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Electrolyte membrane, membrane electrode assembly, and fuel cell

A technology of membrane electrode assembly and electrolyte membrane, which is applied to solid electrolyte fuel cells, fuel cells, fuel cell components, etc., can solve the problems of methanol permeation, lower energy output, and unsuitability for long-term stable power supply, etc.

Inactive Publication Date: 2009-02-11
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Methanol permeation occurs in the electrolyte membrane due to the use of an organic polymer electrolyte
In addition, if the fuel cell is operated at a high temperature of not lower than 100°C for a long time, ion exchange groups such as sulfonic acid groups are decomposed and released to the outside, thereby reducing energy output
Therefore, this electrolyte membrane is considered unsuitable for long-term stable power supply

Method used

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  • Electrolyte membrane, membrane electrode assembly, and fuel cell
  • Electrolyte membrane, membrane electrode assembly, and fuel cell
  • Electrolyte membrane, membrane electrode assembly, and fuel cell

Examples

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no. 1 approach

[0024] First, the electrolyte membrane for a fuel cell according to the first embodiment of the present invention will be described below.

[0025] The electrolyte membrane for a fuel cell according to the first embodiment of the present invention includes a proton conductive inorganic material having super strong acidity and a porous membrane. The electrolyte membrane is mainly used to transfer the protons generated by the fuel oxidation reaction on the fuel electrode used as the anode to the oxidation electrode used as the cathode. The electrolyte membrane is also used as a separator that physically shields the fuel on the fuel electrode from the oxidant gas on the oxidation electrode.

[0026] The proton-conducting inorganic material with super strong acidity is formed of an inorganic oxide including at least one element selected from Ti, Zr, Hf, Nb, Al, Ga, In, Si, Ge, Sn, and Ce A first oxide of the element X, and a second oxide of Y combined with the first oxide and containi...

no. 2 approach

[0045] The second embodiment of the present invention relates to a membrane electrode assembly including a fuel electrode, an oxidation electrode, and an electrolyte membrane interposed between the fuel electrode and the oxidation electrode. The configuration and effects of the electrolyte membrane are basically the same as in the above-mentioned first embodiment of the present invention.

[0046] The fuel cell electrode includes a catalyst layer containing a redox catalyst, a proton conductor, and a binder such as an organic polymer binder. The catalyst layer mainly provides a reaction place for the oxidation-reduction reaction of fuel and oxidant on the electrode for fuel cell. The catalyst layer also provides a transport layer for protons and electrons formed and consumed in the redox reaction. Both the fuel electrode and the oxidation electrode are formed of a gas diffusive structure such as a porous body. Each of fuel gas, liquid fuel, or oxidant gas may be transmitted throug...

no. 3 approach

[0060] The fuel cell of the third embodiment of the present invention includes the membrane electrode assembly according to the second embodiment of the present invention.

[0061] The fuel cell according to the third embodiment of the present invention will be described below with reference to the drawings. in particular, figure 1 Shown is a schematic cross-sectional view of the fuel cell structure according to the third embodiment.

[0062] By stacking multiple unit cells one on top of the other, forming figure 1 The battery pack 100 of the liquid fuel cell is shown. The fuel introduction passage 1 is arranged on the side surface of the battery pack 100. Liquid fuel is supplied to the fuel introduction passage 1 from a liquid fuel tank (not shown) through an introduction pipe (not shown). It is preferable that the liquid fuel contains methanol. For example, methanol aqueous solution or methanol itself can be used as the liquid fuel. Each unit cell includes a membrane electrode...

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Abstract

An electrolyte membrane comprises a porous membrane and a proton conductive inorganic material loaded in the porous membrane. The proton conductive inorganic material has a super strong acidity. The proton conductive inorganic material contains a first oxide and a second oxide bonded to the first oxide. The first oxide contains an element X formed of at least one element selected from the group consisting of Ti, Zr, Hf, Nb, Al, Ga, In, Si, Ge, Sn and Ce. The second oxide contains an element Y formed of at least one element selected from the group consisting of V, Cr, Mo, W and B.

Description

Invention field [0001] The present invention relates to an electrolyte membrane, a membrane electrode assembly using the electrolyte membrane, and a fuel cell equipped with the membrane electrode assembly. Background technique [0002] In a fuel cell, a fuel electrode used as an anode is installed on one side of a proton conductive solid electrolyte membrane, and an oxidation electrode used as a cathode is installed on the other side of the electrolyte membrane. Fuel such as hydrogen or methanol is supplied to the anode. The oxidant is supplied to the cathode. The fuel undergoes electrochemical oxidation at the anode, producing protons and electrons. Electrons flow into the external circuit. On the other hand, protons migrate through the proton conductive electrolyte membrane to reach the cathode. The protons react with the oxidant and electrons from the external circuit to form water, and as a result, electricity can be generated. [0003] The proton conductive electrolyte membr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/86H01M8/10
CPCH01M8/1016Y02E60/521H01M2300/0071H01M2300/0091H01M8/1004Y02E60/50H01M4/86H01M8/02H01M8/10
Inventor 田村淳中野义彦梅武安田一浩
Owner KK TOSHIBA