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Fuel cell catalyst slurry and application thereof

A catalyst slurry and fuel cell technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of unreasonable structure of electrode catalytic layer and gas diffusion layer, large concentration polarization loss in high current density area, reaction gas and liquid state Problems such as large water transfer resistance, to achieve the effect of ensuring consistency and repeatability, favorable pore size distribution, and high utilization rate

Inactive Publication Date: 2015-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current research on MEA shows that its existing problems are mainly concentrated in: the structure of the electrode catalytic layer and the gas diffusion layer is unreasonable, resulting in low catalyst utilization, high transfer resistance of reaction gas and liquid water, and extreme concentration difference in the high current density area. Large loss; battery output performance needs to be improved

Method used

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  • Fuel cell catalyst slurry and application thereof
  • Fuel cell catalyst slurry and application thereof
  • Fuel cell catalyst slurry and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Slurry 1 consists of catalyst 60%Pt / C, conductive polymer The solution and solvent are prepared by mixing and stirring water, ethylene glycol and n-propanol, and the sum of the mass of the organic solvent ethylene glycol and n-propanol in the solvent accounts for 66% of the total mass of the solvent. The viscosity of the catalyst slurry was 720 mPa·s, the solid content was 21 wt%, and the catalyst concentration was 17 wt%. Take 10 mL of the prepared slurry and put it in a small bottle to stand still, and observe whether the slurry settles after standing for a long time. A cathode catalytic layer for direct methanol fuel cells was prepared on the surface of the PTFE membrane by brushing the slurry 1, and the prepared catalytic layer was analyzed by a scanning electron microscope to observe its morphology and uniformity. After the catalytic layer printed on the surface of the PTFE membrane was dried, it was transferred to the surface of the Nafion115 membrane to form a ...

Embodiment 2

[0030] Slurry 2 is made of catalyst 40%Pt / C, conductive polymer The solution is prepared by mixing and stirring the solvent water, glycerol and n-propanol, and the mass of the organic solvent glycerin and n-propanol in the solvent accounts for 40% of the total mass of the solvent. The viscosity of the catalyst slurry is 1000 mPa·s, the solid content is 60 wt%, and the catalyst concentration is 55 wt%. The slurry was prepared by screen printing on the surface of carbon paper to form a proton exchange membrane fuel cell (PEMFC) cathode GDE (Gas Diffusion Electrode), and the prepared cathode catalytic layer, anode catalytic layer and corresponding diffusion layer were assembled into MEA and single Battery. The results show that the catalyst slurry has good stability, which can ensure the consistency and repeatability of batch preparation.

Embodiment 3

[0032] Slurry 3 is made of catalyst PtRu black, conductive polymer The solution is prepared by mixing and stirring the solvent water and isopropanol, and the organic solvent content in the solvent is 90%. The viscosity of the catalyst slurry is 100 mPa·s, the solid content is 5 wt%, and the catalyst concentration is 4 wt%. The viscosity of the slurry was 100 mPa·s. The slurry was prepared by screen printing on the surface of carbon paper to form a DMFC cathode GDE (Gas Diffusion Electrode), and the above prepared cathode catalytic layer, anode catalytic layer and corresponding diffusion layer were assembled into an MEA and a DMFC single cell. The catalyst in the catalyst slurry is uniformly dispersed, the catalyst utilization rate of the prepared catalytic layer is high, and the pore size distribution of the catalytic layer is favorable for gas-liquid mass transfer.

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Abstract

The invention discloses a preparation method of proton exchange membrane fuel cell catalyst layer slurry, the catalyst slurry components include a catalyst, a conductive polymer and a solvent, the catalyst slurry viscosity is 100-1000 mPa.s, and the solid content is 10 to 50 wt%. By controlling the final viscosity and the solid content of the slurry, the slurry form and catalyst layer preparation efficiency and effect can be ensured. A catalytic layer electrode prepared from the slurry can be used for assembly of a proton exchange membrane fuel cell membrane electrode (MEA Membrane Electrode Assemble) and the pore size distribution is more conducive to the gas-liquid mass transfer, and is conducive to the improvement of the performance and stability of the battery in a high current density range.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell, in particular to a catalyst slurry, and also relates to the application of the catalyst slurry. Background technique [0002] In recent years, the development of new clean energy, rational utilization of existing energy and environmental protection have become the basis for world economic development in this century. Fuel cells (Fuel Cells) are a power generation device that directly converts chemical energy into electrical energy without a combustion process. It has the outstanding advantages of high energy conversion efficiency, low pollution, and environmental friendliness. Power generation technology has become the focus of research and development by governments and large companies. Fuel cells are divided into alkaline type, phosphoric acid type, solid polymer type, molten carbonate type, solid oxide type, etc. due to different types of electrolytes. Solid polymer fuel cells (PEFC) a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/86
CPCY02E60/50
Inventor 孙公权景粉宁王素力
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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