Preparing method for supported core-shell-structure catalyst for low-temperature fuel cell

A fuel cell, core-shell structure technology, used in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of large nanoparticles and poor distribution, and achieve uniform particle size distribution and small particle size. diameter, the effect of reducing the dosage

Inactive Publication Date: 2013-06-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology provides an improved way to make small particles with specific sizes distributed evenly over different materials like carriers without causing them to stick together too much during processing. It also allows for more efficient deposition onto these tiny supports while maintaining their original shape. Additionally, it improves the efficiency of oxidative fuel cell electrocatalysis processes due to its enhanced surface area exposed towards the reactant gases compared to conventional techniques such as reduced pressure pyrogenesis.

Problems solved by technology

This patents discuss how reducing costs while maintaining their performance remains important due to the use of expensive metals such as palladium (pac). To address these issues, researchers focus more heavily on developing new materials called “cobalt” based catalyst systems. These catalyst components include transition elements like iron(II), ruthenium(III)) and iridium(I)). Additionally, there is an urgent demand by consumers towards lower prices without compromising safety standards. Therefore, manufacturors want to develop a process where highly active catalyst material can be produced economically efficiently and uniformly within reasonable limits.

Method used

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  • Preparing method for supported core-shell-structure catalyst for low-temperature fuel cell
  • Preparing method for supported core-shell-structure catalyst for low-temperature fuel cell
  • Preparing method for supported core-shell-structure catalyst for low-temperature fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Add a certain amount of deionized water and Pluronic F127 into 4 single-necked flasks, stir to completely dissolve F127, and the mass fraction of F127 in the solution is 1.0%.

[0027] 2. Add 20% Pd / C (BASF) catalyst as the catalyst precursor to the above solution, so that the mass fraction of the catalyst precursor in the solution is 0.2%, stir and ultrasonically oscillate to make it uniformly dispersed.

[0028] 3. Add K to the above suspension 2 PtCl 4 , So that the ratio of the amount of Pt to Pd is 1:4, 1:3, 1:2, 1:1, respectively, and stir to dissolve them all.

[0029] 4. Add ascorbic acid to the above suspension, so that the ratio of the amount of ascorbic acid to Pt / Pd is 1:4, 1:3, 1:2, 1:1. The ratios were respectively 33.3:1, 25.5:1, 17.2:1, 8.5:1, and then stirred at room temperature for 12 hours.

[0030] 5. After the reaction, centrifuged, washed with water 3 times, and then dried at 80°C under vacuum for 10 hours. Record the obtained catalyst as Pd 4 Pt 1 / C,...

Embodiment 2

[0035] 1. Add a certain amount of deionized water and cetyltrimethylammonium chloride (CTAC) into a single-neck flask, stir to completely dissolve CTAC, and the mass fraction of CTAC in the solution is 0.2%.

[0036] 2. Add 20% Au / C as the catalyst precursor to the above solution so that the mass fraction of the catalyst precursor in the solution is 0.5%, stir and ultrasonically oscillate to make it uniformly dispersed.

[0037] 3. Add H to the above suspension 2 PtCl 6 , So that the ratio of the amount of Pt to Pd is 1:1, and stir to dissolve them all.

[0038] 4. Add formic acid to the above suspension so that the ratio of the amount of formic acid to Pt is 200:1, and then let it stand at room temperature for 4 hours.

[0039] 5. Centrifugal separation after the reaction, washing several times, and then drying at 60°C under vacuum for 12h. Record the obtained catalyst as Au 1 Pt 1 / C.

[0040] This example obtains Au 1 Pt 1 The cyclic voltammetry curve of / C and 20%Au / C is as Figure...

Embodiment 3

[0042] 1. Add a certain amount of deionized water and Pluronic P123 into a single-neck flask, stir to completely dissolve P123, and the mass fraction of P123 in the solution is 0.5%.

[0043] 2. Add 20% Pd / C (BASF) catalyst as the catalyst precursor to the above solution, so that the mass fraction of the catalyst precursor in the solution is 1.0%, stir and ultrasonically oscillate to make it uniformly dispersed.

[0044] 3. Add K to the above suspension 2 PtCl 4 , So that the ratio of the amount of Pt to Pd is 1:2, and stir to dissolve them all.

[0045] 4. Add citric acid to the above suspension so that the ratio of the amount of citric acid to Pt is 100:1, and then stir at 100°C for 3 hours.

[0046] 5. Centrifugal separation after the completion of the reaction, washing several times, and then drying at 80°C under vacuum for 10 hours.

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Abstract

The invention provides a method for preparing a supported core-shell-structure nanometer catalyst. A core is non-platinum or low-platinum metal, a casing is made of platinum, and the catalyst can be used as a low-temperature fuel cell catalyst. The preparation method comprises utilizing supported non-platinum or low-platinum metal nano-particles to serve as a catalyst precursor, utilizing a weak reducing agent to deposit reducing platinum on the surface of the non-platinum or low-platinum metal. The preparation method is simple and effective, the prepared cell structure catalyst has small particle size and even particle size distribution, and the catalyst has good dispersity. In addition, the catalyst can improve utilization rate of platinum, reduces use amount of platinum, and presents high catalytic activity to oxygen reduction reaction.

Description

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Claims

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Application Information

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Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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