Diffusion layer of URFC (unitized regenerative fuel cell) and preparation method thereof

A fuel cell and diffusion layer technology, which is applied to fuel cell components and other directions, can solve the problems of electrode performance degradation, increase in electrode resistance, and increase in dosage, and achieve reduced electrode resistance, adjustable affinity/hydrophobicity, and The effect of improving performance and diffusion mass transfer capacity

Active Publication Date: 2014-04-09
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

In URFC, it is necessary to use a strong corrosion-resistant material as the leveling layer, which is more hydrophilic than the traditional carbon powder material leveling layer. Therefore, if PTFE is also used as the hydrophobic agent, the same hydrophobic effect can be achieved. According to the experiment, the amount of PTFE has increased by about 8 times, which greatly increases the electrode resistance and significantly reduces the performance of the electrode, so there are defects that cannot be ignored.

Method used

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  • Diffusion layer of URFC (unitized regenerative fuel cell) and preparation method thereof
  • Diffusion layer of URFC (unitized regenerative fuel cell) and preparation method thereof
  • Diffusion layer of URFC (unitized regenerative fuel cell) and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Hydrophobic treatment of the substrate

[0040] Cut 2×2.5cm 2 The carbon paper was dipped in 1wt% PTFE emulsion for several times for hydrophobization treatment, and then fired at 360° C. for 1 hour to obtain the hydrophobization treatment carbon paper.

[0041]2) Under a nitrogen atmosphere in a glove box, perfluorooctyldimethylchlorosilane (FDTS) was prepared into a 0.1wt% solution with absolute ethanol, and 50 mg of IrO 2 / Ti catalyst, added to FDTS solution, IrO 2 The mass ratio of / Ti to FDTS is 100:1. The two were stirred at room temperature to cause a condensation reaction, then centrifuged, and dried to obtain pre-hydrophobic treated IrO 2 / Ti leveling layer.

[0042] The prepared pre-hydrophobic treated IrO 2 / Ti leveling layer, add ethanol, mix evenly, add 20mg of PTFE emulsion with a concentration of 20wt%, mix evenly to obtain a leveling layer slurry, and apply the slurry evenly on the carbon paper treated with hydrophobic treatment, and then reheat ...

Embodiment 2

[0053] 1) The hydrophobic treatment of the substrate is the same as in Example 1

[0054] 2) Under a nitrogen atmosphere in a glove box, perfluorooctyldimethylchlorosilane (FDTS) was prepared into a 0.1wt% solution with absolute ethanol, and 50 mg of IrO 2 / Ti catalyst, added to FDTS solution, IrO 2 The mass ratio of / Ti to FDTS is 100:10. The two were stirred at room temperature to cause a condensation reaction, then centrifuged, and dried to obtain pre-hydrophobic treated IrO 2 / Ti leveling layer.

[0055] The prepared pre-hydrophobic treated IrO 2 / Ti leveling layer, add ethanol, mix evenly, add 20mg of PTFE emulsion with a concentration of 20wt%, mix evenly to obtain a leveling layer slurry, and apply the slurry evenly on the carbon paper treated with hydrophobic treatment, and then reheat at 360°C Lower firing for 1 hour to obtain a catalytic leveling layer.

[0056] 3) 4) steps are the same as 3) 4) in embodiment 1.

[0057] pass image 3 It can be seen from the s...

Embodiment 3

[0060] 1) The hydrophobic treatment of the substrate is the same as in Example 1

[0061] 2) Under a nitrogen atmosphere in a glove box, perfluorooctyldimethylchlorosilane (FDTS) was prepared into a 0.1wt% solution with absolute ethanol, and 50 mg of IrO 2 / Ti catalyst, added to FDTS solution, IrO 2 The mass ratio of / Ti to FDTS is 100:20. The two were stirred at room temperature to cause a condensation reaction, then centrifuged, and dried to obtain pre-hydrophobic treated IrO 2 / Ti leveling layer.

[0062] The prepared pre-hydrophobic treated IrO 2 / Ti leveling layer, add ethanol, mix evenly, add 20mg of PTFE emulsion with a concentration of 20wt%, mix evenly to obtain a leveling layer slurry, and apply the slurry evenly on the carbon paper treated with hydrophobic treatment, and then reheat at 360°C Lower firing for 1 hour to obtain a catalytic leveling layer.

[0063] 3) 4) steps are the same as 3) 4) in embodiment 1.

[0064] Embodiment 1, 2 and 3 by changing the co...

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Abstract

The invention discloses a diffusion layer of a URFC (unitized regenerative fuel cell) and a preparation method thereof, and aims at providing the diffusion layer of the URFC with excellent hydrophobicity, electroconductivity and air permeability. By using the condensation reaction of a silane coupling agent with a hydrophobic functional group and a corrosion-proof leveling material to prepare the diffusion layer, the hydrophobic function of the diffusion layer is achieved, the traditional preparation method through PTFE (polytetrafluoroethylene) cladded hydrophobicity is changed, the purpose of hydrophobicity is realized, the electrode resistance is reduced, and the performance and the diffusion mass transfer capacity of the cell are greatly improved.

Description

technical field [0001] The invention relates to the field of fuel cell diffusion layers, in particular to the research field of an integrated renewable fuel cell diffusion layer. Background technique [0002] The integrated renewable fuel cell (Unitized Regenerative Fuel Cell, or URFC) is a kind of renewable fuel cell (Regenerative Fuel Cell, or RFC), which combines fuel cell technology with water electrolysis technology on the basis of hydrogen-oxygen fuel cells Combined with the developed new energy storage system with high specific energy. It is clean and environment-friendly, has high specific energy and specific power, can realize self-sufficient work with solar or wind energy, can meet the needs of long-term charging and discharging, is easy to miniaturize, and has extremely broad application prospects in aerospace, communication, military and other fields. [0003] URFC uses water electrolysis technology (electric energy +2H 2 O-2H 2 +O 2 ) and fuel cell technolog...

Claims

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Application Information

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