜玲 于 2018-06-15 设计创作，主要内容包括：本发明公开了一种甲醇燃料电池用纳米复合催化材料及其制备方法。该纳米复合催化材料通过在荧光微球上负载特定的纳米材料,提高了催化剂的催化效果,且减少了铂金属的添加,降低了成本,另外维生素E的添加作为还原剂,改善了催化材料的环境友好度,且保证了电流的稳定性。与现有技术相比,本发明催化材料,催化效果好,且性能稳定,适合产业化生产。(The invention discloses a nano composite catalytic material for a methanol fuel cell and a preparation method thereof. According to the nano composite catalytic material, the specific nano material is loaded on the fluorescent microsphere, so that the catalytic effect of the catalyst is improved, the addition of platinum metal is reduced, the cost is reduced, in addition, the addition of the vitamin E is used as a reducing agent, the environment friendliness of the catalytic material is improved, and the stability of current is ensured. Compared with the prior art, the catalytic material disclosed by the invention is good in catalytic effect, stable in performance and suitable for industrial production.)

1. The nano composite catalyst for the methanol fuel cell is characterized by comprising the following components in parts by weight: 1-8 parts of nano silver, 1-8 parts of graphene, 10-18 parts of hydroxymethyl cellulose, 48-58 parts of carbon powder, 0.1-0.5 part of mercaptobenzothiazole, 10-18 parts of cobalt hydroxide, 14-23 parts of fluorescent microspheres, 25-42 parts of ethylene glycol, 1-8 parts of furfural, 20-45 parts of chloroplatinic acid and 18-78 parts of vitamin E10.

2. The nanocomposite catalyst for a methanol fuel cell according to claim 1, comprising the following components in parts by weight: 6 parts of nano-silver, 4 parts of graphene, 12 parts of hydroxymethyl cellulose, 55 parts of carbon powder, 0.2 part of mercaptobenzothiazole, 12 parts of cobalt hydroxide, 20 parts of fluorescent microspheres, 35 parts of ethylene glycol, 5 parts of furfural, 32 parts of chloroplatinic acid and 15 parts of vitamin E.

3. The nanocomposite catalyst for methanol fuel cells as in claim 1, wherein the fluorescent microspheres are made of polystyrene with a particle size of 200-600 nm.

4. The method for preparing the nanocomposite catalyst for the methanol fuel cell according to claim 1, comprising the following steps: step 1, dispersing cobalt hydroxide in hydroxymethyl cellulose, and obtaining cobalt hydroxide solution after ultrasonic dispersion and uniform mixing; step 2, adding the fluorescent microspheres into deionized water, sequentially adding aqueous solutions of mercaptobenzothiazole and furfural, and carrying out thermal reaction to obtain mercaptobenzothiazole-coated fluorescent microspheres; dissolving chloroplatinic acid in deionized water, stirring for 1-3 hours at 25-30 ℃ until the chloroplatinic acid is completely dissolved, adding nano silver, graphene, carbon powder, ethylene glycol and vitamin E, shearing for 10-15 minutes by a high-speed shearing machine, then adding a cobalt hydroxide solution and mercaptobenzothiazole to wrap fluorescent microspheres, uniformly stirring, and carrying out hydrothermal reaction to obtain a semi-finished product; and (4) after the semi-finished product is subjected to spray drying, sintering to obtain the nano composite catalyst.

5. The method for preparing a nanocomposite catalyst for a methanol fuel cell according to claim 4, wherein the mass ratio of chloroplatinic acid, cobalt hydroxide and fluorescent microspheres in step 3 is 0.1-0.4: 1: 8-12.

6. The method as claimed in claim 4, wherein the sintering temperature in step 4 is 700-800 ℃.

Technical Field

The invention relates to a methanol fuel cell, in particular to a nano composite catalytic material for the methanol fuel cell and a preparation method thereof.

Background

A fuel cell is a chemical cell that directly converts energy released by a chemical reaction of a substance into electrical energy. It is characterized in that: 1. the energy conversion efficiency is high; the chemical energy of the fuel is directly converted into electric energy without a combustion process, so that the method is not limited by Carnot cycle. The fuel-electric energy conversion efficiency of the fuel cell system is 45-60%, and the efficiency of thermal power generation and nuclear power generation is about 30-40%. 2. The installation place is flexible; the fuel cell power station has small occupied area and short construction period, and the power of the power station can be assembled by cell stacks as required, so that the fuel cell power station is very convenient.

The electrocatalyst is the core of the fuel cell, which is also the key to limiting the commercialization of the fuel cell. Since Pt is used as a catalyst material, the cost of the fuel cell is high, which makes it difficult to be widely used. Research on how to add more fillers to a low-Pt or Pt-free catalyst, i.e., to improve the electrocatalytic activity and reduce the cost, is becoming more and more popular.

Application No. 201610018618.X, entitled a method of making a methanol fuel cell anode catalyst. The preparation method of the methanol fuel cell anode catalyst comprises the steps of preparing cobalt hydroxide suspension, phenolic resin coated polystyrene microspheres, platinum-carrying catalyst suspension and high-temperature calcination after spray drying to obtain the carbon-carried platinum catalyst with cobaltosic oxide as a cocatalyst. Although the invention improves the specific surface area and the catalytic activity, the catalyst has low environmental friendliness and complex preparation process.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a nano composite catalytic material for a methanol fuel cell and a preparation method thereof.

A nano composite catalyst for a methanol fuel cell comprises the following components in parts by weight: 1-8 parts of nano silver, 1-8 parts of graphene, 10-18 parts of hydroxymethyl cellulose, 48-58 parts of carbon powder, 0.1-0.5 part of mercaptobenzothiazole, 10-18 parts of cobalt hydroxide, 14-23 parts of fluorescent microspheres, 25-42 parts of ethylene glycol, 1-8 parts of furfural, 20-45 parts of chloroplatinic acid and 18-78 parts of vitamin E10.

The improvement is that the nano composite catalyst for the methanol fuel cell comprises the following components in parts by weight: 6 parts of nano-silver, 4 parts of graphene, 12 parts of hydroxymethyl cellulose, 55 parts of carbon powder, 0.2 part of mercaptobenzothiazole, 12 parts of cobalt hydroxide, 20 parts of fluorescent microspheres, 35 parts of ethylene glycol, 5 parts of furfural, 32 parts of chloroplatinic acid and 15 parts of vitamin E.

The improvement is that the material of the fluorescent microsphere is polystyrene with the particle size of 200-600 nm.

The preparation method of the nano composite catalyst for the methanol fuel cell comprises the following steps:

step 1, dispersing cobalt hydroxide in hydroxymethyl cellulose, and obtaining cobalt hydroxide solution after ultrasonic dispersion and uniform mixing;

step 2, adding the fluorescent microspheres into deionized water, sequentially adding aqueous solutions of mercaptobenzothiazole and furfural, and carrying out thermal reaction to obtain mercaptobenzothiazole-coated fluorescent microspheres;

step 3, dissolving chloroplatinic acid in deionized water, stirring for 1-3 hours at 25-30 ℃ until the chloroplatinic acid is completely dissolved, adding nano silver, graphene, carbon powder, ethylene glycol and vitamin E, shearing for 10-15 minutes by a high-speed shearing machine, then adding a cobalt hydroxide solution and mercaptobenzothiazole to wrap fluorescent microspheres, stirring uniformly, and carrying out hydrothermal reaction to obtain a semi-finished product;

and 4, spray drying the semi-finished product, and sintering to obtain the nano composite catalyst.

The improvement is that in the step 3, the mass ratio of the chloroplatinic acid to the cobalt hydroxide to the fluorescent microspheres is 0.1-0.4: 1: 8-12.

As a modification, the sintering temperature in step 4 is 700-800 ℃.

Has the advantages that:

the nano composite catalytic material reduces the addition of platinum metal, reduces the cost, enlarges the porosity and the specific surface area of the carrier by changing the structure of the carrier, improves the loading effect, ensures high current density and good conductivity, has simple preparation process and can realize industrialization.

Detailed Description

The present invention will be described in further detail below with reference to specific examples.