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A catalytic layer structure that effectively reduces the pt load of fuel cells

A fuel cell and catalytic layer technology, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of short development time and lack of large-scale use, and achieve the effects of improving reaction efficiency, material transfer, and catalyst utilization

Active Publication Date: 2016-05-11
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

The ultra-thin electrode proposed by the US 3M company has a relatively short development time and has not yet been used on a large scale.

Method used

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  • A catalytic layer structure that effectively reduces the pt load of fuel cells
  • A catalytic layer structure that effectively reduces the pt load of fuel cells
  • A catalytic layer structure that effectively reduces the pt load of fuel cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare a catalytic layer structure consisting of two catalytic layers inside and outside, so that the Pt loads of the two catalytic layers are the same. The specific preparation method: first spray the first catalytic layer on the commercial Nafion membrane, and the spraying temperature is 60° , which is composed of 70wt% Pt / C catalyst and Naifon with an ion exchange equivalent of 900, and the Pt loading is 0.1mgcm -2 , the mass concentration of Nafion in the catalytic layer is 25wt.%; then the second layer of catalytic layer is sprayed, and the spraying temperature is 80°, which is composed of 40wt% Pt / C and Naifon with an ion exchange equivalent of 1100. Amount 0.1mgcm -2 , the mass concentration of Naifon in the catalytic layer is 15wt.%. figure 2 For the battery evaluation result of the prepared electrode of example 1 (operating condition during evaluation is H 2 / Air humidification temperature 65°, battery temperature 65°, H 2 The / Air stoichiometric ratio is ...

Embodiment 2

[0030] Prepare a catalytic layer structure composed of two catalytic layers inside and outside, so that the thickness of the two catalytic layers inside and outside is the same. The specific preparation method: first spray the first catalytic layer on the self-made reinforced composite membrane, and the spraying temperature is 50°. 70wt.% Pt / C catalyst and Naifon with an ion exchange equivalent of 950, Pt loading 0.28mgcm -2 , the mass concentration of Nafion in the catalytic layer is 18wt.%; then the second layer of catalytic layer is sprayed, and the spraying temperature is 70°, which is composed of 40wt% Pt / C and Naifon with an ion exchange equivalent of 1200. Amount 0.08mgcm -2 , the mass concentration of Naifon in the catalytic layer is 12wt.%. image 3 For the battery evaluation result of the prepared electrode of Example 2, the double-layer catalytic layer electrode is compared with the single-layer catalytic layer electrode in the figure (the operating condition durin...

Embodiment 3

[0032] Prepare a catalytic layer structure consisting of three catalytic layers. The specific preparation method: first, spray the first catalytic layer on the self-made reinforced composite membrane, the spraying temperature is 55°, and it is composed of 75wt.% Pt / C catalyst and ion exchange equivalent Composed of 950, Pt loading 0.12mgcm -2 , the mass concentration of Nafion in the catalytic layer is 20wt.%; then spray the second layer of catalytic layer, the spraying temperature is 65 °, which is composed of 55wt.% Pt / C and Naifon with an ion exchange equivalent of 1050, Pt Load 0.06mgcm -2 , the mass concentration of Naifon in the catalytic layer is 15wt.%; then spray the third layer of catalytic layer, the spraying temperature is 75 °, which is composed of 35wt.% Pt / C and Naifon with an ion exchange equivalent of 1150, Pt Load 0.02mgcm -2 , the mass concentration of Naifon in the catalytic layer is 11wt.%.

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Abstract

The invention provides a catalyst layer structure capable of effectively reducing fuel cell platinum (Pt) loading capacity. A catalyst layer is composed of a plurality of layers of single catalyst layers in different ingredients, and catalyst Pt loading capacity, ion conductor type, Pt loading capacity and a preparation process of each layer are different, so that the purposes of improving catalyst utilization rate and reducing the Pt loading capacity can be realized. In the reaction time of fuel cells, oxygen molecules diffuse from the catalyst layers to the interiors of the catalyst layers, and react with hydrogen protons moved from anodes. According to characteristics of the reaction of the fuel cells, oxygen diffuses from diffusion layers to the interiors of the catalyst layers and reacts with the hydrogen protons transmitted from the anodes to produce water. In the design of the catalyst layer structure, the Pt concentration and the ion conductor concentration of a catalyst layer close to the membrane side are improved in an emphasis mode so that reaction efficiency under intermediate and low current density is improved.

Description

technical field [0001] The invention relates to a catalyst layer structure capable of reducing the Pt load of a fuel cell. On the basis of the traditional fuel cell catalyst layer preparation process, the catalyst layer structure is redesigned to achieve the purpose of reducing the Pt load. Background technique [0002] Since the 1990s, proton exchange membrane fuel cells have been widely concerned by governments of various countries, energy, automobiles, home appliances and military industries, and the technology has developed rapidly. In recent years, it has been successfully applied in various fields such as automobiles, backup power supplies, mobile power stations, and underwater power system power supplies. [0003] Membrane electrode, as the core component of fuel cell, is usually composed of three parts: membrane, catalytic layer and diffusion layer, and is the place where chemical reactions inside the battery take place. The catalytic layer in the electrode is the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92H01M4/94
CPCY02E60/50
Inventor 宋微俞红梅邵志刚衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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