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Catalyst and preparation method and application thereof

A catalyst and reaction technology, which is applied in the field of catalyst and its preparation, can solve the problems of difficulty in breaking the carbon-carbon single bond at the surface active site, low catalyst efficiency, slow kinetic process, etc.

Pending Publication Date: 2021-10-26
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as an important part of DEFC, the cost of catalyst accounts for about one-third of the cost of the entire fuel cell. ads The problem of strong adsorption and poisoning and the difficulty of breaking the carbon-carbon single bond in ethanol molecules leads to low catalyst efficiency

Method used

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  • Catalyst and preparation method and application thereof
  • Catalyst and preparation method and application thereof
  • Catalyst and preparation method and application thereof

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preparation example Construction

[0044] The invention provides a kind of preparation method of catalyst, comprises the following steps:

[0045] After the ethylene glycol aqueous solution, graphene oxide and chloroplatinic acid are first mixed, the pH value is adjusted to >7, and the first reduction reaction is carried out to obtain the first intermediate product system;

[0046] performing a second mixing of the first intermediate product system and a second reducing agent solution to perform a second reduction reaction to obtain the catalyst;

[0047] The second reducing agent in the second reducing agent solution includes ascorbic acid and / or formic acid;

[0048] The volume concentration of the ethylene glycol aqueous solution is 50%-75%.

[0049] In the present invention, unless otherwise specified, all preparation materials are commercially available products well known to those skilled in the art.

[0050] In the present invention, after the first mixing of ethylene glycol aqueous solution, graphene ...

Embodiment 1

[0070] Mix 150 mg of graphene oxide and 50 mL of an ultrapure aqueous solution of ethylene glycol with a volume concentration of 50%, add 99.55 g of chloroplatinic acid hexahydrate under stirring conditions, and add sodium hydroxide until the pH value of the resulting mixed solution reaches 12 , continue to stir for 30 minutes, after ultrasonication for 30 minutes, stir at a speed of 10 rpm and heat up to 90°C, the heating time is 50min, after holding for 2h, add 20mL of formic acid solution with a volume concentration of 0.15%, react at 90°C for 6h, continue Stir and naturally cool to room temperature, wash with 2L ultrapure water, filter, vacuum dry (the temperature of the vacuum drying is 60°C, and the time is 12h), grind to obtain a catalyst (the particle size of Pt is 3.06nm, denoted as Pt / RGO EG-50 ).

Embodiment 2

[0072] Preparation process with reference to Example 1, the only difference is that the volume concentration of the ultrapure aqueous solution of ethylene glycol is 66%, and the catalyst (Pt particle diameter is 2.48nm, denoted as Pt / RGO EG-66 ).

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Abstract

The invention relates to the technical field of fuel cell catalysis, in particular to a catalyst and a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: carrying out first mixing on an ethylene glycol aqueous solution, graphene oxide and chloroplatinic acid, adjusting the pH value to be greater than 7, and carrying out first reduction reaction to obtain a first intermediate product system; and carrying out second mixing on the first intermediate product system and a second reducing agent solution, and carrying out second reduction reaction to obtain the catalyst, wherein the ethylene glycol aqueous solution is an ethylene glycol aqueous solution, a second reducing agent in the second reducing agent solution comprises ascorbic acid and / or formic acid, and the volume concentration of the ethylene glycol aqueous solution is 50%-75%. By utilizing the preparation method provided by the invention, platinum metal with uniform size can be uniformly dispersed on the surface of reduced graphene oxide, so that the catalytic performance of the catalyst is improved.

Description

technical field [0001] The invention relates to the technical field of fuel cell catalysis, in particular to a catalyst and its preparation method and application. Background technique [0002] Against the background of the world's increasingly mature industrialization and growing population, people's demand for safe, clean, efficient and practical new energy is increasing. As a new type of energy conversion device, ethanol fuel cell (DEFC) has attracted the attention of new energy development workers due to its advantages of high conversion efficiency, low noise, high stability and environmental protection. However, as an important part of DEFC, the cost of catalyst accounts for about one-third of the cost of the entire fuel cell. ads The problems of strong adsorption and poisoning and the difficulty of breaking the carbon-carbon single bond in ethanol molecules lead to low catalyst efficiency. [0003] At present, the most commonly used anode catalyst for fuel cells is s...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/88H01M8/1011
CPCH01M4/926H01M4/88H01M8/1013Y02E60/50
Inventor 郭瑞华安胜利张捷宇周国治关丽丽彭继华黄伟光李一鸣王林敏姚仪帅
Owner INNER MONGOLIA UNIV OF SCI & TECH
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