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Ruthenium-rhodium alloy electrode catalyst and fuel cell comprising the same

An electrode catalyst, fuel cell technology, applied in solid electrolyte fuel cells, fuel cells, battery electrodes, etc., can solve problems such as cathode catalyst poisoning

Active Publication Date: 2007-05-02
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, we have found that it is possible to solve the problem of poisoning of cathode catalysts caused by methanol percolation phenomena and concentration limitations of oxidizing materials when non-platinum based catalysts including ruthenium-rhodium alloys are used instead of platinum or platinum alloy catalysts, As well as providing a high-quality and high-efficiency fuel cell due to excellent oxygen reduction activity

Method used

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  • Ruthenium-rhodium alloy electrode catalyst and fuel cell comprising the same
  • Ruthenium-rhodium alloy electrode catalyst and fuel cell comprising the same
  • Ruthenium-rhodium alloy electrode catalyst and fuel cell comprising the same

Examples

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Effect test

Embodiment 1～3

[0066] [embodiment 1~3] ruthenium-rhodium alloy catalyst and use this catalyst to prepare fuel cell

Embodiment 1

[0068] 1-1. Preparation of ruthenium-rhodium alloy catalyst (molar composition 2:1)

[0069] Weigh 0.408g (1.966mmol) ruthenium salt (from the RuCl of Aldrich company 3 ·xH 2 O) and 0.206g (0.983mmol) rhodium salt (from Aldrich company's RhCl 3 ·xH 2 O) and added to distilled water respectively. Each metal salt solution was stirred at room temperature (25°C) for 3 hours. Then, the metal salt solution was mixed and the resulting solution was stirred again for 3 hours. After adjusting the mixed metal salt solution to pH 8, 2 moles of sodium borohydride (NaBH 4 ) aqueous solution as a reducing agent to produce a precipitate of the reduced metal salt. Then, the precipitate was washed 3 times with distilled water, and then freeze-dried for 12 hours to prepare a ruthenium-rhodium alloy (2:1).

[0070] 1-2. Preparation of Membrane Electrode Assembly

[0071] at 5mg / cm 2 The amount of the ruthenium-rhodium alloy prepared in Example 1-1 and the conventional PtRu black catalyst...

Embodiment 2

[0075] Except using 0.305g (1.471mmol) ruthenium salt and 0.308g (1.471mmol) rhodium salt, repeat embodiment 1, to provide ruthenium-rhodium alloy catalyst (molar composition 1:1), comprise the MEA of this catalyst and comprise this MEA fuel cells.

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Abstract

Disclosed is an electrode catalyst comprising a ruthenium (Ru)-rhodium (Rh) alloy. A membrane electrode assembly (MEA) comprising the same electrode catalyst and a fuel cell comprising the same membrane electrode assembly are also disclosed. The ruthenium-rhodium alloy catalyst has not only good oxygen reduction activity but also excellent methanol resistance compared to conventional platinum and platinum-based alloy catalysts, and thus can be used as high-quality and high-efficiency electrode catalyst having improved catalytic availability and stability.

Description

technical field [0001] The present invention relates to an electrode catalyst for a fuel cell comprising a ruthenium-rhodium alloy and improving catalytic effectiveness and safety due to its excellent oxygen reduction activity and methanol barrier performance. The invention also relates to a membrane electrode assembly (MEA) comprising said catalyst and a high quality and high efficiency fuel cell, preferably a direct liquid dye cell, comprising said membrane electrode assembly. Background technique [0002] Recently, with the widespread distribution of portable electronic instruments and wireless communication devices, the development and research of fuel cells as portable energy sources, fuel cells for non-polluting automobiles, and energy-generating fuel cells as clean energy are intensively carried out. [0003] A fuel cell is an energy generation system that directly converts chemical energy provided by a fuel gas (hydrogen, methanol, or other organic substances) and an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/86H01M4/92H01M8/10
CPCH01M2008/1095H01M8/1004C22C5/04H01M2004/8689H01M8/1011Y02E60/523H01M4/925Y02E60/50H01M4/921H01L2924/12044H01M4/90
Inventor 朴真男李源镐金赫金敏淑成永恩崔淙淏朴寅洙南宇炫
Owner LG CHEM LTD