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Gas diffusion layer for unitized regenerative fuel cell, and its preparation method

A gas diffusion layer and fuel cell technology, which is applied in the parts of fuel cells, etc., can solve problems such as non-conductivity, achieve strong flexibility, solve high-potential corrosion, and light material.

Inactive Publication Date: 2013-01-02
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, there is a problem that the material itself is an insulating material and does not conduct electricity.

Method used

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  • Gas diffusion layer for unitized regenerative fuel cell, and its preparation method
  • Gas diffusion layer for unitized regenerative fuel cell, and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Hydrophobic treatment of the substrate

[0042] Cut 2×2.5cm 2 The carbon paper was soaked in 1wt% PTFE emulsion for multiple times for hydrophobic treatment, and then fired at 360°C for 1 hour to obtain the hydrophobized carbon paper;

[0043] 2) Add ethanol to the 50mg IrO2 / Ti leveling material, add 200mg20wt% PTFE emulsion after mixing evenly, obtain the leveling layer slurry after mixing evenly, apply the slurry evenly on the carbon paper after the hydrophobization treatment, and then Calcined at 360° C. for 1 hour to obtain a hydrophobic diffusion layer supported by carbon paper.

Embodiment 2

[0045] 1) Hydrophobic treatment of the substrate

[0046] Cut 2×2.5cm 2 The titanium fiber net is dipped in 1wt% PTFE (polytetrafluoroethylene) emulsion for many times to carry out hydrophobic treatment, and then baked at 360 ° C for 1 hour to make it hydrophobic;

[0047]2) Add ethanol to the 50mg IrO2 / Ti leveling material, add 200mg20wt% PTFE emulsion after mixing evenly, obtain the leveling layer slurry after mixing evenly, apply the slurry evenly on the carbon paper after the hydrophobization treatment, and then Calcined at 360° C. for 1 hour to obtain a hydrophobic diffusion layer supported by carbon paper.

Embodiment 3

[0049] Select polyethylene terephthalate synthetic fiber cloth (PET) as the support of the diffusion layer, and the preparation method of the diffusion layer is as follows:

[0050] 1) Pretreatment of the support body:

[0051] Divide 2×2.5cm 2 The organic fiber cloth is soaked in deionized water and ultrasonically oscillated for 30 minutes to remove impurities on the surface.

[0052] 2) Preparation of conductive microporous layer:

[0053] a. Take a certain amount of PVDF resin, add organic solvent DMF, and make a 7% solution;

[0054] b. Put the PVDF solution in a constant temperature water bath at 60°C, and stir continuously for 30 minutes until the PVDF is completely dissolved, and place it for defoaming for later use;

[0055] c. Add the conductive cross-linking material IrO2 / Ti into the PVDF solution, the ratio of IrO2 / Ti to PVDF is 3:1, put it on the stirrer and stir for 30min to make a paste hydrophobic conductive coating;

[0056] d. On the 80°C heating plate, fi...

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Abstract

The invention provides a gas diffusion layer for unitized regenerative fuel cell, and its preparation method. The gas diffusion layer comprises nonconductive organic synthetic fiber cloth as a support body, and conductive corrosion-resistance metal / metal oxide network formed on the support body and filled in the pores of the organic fibers. The gas diffusion layer further comprises a hydrophobic agent and a binder for achieving proper hydrophilic-hydrophobic property and good pore structure, so as to ensure mass transfer balance of the URFC in different work modes. The invention solves the corrosion problem of existing URFC support body, increases gravimetric specific power, and lowers electrode cost.

Description

technical field [0001] The invention relates to a fuel cell key material and a preparation method thereof, in particular to an integrated renewable fuel cell gas diffusion layer and a preparation method thereof. Background technique [0002] A regenerative fuel cell (RFC) is an energy storage system. In water electrolysis mode, water is electrolyzed into hydrogen and oxygen under the action of an external power supply; in fuel cell mode, hydrogen and oxygen are generated by The electrochemical reaction generates water and releases electrical energy at the same time, that is, the RFC energy storage system is composed of two components: a fuel cell (FC for short) and a water electrolyzer (WE for short). According to the two components in the system, FC and WE According to different combinations, the RFC can be divided into separate type, integrated type and integrated type (Unitized Regenerative Fuel Cell, URFC for short). [0003] URFC uses water electrolysis technology (ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02
CPCY02E60/50
Inventor 张华民刘波马海鹏邱艳玲董明全
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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