Preparation method for nano-alloy catalyst

A nano-alloy and catalyst technology, which is applied in the application field of nano-alloy catalysts in fuel cells, can solve the problems of cumbersome preparation process, methanol loss performance, and poor environmental protection, and achieve high activity, good stability, and safe and environmentally friendly reagents.

Inactive Publication Date: 2016-08-24
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are a series of corresponding problems with methanol as fuel: (1) commonly used platinum-based catalysts are easily poisoned by methanol oxidation intermediates; (2) methanol easily penetrates the proton exchange membrane to reach the cathode, resulting in loss and performance degradation; (3) methanol It is toxic, flammable and volatile, and there is a great risk in practical application
[0005] The prior art requires strict reaction conditions for the preparation of nanocatalysts, the organic solvents and reducing agents used in the preparation process are very toxic, and more reagent types are required, which has the disadvantages of cumbersome preparation process and poor environmental protection.

Method used

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  • Preparation method for nano-alloy catalyst

Examples

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Embodiment 1

[0032] Step 1, preparation of AuPd nanocatalyst

[0033] Reagent: KOH: 1mol / L; HAuCl 4 : 24.3mmol / L; PdCl 2 : 100mmol / L; hydrazine hydrate: 16.7mmol / L.

[0034] Dissolve 0.0428g aminoorotic acid in 1mL KOH solution for later use. Take 0.823mL HAuCl 4 solution and 0.5mL PdCl 2 The solution was placed in a 20mL beaker, and amino orotic acid-base solution and 7.677mL of secondary water were added, and magnetically stirred at a constant temperature of 15°C for half an hour. Then, 0.1 mL of hydrazine hydrate was added dropwise into the beaker, and magnetic stirring was continued at a constant temperature of 20° C. for 1 hour to obtain a suspension. Add secondary water to the obtained suspension, centrifuge and wash the precipitate 5 times until the supernatant of the washing liquid is clear, transparent and colorless, then add ethanol to the precipitate, centrifuge, wash 3 times, collect the black solid, 60 °C and dried for 12 hours to obtain the AuPd nanocatalyst.

[0035] ...

Embodiment 2

[0048] Step 1, preparation of AuPt nano-catalyst

[0049] Reagent: HAu(NO 3 ) 4 : 24.3mmol / L; H 2 PtCl 6 : 100mmol / L.

[0050] First configure 0.5% undecyltriazine sodium carbonate solution and 0.1mol / L ascorbic acid solution for later use. Take 5mL undecyltriazine solution and place it in a 20mL beaker at 30°C and stir, then add 0.823mL HAu(NO 3 ) 4 solution and 0.518mL H 2 PtCl 6 The solution was stirred for 10 min, then 1 mL of ascorbic acid solution and 2.659 mL of secondary water were added, and magnetically stirred at a constant temperature of 30° C. for 1 hour to obtain a suspension. Add secondary water to the suspension obtained from the reaction, centrifuge and wash the precipitate 5 times until the supernatant of the washing liquid is clear, transparent and colorless, then add ethanol to the precipitate, centrifuge and wash 3 times, and collect the black solid. Dry at 40°C for 48 hours to obtain the AuPt nanocatalyst.

[0051] 2 mg of the obtained AuPt nano...

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Abstract

The invention relates to a preparation method for a nano-alloy catalyst. The preparation method comprises the following steps of dissolving a guiding agent into an alkali solution, then adding a noble metal salt, noble metal acid and water to be stirred to obtain a mixed solution; adding a reducing agent to the mixed solution, continuing to stir to carry out a reduction action, and obtaining a turbid liquid after the reaction is completed; adding water to the turbid liquid, centrifuging, and washing precipitates, and adding alcohol to the precipitates, centrifuging and washing to obtain a black solid body; and collecting and drying the black solid body to obtain the nano-alloy catalyst. The preparation method for the nano-alloy catalyst provided by the invention is simple, convenient, rapid, safe and environment-friendly; and in addition, the prepared catalyst is high in activity, high in stability, and high in the catalysis capability for a fuel cell.

Description

technical field [0001] The invention relates to a nano-alloy catalyst, in particular to the application of the nano-alloy catalyst in fuel cells. Background technique [0002] At present, the direct methanol fuel cells existing in the market use liquid methanol as fuel, which has the characteristics of convenience, speed, and high conversion rate. However, there are a series of corresponding problems in the use of methanol as fuel: (1) commonly used platinum-based catalysts are easily poisoned by methanol oxidation intermediates; (2) methanol easily penetrates the proton exchange membrane and reaches the cathode, causing loss and performance degradation; (3) methanol It is toxic, flammable and volatile, and there are great risks in practical applications. [0003] Formic acid is a promising fuel to replace methanol: (1) formic acid has no toxicity; (2) formic acid is not easy to burn; (3) when formic acid is used as fuel, the concentration of formic acid can be much higher ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/9041Y02E60/50
Inventor 张钱丽居克俭陆赞李冬宁魏杰
Owner SUZHOU UNIV OF SCI & TECH
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