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A kind of preparation method of platinum-cobalt alloy catalyst

A platinum-cobalt alloy and catalyst technology, which is applied in the field of preparation of platinum-cobalt alloy catalysts, can solve problems such as potential safety hazards and unfavorable development of fuel cell catalysts, and achieve the effects of reducing difficulty, simple post-processing steps, and reducing use costs

Active Publication Date: 2022-05-13
WUXI WEIFU HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, most of the existing platinum alloy catalyst preparation processes use ethylene glycol as a solvent and sodium borohydride, hydrazine hydrate, etc. as reducing agents. These reagents have certain safety hazards to humans, animals, plants, and the environment.
In addition, in the traditional process, sodium salts, chloride ions and other impurity ions that have a negative impact on the performance of platinum-based catalysts will be introduced, which are not conducive to the development of fuel cell catalysts

Method used

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  • A kind of preparation method of platinum-cobalt alloy catalyst
  • A kind of preparation method of platinum-cobalt alloy catalyst
  • A kind of preparation method of platinum-cobalt alloy catalyst

Examples

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Effect test

Embodiment 1

[0035] A preparation method of a platinum-cobalt alloy catalyst, comprising the following steps:

[0036] After mixing 4mL 0.1mol / L cobalt nitrate aqueous solution and 4mL 0.1mol / L citric acid monohydrate aqueous solution, stir until a sol is formed; then add 0.57g platinum-carbon catalyst with a platinum loading of 40% into the above-mentioned sol system, After stirring and ultrasonic dispersion, adjust the pH to 8 with ammonia water; heat in a metal bath at 60°C until a gel is formed; transfer the gel to a tube furnace, keep it warm at 500°C for 1 hour in a nitrogen atmosphere, and cool to room temperature naturally Add a sulfuric acid solution with a concentration of 0.5mol / L to pickle and soak; after pickling, filter with ultrapure water, and finally dry it in a blast drying oven at 50°C to obtain a black powder that is a platinum-cobalt alloy catalyst.

[0037] Carry out X-ray diffraction (X-Ray Diffraction, be called for short XRD) analysis to the platinum-cobalt alloy c...

Embodiment 2

[0039] A preparation method of a platinum-cobalt alloy catalyst, comprising the following steps:

[0040] After mixing 6 mL of 0.1 mol / L cobalt nitrate aqueous solution and 8 mL of 0.1 mol / L citric acid monohydrate aqueous solution, stir until a sol is formed; then add 0.85 g of a platinum-carbon catalyst with a platinum loading of 40% to the above sol system, After stirring and ultrasonic dispersion, adjust the pH to 11 with ammonia water; heat in a metal bath at 90°C until a gel is formed; transfer the gel to a tube furnace, keep it warm at 600°C for 2 hours in a nitrogen atmosphere, and cool to room temperature naturally Add a sulfuric acid solution with a concentration of 0.4mol / L for pickling and soaking; after pickling, filter with ultrapure water, and finally dry it in a blast drying oven at 70°C to obtain a black powder that is a platinum-cobalt alloy catalyst.

Embodiment 3

[0042] A preparation method of a platinum-cobalt alloy catalyst, comprising the following steps:

[0043] After mixing 5mL 0.1mol / L cobalt nitrate aqueous solution and 7mL 0.1mol / L citric acid monohydrate aqueous solution, stir until a sol is formed; then add 0.76g platinum-carbon catalyst with a platinum loading of 40% to the above sol system, After stirring and ultrasonic dispersion, adjust the pH to 10 with ammonia water; heat in a metal bath at 150°C to form a gel; transfer the gel to a tube furnace, keep it warm at 400°C for 1.5 hours in a nitrogen atmosphere, and cool naturally to room temperature Add a sulfuric acid solution with a concentration of 0.7mol / L for pickling and soaking; after pickling, filter with ultrapure water, and finally dry it in a blast drying oven at 60°C to obtain a black powder that is a platinum-cobalt alloy catalyst.

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Abstract

The invention belongs to the technical field of new energy materials and applications, and in particular relates to a method for preparing a platinum-cobalt alloy catalyst. The preparation method of the platinum-cobalt alloy catalyst of the invention comprises the following steps: preparation of a catalyst precursor, high-temperature reduction of the precursor, high-temperature alloying of the catalyst, pickling of the catalyst and water washing of the catalyst. The present invention uses pure water as a solvent, which has safety and environmental protection issues; when the precursor is reduced at high temperature, the reducing agent is the carbon in platinum carbon, and no additional reducing agent is needed, which avoids the use of sodium borohydride or hydrazine hydrate, etc. Safety and environmental protection problems caused by toxic reagents; Gel is used as the precursor of platinum-cobalt alloy to prepare platinum-cobalt alloy oxygen reduction catalyst, which ensures the simultaneous reduction of platinum and cobalt; no sodium salt and chloride ions are added, which reduces the difficulty of product post-processing The present invention uses ammonia water to adjust the pH value of the system, and the post-treatment steps are simple; the transition metal cobalt is added to the platinum-carbon catalyst, which reduces the platinum loading of the catalyst while improving the performance of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of new energy materials and applications, and in particular relates to a preparation method of a platinum-cobalt alloy catalyst. Background technique [0002] Catalyst is one of the core components of proton exchange membrane fuel cells, and the performance of catalysts is closely related to battery performance. Existing oxygen reduction catalysts are mainly platinum-based catalysts and non-platinum-based catalysts. At this stage, non-platinum-based catalysts cannot meet the needs of commercialization. Platinum-based catalysts are currently recognized as the best oxygen reduction catalysts, but due to the scarcity of platinum resources, platinum-based catalysts cannot be commercially applied on a large scale. Therefore, the research and development of platinum-based catalysts at this stage are mostly focused on improving platinum utilization and reducing platinum loading. Therefore, platinum alloy catalys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92B82Y40/00
CPCH01M4/921H01M4/926B82Y40/00Y02E60/50
Inventor 张明张义煌华秋茹包喆宇刘倩陈杰李刚
Owner WUXI WEIFU HIGH TECH CO LTD
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