Preparation method of non-noble metal oxygen reduction electrocatalyst for cathode of fuel cell

A fuel cell cathode and non-precious metal technology, which is applied in the direction of battery electrodes, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of high preparation cost, and achieve the effect of simple process, easy control, and wide application prospects

Inactive Publication Date: 2013-06-12
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The problem of the present invention is to select a suitable non-precious metal material to prepare a catalyst with higher catalytic activity, so as to overcome the problem of

Method used

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  • Preparation method of non-noble metal oxygen reduction electrocatalyst for cathode of fuel cell
  • Preparation method of non-noble metal oxygen reduction electrocatalyst for cathode of fuel cell
  • Preparation method of non-noble metal oxygen reduction electrocatalyst for cathode of fuel cell

Examples

Experimental program
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Example Embodiment

[0030] Embodiment 1

[0031] (1) Take 1.5g of chitosan in a 250ml three-necked flask, add 90ml of ethanol aqueous solution (the volume ratio of ethanol to water is 5:4), heat and stir to swell the chitosan, and add 1.5ml of glacial acetic acid during the process to help Due to the rapid dissolution of chitosan, a viscous and transparent ethanol solution of chitosan is obtained, and the pH is between 4 and 5.5.

[0032] (2) The mixed solution of 3 ml of salicylaldehyde and 20 ml of absolute ethanol was slowly added dropwise to the transparent solution of (1) under constant stirring, heated to 79°C for reflux reaction for 10 hours, and filtered under reduced pressure to obtain a colloidal substance. Wash with absolute ethanol until the filtrate is colorless, and the filter cake is dried at 50°C to obtain the chitosan salicylaldehyde Schiff base compound.

[0033] (3) Measure 0.95 g of the chitosan salicylaldehyde Schiff base compound prepared in (2) into a three-necked flask, a...

Example Embodiment

[0037] Embodiment 2

[0038] (1) Weigh 0.90g chitosan (CS) into a 250ml three-neck flask, add 90ml ethanol aqueous solution (the volume ratio of ethanol to water is 5: 4), heat and stir to make chitosan swell, and add 1.5ml during the process Glacial acetic acid helps the rapid dissolution of chitosan to obtain a viscous and transparent chitosan ethanol solution with a pH of 4 to 5.5.

[0039] (2) Slowly add the mixed solution of 3 ml salicylaldehyde and 20 ml absolute ethanol dropwise into the transparent solution of (1) which is constantly stirred, heat to 79°C for reflux reaction for 10 hours, and filter under reduced pressure to obtain a gelatinous substance. Wash with absolute ethanol until the filtrate is colorless, and dry the filter cake at 50°C to obtain the chitosan salicylaldehyde Schiff base compound.

[0040] (3) Weigh 1.50g of the chitosan salicylaldehyde Schiff base ligand prepared in (2) into a three-necked flask, add 30ml of absolute ethanol, heat and stir to...

Example Embodiment

[0043] Embodiment 3

[0044] (1) Weigh 0.9g chitosan (CS) into a 250ml three-neck flask, add 90ml ethanol aqueous solution (the volume ratio of ethanol to water is 5: 4), heat and stir to make chitosan swell, and add 1.5ml during the process Glacial acetic acid helps the rapid dissolution of chitosan to obtain a viscous and transparent chitosan ethanol solution with a pH of 4 to 5.5.

[0045] (2) Mix 1.5 ml of salicylaldehyde and 20 ml of absolute ethanol in a dropping funnel, slowly add it dropwise to the solution of (1) under constant stirring, and heat and reflux at 79°C for 10 hours, then filter under reduced pressure , to obtain a gelatinous substance, which was washed with absolute ethanol until the filtrate was colorless, and the resulting filter cake was dried at 50°C to obtain a chitosan Schiff base ligand compound.

[0046] (3) Weigh 0.90g of the chitosan salicylaldehyde Schiff base ligand prepared in (2) into a three-necked flask, add 30ml of absolute ethanol, heat...

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Abstract

The invention relates to a preparation method of non-noble metal oxygen reduction electrocatalyst for the cathode of a fuel cell. The preparation method comprises the following steps of: enabling chitosan and salicylaldehyde to react in an ethanol solvent to obtain a chitosan salicylaldehyde Schiff base compound; then enabling the chitosan salicylaldehyde Schiff base compound and metal ions to react in the ethanol solution to obtain a solid crude product, and then washing and drying by using anhydrous ethanol to obtain a chitosan salicylaldehyde Schiff base metal complex; then mixing the chitosan salicylaldehyde Schiff base metal complex and high-purity graphite in an anhydrous ethanol solution, carrying out ultrasonic oscillation to react for 3 hours, filtering, washing and drying to obtain a carbon-supported metal-nitrogen-carbon composite catalyst, and then roasting under the protection of nitrogen at constant temperature to prepare a metal-nitrogen-carbon composite oxygen reduction electrocatalyst. The method disclosed by the invention can be used for preparing the non-noble metal oxygen reduction catalyst by taking the low-cost easily-available chitosan and non-Pt system metal as raw materials and has the advantages of low cost, simple preparation method, stability in structure and wide application prospect in the fuel cell.

Description

technical field [0001] The invention relates to a preparation method of a fuel cell oxygen reduction electrocatalyst, in particular to a preparation method of a fuel cell cathode oxygen reduction non-noble metal electrocatalyst. Background technique [0002] The main obstacle to the commercial application of proton exchange membrane fuel cells (PEMFCs) is that both the hydrogen anodic oxidation reaction (HOR) and the oxygen cathodic reduction reaction (ORR) require the use of expensive platinum-based catalysts, making the battery cost too high. Moreover, on platinum-based catalysts, the reaction rate of ORR is 6-7 orders of magnitude lower than that of HOR. To make up for this deficiency, more platinum loading is often required. Although platinum-based catalysts have the best selectivity for the 4e transfer reaction. But in a direct methanol fuel cell (DMFC), methanol diffuses to the cathode catalyst for direct oxidation reaction, generating a mixed potential and poisoning ...

Claims

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Application Information

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IPC IPC(8): B01J27/24H01M4/90
CPCY02E60/50
Inventor 张蓉刘芝平赵红崔子祥张晶马飞薛永强
Owner TAIYUAN UNIV OF TECH
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