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Method for preparing phosphate-doped polybenzimidazole membrane electrode for fuel cell

A technology of polybenzimidazole membrane and benzimidazole, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of corroding catalyst active components, reducing the power generation performance of fuel cells, and being difficult to mix evenly. Moderate viscosity, good mechanical strength, good film-forming effect

Inactive Publication Date: 2012-01-25
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this patent, methanesulfonic acid and tetrafluoroacetic acid are used for dissolving polybenzimidazole compounds. These two acids are highly volatile and will corrode the active components of the catalyst during stirring and mixing with the catalyst; the patent disclosed In the preparation method, the solid material and the binder are mixed, and the two are not easy to mix evenly, which will reduce the power generation performance of the fuel cell

Method used

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  • Method for preparing phosphate-doped polybenzimidazole membrane electrode for fuel cell
  • Method for preparing phosphate-doped polybenzimidazole membrane electrode for fuel cell
  • Method for preparing phosphate-doped polybenzimidazole membrane electrode for fuel cell

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Embodiment 1

[0023] (1) Preparation of phosphoric acid doped poly[2,2'-(p-oxydiphenylene)-5,5'-dibenzimidazole] film: 5mmol (1.071g) 3,3',4,4 '-Tetraaminobiphenyl and 5mmol (1.291g) 4,4'-dicarboxydiphenyl ether were added to 20.0g of polyphosphoric acid containing 80% phosphorus pentoxide, and reacted at 150°C for 2 hours, then reacted at 190°C for 28 hours, then lowered the temperature, and precipitated into water; then neutralized with alkali, filtered, washed to neutrality, and vacuum-dried at 100°C to constant weight to obtain poly[2,2'- (P-oxydiphenylene)-5,5'-dibenzimidazole], its molecular weight is 20000; poly[2,2'-(p-oxydiphenylene)-5,5'-dibenzo Imidazole] 2.0g was dissolved in 20.0ml of dimethyl sulfoxide, and cast into a film at 80°C to obtain poly[2,2'-(p-oxydiphenylene)-5,5'-dibenzimidazole] Film; 2.0g poly[2,2'-(p-oxydiphenylene)-5,5'-bibenzimidazole] film was immersed in 40.0g 85wt% concentrated phosphoric acid for 2 days, and dried in vacuum at 120°C until constant Heavy,...

Embodiment 2

[0028] (1) Preparation of phosphoric acid-doped poly[2,2'-(p-oxydiphenylene)-5,5'-dibenzimidazole] film: 2.5mmol (0.5355g) 3,3',4, 4'-tetraaminobiphenyl and 2.5mmol (0.6455g) 4,4'-dicarboxydiphenyl ether were added to 22.0g of polyphosphoric acid containing 70% phosphorus pentoxide, under the protection of nitrogen, at 150°C React for 2 hours, then react at 220°C for 20 hours, then cool down, and precipitate into water; then neutralize with alkali, filter, wash until neutral, and vacuum dry at 100°C to constant weight to obtain poly[2,2 '-(p-oxydiphenylene)-5,5'-dibenzimidazole], its molecular weight is 4000; poly[2,2'-(p-oxydiphenylene)-5,5'-di Benzimidazole] 1.0g was dissolved in 5.0ml of N,N-dimethylacetamide, and cast into a film at 150°C to obtain poly[2,2'-(p-oxydiphenylene)-5,5' -dibenzimidazole] film; 1.0g poly[2,2'-(p-oxydiphenylene)-5,5'-dibenzimidazole] film was immersed in 100.0g 90wt% concentrated phosphoric acid for 1 day, 120 ℃ vacuum drying to constant weight...

Embodiment 3

[0032] (1) Preparation of phosphoric acid doped poly[2,2'-(p-oxydiphenylene)-5,5'-dibenzimidazole] film: 10mmol (2.142g) 3,3',4,4 '-Tetraaminobiphenyl and 10mmol (2.582g) of 4,4'-dicarboxydiphenyl ether were added to 19.0g of polyphosphoric acid containing 90% phosphorus pentoxide, and reacted at 50°C for 5 Hours, and then reacted at 200°C for 25 hours, then cooled down, and precipitated into water; then neutralized with alkali, filtered, washed to neutrality, and vacuum-dried at 100°C to constant weight to obtain poly[2,2'- (P-oxydiphenylene)-5,5'-dibenzimidazole], its molecular weight is 200,000; poly[2,2'-(p-oxydiphenylene)-5,5'-dibenzo Imidazole] 4.5g was dissolved in 45.0ml of 1-methyl-2-pyrrolidone, and cast into a film at 60°C to obtain poly[2,2'-(p-oxydiphenylene)-5,5'-diphenyl Dibenzimidazole] film; 4.5g poly[2,2'-(p-oxydiphenylene)-5,5'-dibenzimidazole] film was immersed in 9000.0g 70wt% concentrated phosphoric acid for 7 days, and vacuum baked at 120°C Dry to cons...

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Abstract

The invention discloses a method for preparing a phosphate-doped polybenzimidazole membrane electrode for a fuel cell. On the one hand, 4,4'-oxybis(benzoic acid) and 3,3',4,4'-biphenyltetramine serve as monomers to prepare poly[2,2'-(p-oxy- diphenylene)-5-5'-bisbenzimidazole], the poly[2,2'-(p-oxy-diphenylene)-5-5'-bisbenzimidazole] is cast to form a membrane, and the membrane is doped with phosphate to prepare an electrolyte membrane with good mechanical strength; on the other hand, in the process of preparing a phosphate-doped gas diffusion electrode, poly-[2,2'-(m-phenylene)-5,5'-bisbenzimidazole] is prepared into the gas diffusion electrode in the presence of a platinum / carbon catalyst, the gas diffusion electrode is doped with phosphate, the components are uniformly distributed, strong-volatility acid is not used in the process, and a process of mixing solid materials does not exist. The membrane electrode prepared by the method can be used for hydrogen-oxygen fuel cell power generation under the conditions that the temperature is higher than 100 DEG C and the humidification is not carried out. The open-circuit voltage is 0.845V, and the maximum power density is 191mW / cm<2> (560mA / cm<2>, 0.34V) under the conditions that the temperature of the fuel cell is 150DEG C and the humidification is not carried out. The preparation method has the advantages of controllable conditions in the technological process and good repeatability of the process.

Description

technical field [0001] The invention relates to a method for preparing a membrane electrode for a fuel cell, in particular to a method for preparing a phosphoric acid-doped polybenzimidazole membrane electrode for a fuel cell. Background technique [0002] The polymer electrolyte membrane fuel cell system is clean, efficient, low operating temperature and fast start-up, and has attracted much attention in the research and development of chemical technology in the new century. A traditional polymer electrolyte membrane fuel cell uses a cation exchange membrane as the electrolyte membrane, hydrogen as a fuel is directly supplied to the anode, and oxygen or air as an oxidant is supplied to the cathode. In the anode chamber, hydrogen dissociates under the action of the anode catalyst in the membrane electrode to generate protons and electrons, and the protons migrate to the cathode in the cation exchange membrane. The electrons pass through the external circuit and load, and co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88C08L79/04C08K3/32C08G73/18
CPCY02E60/50
Inventor 方亮房建华马紫峰郭晓霞
Owner SHANGHAI JIAOTONG UNIV