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Solid polymer fuel cell and method for activating same

A solid polymer, fuel cell technology, used in solid electrolyte fuel cells, fuel cells, fuel cell control, etc., can solve the problems of insufficient three-phase interface formation, and achieve improved power generation efficiency, catalyst efficiency improvement, and power generation efficiency improvement. Effect

Inactive Publication Date: 2009-08-12
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the three-phase interface (reaction site) cannot be sufficiently formed, so there is still room for improving power generation efficiency

Method used

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  • Solid polymer fuel cell and method for activating same
  • Solid polymer fuel cell and method for activating same
  • Solid polymer fuel cell and method for activating same

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Embodiment Construction

[0036] The present invention will be described below with reference to drawings schematically showing an electrode catalyst for a solid polymer fuel cell according to the present invention. refer to Figure 1 to Figure 3 , a polymer electrolyte represented by Nafion (registered trademark) is coated on a catalyst carrier formed of carbon nanohorn aggregates (Pt / CNH) on which a catalyst metal (eg, platinum) is supported.

[0037] figure 1 It is shown how the electrical resistance of the catalyst layer, in which carbon nanohorns are used as catalyst support, decreases when the catalyst layer is activated according to the invention by applying a voltage. Before activation, the catalyst layer has high electrical resistance due to the mesh of the polymer electrolyte. However, when a voltage is applied to the catalyst layer, the distance between adjacent carbon nanohorns decreases and the mesh of the polymer electrolyte is broken, so that the resistance of the catalyst layer decrea...

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Abstract

A solid polymer fuel cell has a catalyst layer including a nanohorn aggregate as a catalyst carrier, catalyst metal supported on the catalyst carrier, and a polymer electrolyte coating the catalyst carrier. Voltage higher than the open circuit voltage of the solid polymer fuel cell is applied to the catalyst layer so as to increase triphasic interfaces at which the reaction gas reduced at the catalyst layer, the catalyst metal, and the polymer electrolyte meet.

Description

technical field [0001] The present invention relates to a solid polymer fuel cell and a method of activating a solid polymer fuel cell. Background technique [0002] A solid polymer fuel cell having a polymer electrolyte membrane is easily constructed to be compact and lightweight, and thus is expected to be used as a power source for vehicles such as electric vehicles and small cogeneration systems and the like. [0003] The electrode reaction on the solid polymer fuel cell anode and cathode catalyst layer is at the three-phase interface where the corresponding reaction gas, catalyst, and fluorine-containing ion exchange resin (electrolyte) are mixed (will also be referred to as "reaction site" where appropriate) )Carried on. Therefore, in general, a catalyst layer in a solid polymer fuel cell is made of, as its material, carbon black having a large specific surface area, which supports a catalyst metal such as platinum, and is coated with a fluorine-containing ion exchang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04H01M8/10
CPCH01M2008/1095H01M4/92H01M4/926Y02E60/521H01M4/8878H01M8/04223H01M8/1004Y02E60/50H01M8/043H01M8/04302
Inventor S·库伦高特石丸洋一
Owner TOYOTA JIDOSHA KK