Catalyst for cathode in fuel cell

A fuel cell cathode and catalyst technology, applied in fuel cells, solid electrolyte fuel cells, battery electrodes, etc.

Inactive Publication Date: 2004-08-25
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are no reports on the development of catalysts with less reactivity towards methanol

Method used

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  • Catalyst for cathode in fuel cell

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Embodiment Construction

[0026] In a direct methanol fuel cell (DMFC), the catalyst used for the cathode must have low methanol oxidation reactivity and high oxygen reduction reactivity.

[0027] For the methanol oxidation reaction, the methanol (CH 3 OH) has gone through the reaction steps represented by the following reaction scheme 1:

[0028] Process 1

[0029]

[0030] According to reports, CH 3 The decomposition reaction of O is the rate-determining step in reaction scheme 1 [M. Mavrikakis and M.A. Barteau, J. of Molecular Catalysis A, 131, 135 (1998)]. CH 3 The decomposition temperature of O rises as the binding force between catalyst particles and oxygen increases or as the binding force between catalyst particles and hydrogen decreases [M.A.Barteau, Catal.Lett.8, 175(1991)].

[0031] To reduce the methanol oxidation reactivity of catalyst particles, a high CH 3 O decomposition temperature. In this regard, it is advantageous to increase the binding capacity of the catalyst particl...

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Abstract

A catalyst particle having high oxygen reduction reactivity and low methanol oxidation reactivity, a supported catalyst comprising the catalyst particle, and a fuel cell using a cathode comprising the supported catalyst are provided. The whole catalyst particle or at least the surface of the catalyst particle includes an alloy of two or more metals selected from the group consisting of Fe, Co, Ni, Rh, Pd, Pt, Cu, Ag, Au, Zn, and Cd. The alloy has a stronger oxygen-binding force than platinum or a weaker hydrogen-binding force than platinum.

Description

technical field [0001] The present invention relates to a fuel cell, in particular to a direct methanol fuel cell, and more particularly to a catalyst for the cathode of the direct methanol fuel cell. Background technique [0002] A fuel cell is an electrochemical device that generates electrical energy through the electrochemical reaction of fuel and oxygen. Because they are not subject to the thermodynamic constraints of the Carnot cycle, their theoretical power generation efficiency is very high. Fuel cells can be used as a power source of electrical energy for industrial, household, and automotive applications, as well as electrical / electronic products, especially portable appliances. [0003] Currently known fuel cells are classified into polymer electrolyte membrane (PEM) type, phosphoric acid type, molten carbonate type, and solid oxide type according to the type of electrolyte used in the cell. If the type of electrolyte changes, the operating temperature of the fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/86H01M4/92H01M4/96H01M8/00H01M8/10
CPCH01M4/8605H01M4/926Y02E60/523Y02E60/50H01M4/921H01M4/90
Inventor 李晟熏朴灿镐张申在光
Owner SAMSUNG SDI CO LTD
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