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Anode materials for PEM fuel cells

一种燃料电池、燃料的技术，应用在燃料电池、燃料电池助剂、固体电解质燃料电池等方向

Inactive Publication Date: 2010-08-04
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, all of these options have significant operational or practical disadvantages

Method used

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  • Anode materials for PEM fuel cells
  • Anode materials for PEM fuel cells
  • Anode materials for PEM fuel cells

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Embodiment Construction

[0030] now refer to figure 1 , shows a schematic diagram of a partial cross-section of the MEA 10 showing the effect of hydrogen deficiency. The MEA includes an anode 12, a cathode 14, and a solid polymer electrolyte 16 membrane sandwiched between the anode 12 and cathode 14 and in intimate contact with both. The MEA 10 is further divided into a normal operating region 18 (left side of the MEA) and a hydrogen deficient region 20 (right side of the MEA) for schematically illustrating the effects of hydrogen deficiency at the anode 12 . In the normal operating region 18 of the MEA 10, a supply of molecular hydrogen is oxidized at the anode 12 to generate protons and electrons. Protons then migrate through the membrane 16 toward the cathode 14, while electrons are released to a current collecting flow plate (not shown) configured to transport the electrons through an external load. Eventually the electrons are transported to the cathode 14 where they react with protons and supp...

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Abstract

The incorporation of tungsten-containing hydrogen spillover materials into a composite fuel cell anode can be helpful in preserving the carbon catalyst support materials in the fuel cell cathode during periods of hydrogen starvation. Preferred examples of such tungsten-containing hydrogen spillover materials are tungsten oxides and tungsten silicides. These materials, when physically mixed with catalyst-loaded carbon support particles in a composite anode, have shown the ability to promote hydrogen storage in amounts that, during a disruption of hydrogen gas flow, can postpone an anodic potential excursion into the oxygen evolution region for a period of at least several seconds.

Description

technical field [0001] The present invention relates to the selection of anode materials for mitigating the effects of hydrogen starvation in hydrogen consuming fuel cells using proton exchange membranes (PEM). More particularly, the present invention relates to the use of a hydrogen spillover material comprising a tungsten compound mixed with an anode catalyst material for delaying the onset of cathode performance degradation during temporary hydrogen starvation. Background of the invention [0002] Proton exchange membrane (PEM) fuel cells are largely considered the primary fuel cell technology candidates, especially for portable and automotive transportation applications. A typical PEM fuel cell generally includes a membrane electrode assembly (MEA), a pair of gas diffusion backing layers disposed adjacent each side of the MEA, and a pair of current collecting flow plates disposed adjacent each backing layer. The MEA, further composed of a solid polymer electrolyte membr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/10H01M4/90H01M4/94H01M4/96
CPCH01M4/926H01M4/92Y02E60/521H01M4/8647H01M8/04216H01M8/1002H01M8/1007Y02E60/50
Inventor I·C·哈拉莱B·梅佐吉G·C·加拉贝迪安M·P·巴洛格S·斯瓦西拉詹
Owner GM GLOBAL TECH OPERATIONS LLC