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Preparation method of double-effect oxygen electrode catalyst with core-shell structure for fuel cells

A dual-effect oxygen electrode, core-shell structure technology, applied in battery electrodes, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of cumbersome preparation steps and harsh reaction conditions, and achieve Simple and effective preparation method, reduced loading, excellent oxygen reduction activity and oxygen evolution activity

Active Publication Date: 2014-12-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses a hydrothermal reaction method, the reaction conditions are relatively harsh, and the preparation steps are slightly cumbersome.

Method used

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  • Preparation method of double-effect oxygen electrode catalyst with core-shell structure for fuel cells
  • Preparation method of double-effect oxygen electrode catalyst with core-shell structure for fuel cells
  • Preparation method of double-effect oxygen electrode catalyst with core-shell structure for fuel cells

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Add cetyltrimethylammonium chloride (CTAC) to deionized water and stir to dissolve it completely. The mass fraction of CTAC in the solution is 0.2%.

[0027] 2. Add H to the above solution 2 IrCl 6 , stir evenly so that H 2 IrCl 6 The molar concentration is 1mmol / L.

[0028] 3. Heat the above solution to 60°C, then add NaBH 4 , such that NaBH 4 The ratio of the amount of substance to the Ir element is 30:1, and then react at 60° C. for 5 hours to obtain a sol of Ir.

[0029] 4. Add H to the above Ir sol 2 PtCl 6 , so that the atomic ratio of Pt to Ir is 1:2. Then add ascorbic acid so that the ratio of ascorbic acid to Pt is 30:1, and stir at 60° C. for 6 h.

[0030] 5. Centrifuge after the reaction, wash 3 times with ethanol and water respectively to obtain Ir 2 Pt 1 nanocatalyst.

Embodiment 2

[0032] 1. Add cetyltrimethylammonium chloride (CTAC) to deionized water and stir to dissolve it completely. The mass fraction of CTAC in the solution is 0.2%.

[0033] 2. Add H to the above solution 2 IrCl 6 , stir evenly so that H 2 IrCl 6 The molar concentration is 1mmol / L.

[0034] 3. Heat the above solution to 60°C, then add NaBH 4 , such that NaBH 4 The ratio of the amount of substance to the Ir element is 30:1, and then react at 60° C. for 5 hours to obtain a sol of Ir.

[0035] 4. Add H to the above Ir sol 2 PtCl 6 , so that the atomic ratio of Pt to Ir is 1:1. Then add ascorbic acid so that the ratio of ascorbic acid to Pt is 30:1, and stir at 60° C. for 6 h.

[0036] 5. Centrifuge after the reaction, wash 3 times with ethanol and water respectively to obtain Ir 1 Pt 1 nanocatalyst.

Embodiment 3

[0038] 1. Add Pluronic F127 in deionized water and stir to dissolve it completely. The mass fraction of F127 in the solution is 0.2%.

[0039] 2. Add H to the above solution 2 IrCl 6 , stir evenly so that H 2 IrCl 6 The molar concentration is 0.5mmol / L.

[0040] 3. Heat the above solution to 60°C, then add NaBH 4 , such that NaBH 4 The ratio of the amount of substance to the Ir element is 30:1, and then react at 60° C. for 5 hours to obtain a sol of Ir.

[0041] 4. Add H to the above Ir sol 2 PtCl 6 , so that the atomic ratio of Pt to Ir is 1:2. Then add ascorbic acid so that the ratio of ascorbic acid to Pt is 30:1, and stir at 60° C. for 6 h.

[0042] 5. Centrifuge after the reaction, wash with ethanol and water three times respectively to obtain the IrPt nano-catalyst.

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Abstract

The invention provides a preparation method of double-effect oxygen electrode catalyst with a core-shell structure for unitized regenerative fuel cells. The preparation method includes the following steps: firstly preparing nano dendritic crystal Ir by utilizing strong reducing agents, and then, depositing platinum on the surface of Ir by utilizing a weak reducing agent to obtain Ir@Pt nano particles with core-shell structure. The preparation method is simple and effective, and the particle size distribution of the obtained Ir@Pt catalysts with the core-shell structure is from 10nm to 20nm, and the Ir@Pt catalyst has nano dendritic crystal morphology. The preparation method is simple and effective, and moderate in reaction condition, and the obtained catalyst has good oxygen reduction and oxygen evolution activities, and can be perfectly applied to the unitized regenerative fuel cells.

Description

technical field [0001] The invention relates to a preparation method of a core-shell structure nano catalyst, in particular to a preparation method of a core-shell structure double-effect oxygen electrode catalyst applicable to an integrated renewable fuel cell. Background technique [0002] With the depletion of fossil energy and the development of renewable energy such as solar energy and wind energy, the application of renewable fuel cells (RFC) as an energy storage system on land and space has attracted great attention from all over the world. It can cooperate with renewable energy such as wind energy and solar energy to achieve self-sufficiency, and has the advantages of large energy storage capacity, high specific energy, no self-discharge, low environmental pollution, good reliability and maintainability, etc. Energy storage systems that replace traditional secondary batteries in the fields of space, military and mobile power sources. [0003] According to the differ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46H01M4/92
CPCY02E60/50
Inventor 邵志刚张耕秦晓平鲁望婷谢峰衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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