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A membrane-electrode assembly for a fuel cell, a method of preparing the same and a fuel cell system including the same

A membrane electrode assembly, fuel cell technology, applied in the direction of fuel cell grouping, fuel cell parts, fuel cells, etc.

Inactive Publication Date: 2007-10-10
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although polymer electrolyte fuel cells have the advantage of high energy density, the disadvantage is that volatile hydrogen gas needs to be produced by auxiliary equipment such as fuel reforming processors for reforming methane or methanol, natural gas, etc.

Method used

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  • A membrane-electrode assembly for a fuel cell, a method of preparing the same and a fuel cell system including the same
  • A membrane-electrode assembly for a fuel cell, a method of preparing the same and a fuel cell system including the same
  • A membrane-electrode assembly for a fuel cell, a method of preparing the same and a fuel cell system including the same

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Embodiment approach

[0068]According to another embodiment of the present invention, a method of preparing a membrane electrode assembly includes: preparing a first proton-conducting polymer substrate; forming a coating comprising a second proton-conducting polymer on the first proton-conducting polymer substrate; The surface roughness is formed by assembling a metal thin film having surface roughness with the coating, and then pressing them; and removing the metal thin film from the substrate to prepare a polymer electrolyte membrane. Then, an anode and a cathode are connected on each side of the polymer electrolyte membrane.

[0069] More specifically, a proton-conducting polymer substrate is first prepared. Then, a coating comprising a proton-conducting polymer is formed on the substrate.

[0070] The method of preparing the substrate is not particularly limited, but may include any known method using a proton-conducting polymer. In addition, the proton-conducting polymer is the same as descr...

Embodiment 1

[0097] A commercially available NAFION 115 membrane (molecular weight: 500,000 to 800,000) used as the first proton-conducting polymer substrate was treated with 3% hydrogen peroxide at 90°C and treated with 0.5M sulfuric acid solution for 2 hours. Then, the membrane was washed with deionized water at 100 °C for 1 h to prepare H + Type NAFION 115 film (thickness 125 μm). A commercially available 5 wt% NAFION / H used as the second proton conducting polymer 2 O / 2-propanol (Solution Technology Inc., molecular weight: 80,000 to NAFION / H 2 An O / 2-propanol (Solution Technology Inc., molecular weight: 460,000 to 580,000) solution was coated on one side of the NAFION 115 membrane to form a 2 µm thick coating.

[0098] Etch the aluminum metal film with 0.1N hydrochloric acid solution for 20 minutes to form surface roughness, and then place it on the coating at 2000kg / m 2 pressure to form a surface roughness on the coating. Then, the aluminum metal film was dissolved with 0.5N hydroc...

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Abstract

The membrane-electrode assembly for a fuel cell includes an anode and a cathode facing each other, and a polymer electrolyte membrane interposed there between. The polymer electrolyte membrane includes a first proton conductive polymer substrate and a coating layer disposed on at least one side of the substrate. The coating layer includes a second proton conductive polymer, and may have a surface roughness. The first proton conductive polymer substrate has an endothermic peak in a higher temperature range than that of the second proton conductive polymer, as measured by a differential scanning calorimeter.

Description

technical field [0001] The present invention relates to a membrane electrode assembly for a fuel cell, a method of manufacturing the membrane electrode assembly, and a fuel cell system including the membrane electrode assembly. In particular, the present invention relates to a membrane electrode assembly having improved power characteristics due to increased reaction surface area between the polymer electrolyte membrane and the catalyst layer. Background technique [0002] A fuel cell is a power generation system that uses hydrocarbon substances, such as methanol, ethanol, or natural gas, to generate electricity through an electrochemical oxidation-reduction reaction of an oxidant and hydrogen. [0003] Such fuel cells are a clean energy alternative to fossil fuels. It includes battery stacks made up of unit cells and produces various ranges of power. Since it has an energy density four to ten times higher than that of a small lithium battery, it has been focused on being ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/86H01M4/88H01M8/10H01M8/24H01M8/04
CPCH01M8/1004H01M8/1023H01M8/1039H01M8/1053H01M8/1067H01M2300/0082H01M2300/0094Y02E60/521Y02E60/50Y02P70/50H01M4/86H01M4/88H01M8/02
Inventor 韩相日孙寅赫
Owner SAMSUNG SDI CO LTD
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