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Medium-temperature proton exchange membrane fuel cell membrane electrode and preparation method thereof

A proton exchange membrane and fuel cell membrane technology, applied in fuel cells, battery electrodes, circuits, etc., can solve the problems of high fuel cell cost, battery performance degradation, severe swelling, etc., achieve high-power discharge performance, improve conductivity , reduce the effect of moisture volatilization

Inactive Publication Date: 2020-08-04
ZIBO TORCH ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Proton exchange membranes can be divided into perfluorosulfonic acid proton exchange membranes, non-fluoropolymer proton exchange membranes and partially fluorinated polymer proton exchange membranes, among which perfluorosulfonic acid proton exchange membranes have high proton conductivity and electronic insulation , chemical stability, thermal stability, mechanical strength, good dimensional stability and low gas permeability, but it has problems such as severe swelling, high price and fluorine release during degradation, while the performance of other types of proton exchange membranes Relatively poor, so proton exchange membrane technology is still under continuous research
[0005] Electrode catalysts include Pt, Ru, Pt / Ru, Pt / Ni, Pt / Pd, Pt / Co, Pt / Fe, Pt / Co / Cr and other noble metals, as well as transition metal macrocyclic compounds, nitrogen doped carbon, fluorine doped Carbon, transition metal oxides, transition metal nitrides and other non-precious metal catalysts, Pt is currently widely used as the catalyst material for proton exchange membrane fuel cells, because Pt is the catalyst with the highest oxygen reduction catalytic activity, but the oxygen reduction overpotential of Pt is relatively high And Pt particles will fall off, resulting in a decline in battery performance. In addition, because the important component of the membrane electrode is platinum-carbon catalyst, which accounts for about 40% of the total cost, the cost of the fuel cell is relatively high; Preparation method, and increase the electrochemical specific surface area of ​​Pt\C particles, and improve the catalytic activity of the catalyst by adding other components and utilizing its synergistic effect

Method used

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  • Medium-temperature proton exchange membrane fuel cell membrane electrode and preparation method thereof
  • Medium-temperature proton exchange membrane fuel cell membrane electrode and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0043] The preparation method of the membrane electrode of the medium temperature proton exchange membrane fuel cell specifically comprises the following steps:

[0044] (1) Hydrophobic treatment of the base layer

[0045] At room temperature, carbon paper was used as the base layer, and the base layer material was ultrasonically cleaned in deionized water for 30 minutes, then taken out and soaked in acetone solution for 12 hours, and then cleaned with deionized water and absolute ethanol in sequence. Put it in an oven at 60°C to dry for 0.5h, weigh it, put the base layer material into 2wt% hydrophobic agent and soak it for 5min, then take it out and put it in the oven to dry for 0.5h, repeat the soaking-drying process several times , until the content of the hydrophobic agent in the base layer reaches 15%, and finally put the base layer in a muffle furnace and heat it up to 240°C for 0.5h, and then heat up to 340°C for 0.5h to melt the PTFE and adhere to the surface of the ba...

Embodiment 2

[0056] The preparation method of the membrane electrode of the medium temperature proton exchange membrane fuel cell specifically comprises the following steps:

[0057] (1) Hydrophobic treatment of the base layer

[0058] At room temperature, carbon paper was used as the base layer, and the base layer material was ultrasonically cleaned in deionized water for 30 minutes, then taken out and soaked in acetone solution for 12 hours, and then cleaned with deionized water and absolute ethanol in sequence. Put it in an oven at 80°C to dry for 0.5h, weigh it, put the material of the base layer into 2wt% hydrophobic agent and soak it for 5min, then take it out and dry it in the oven for 0.5h, repeat the soaking-drying process several times , until the content of the hydrophobic agent in the base layer reaches 18%, and finally put the base layer in a muffle furnace and raise the temperature to 245°C for 0.5h heat treatment, then raise the temperature to 345°C and continue roasting for...

Embodiment 3

[0069] The preparation method of the membrane electrode of the medium temperature proton exchange membrane fuel cell specifically comprises the following steps:

[0070] (1) Hydrophobic treatment of the base layer

[0071] At room temperature, carbon paper was used as the base layer, and the base layer material was ultrasonically cleaned in deionized water for 30 minutes, then taken out and soaked in acetone solution for 12 hours, and then cleaned with deionized water and absolute ethanol in sequence. Put it in an oven at 100°C to dry for 0.5h, weigh it, put the base layer material into 2wt% hydrophobic agent and soak it for 5min, then take it out and dry it in the oven for 0.5h, repeat the soaking-drying process several times , until the content of the hydrophobic agent in the base layer reaches 20%, and finally put the base layer in a muffle furnace and raise the temperature to 250°C for 0.5h heat treatment, then raise the temperature to 350°C and continue roasting for 0.5h,...

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Abstract

The invention belongs to the technical field of fuel cells and particularly relates to a medium-temperature proton exchange membrane fuel cell membrane electrode and a preparation method thereof. Themembrane electrode comprises an anode microporous layer, an anode catalyst layer, a proton exchange membrane, a cathode catalyst layer and a cathode microporous layer which are sequentially arranged,and the anode catalyst layer and the cathode catalyst layer respectively consist of a hydrophilic catalyst layer and a hydrophobic catalyst layer. KAPPA-carbon black is contained in the anode microporous layer and the cathode microporous layer, and Pt / C catalysts are contained in the anode catalyst layer and the cathode catalyst layer. A binder used in the invention can improve the conductivity and proton transmission capability of an electrode; a used pore-forming agent enables the catalyst layers to obtain more uniformly distributed pores, the electrode can obtain more transmission channels,the reaction active area of the catalysts is increased, the power performance of the fuel cell is improved, vacuum heat treatment is adopted, the structural compactness of the catalyst layers is enhanced, the failure rate of the catalysts is reduced, and the service life of the catalysts is prolonged.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a membrane electrode of a medium-temperature proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] In recent years, the development momentum of fuel cell technology has greatly surpassed that of storage batteries. Although there are still various problems in the large-scale commercialization of fuel cells, its advantages in energy conversion rate and high and low emissions have gradually formed an industrial chain. In order to shorten the gap with the advanced technology at home and abroad, research has been carried out on the medium-temperature proton exchange membrane fuel cell with relatively mature technology. Its working temperature is -40℃~80℃, and it has strong environmental adaptability. Power support in tropical environment; Membrane electrodes are the core components of proton exchange membrane fuel cells, prov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1004H01M4/86H01M8/0234H01M8/0243H01M4/88
CPCH01M4/8605H01M4/8657H01M4/8828H01M4/8882H01M8/0234H01M8/0243H01M8/1004Y02E60/50Y02P70/50
Inventor 王玉莹陈龙霞唐胜群吴涛张涛李敏王弈聪唐慧芹张杰王强
Owner ZIBO TORCH ENERGY
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