Preconditioning treatment to enhance redox tolerance of solid oxide fuel cells

a solid oxide fuel cell and redox tolerance technology, applied in the field of high temperature fuel cells, can solve the problems of significant degradation of the performance of the fuel cell, anode electrode re-oxidation, and substantial bulk volume change of the anode electrode, and achieve the effect of enhancing tolerance to the effects of redox cycling

Inactive Publication Date: 2006-06-29
VERSA POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0007] It is, thus, one object of this invention to provide a solid ...

Problems solved by technology

However, there are potentially several occurrences, such as air leakage into the anode side of the fuel cell due to seal leakage, fuel supply interruption, and emergency stops, which may cause the anode electrode to re-oxidize, forming an NiO/YSZ structure.
However, this reduction and oxidation process (referred to as redox cycling) results in substantial bulk volume changes of the anode electrode...

Method used

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  • Preconditioning treatment to enhance redox tolerance of solid oxide fuel cells
  • Preconditioning treatment to enhance redox tolerance of solid oxide fuel cells
  • Preconditioning treatment to enhance redox tolerance of solid oxide fuel cells

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Embodiment Construction

[0021] Although the invention is described herein in the context of solid oxide fuel cells and anode electrodes therefor, it will be appreciated by those skilled in the art that the basic principles of this invention may be advantageously applied to other high temperature fuel cells employing metal-containing anode electrodes that may be subject to redox cycling, and such other fuel cells and fuel cell components are deemed to be within the scope of this invention.

[0022] The invention disclosed herein is an anode electrode for a solid oxide fuel cell and a method for fabrication and preconditioning of the anode electrode which addresses the problems associated with redox cycling of the solid oxide fuel cell. FIGS. 1a, 1b and 1c show BSE SEM images of solid oxide fuel cell anodes in an as prepared, or sintered, state, after undergoing reduction by contact with a reducing gas, and after re-oxidation, respectively. FIGS. 2a, 2b, 2c and 2d show TEM images of solid oxide fuel cell anode...

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Abstract

A high temperature, redox tolerant fuel cell anode electrode and method of fabrication in which the anode electrode is pre-conditioned by application of an initial controlled redox cycle to the electrode whereby an initial re-oxidation of the anode electrode is carried out at temperatures less than or equal to about 650° C.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to high temperature fuel cells having metal-containing anode electrodes, in particular, solid oxide fuel cells and, more particularly, to solid oxide fuel cell anode electrodes. More particularly yet, this invention relates to solid oxide fuel cell anode electrodes that are redox tolerant, solid oxide fuel cells comprising such electrodes, and a method for enhancing the redox tolerance of such electrodes. [0003] 2. Description of Related Art [0004] Fuel cells are electrochemical devices that convert the chemical energy of a fuel into electrical energy with high efficiency. The basic physical structure of a fuel cell consists of an electrolyte layer with a porous anode electrode and porous cathode electrode on opposed sides of the electrolyte. In a typical fuel cell, gaseous fuels, typically hydrogen, are continuously fed to the anode electrode and an oxidant, typically oxygen from air, is cont...

Claims

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Application Information

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IPC IPC(8): H01M8/12H01M4/88H01M4/90
CPCH01M4/8621H01M4/8885H01M4/9066H01M8/04223Y02E60/50H01M8/2425H01M8/04225
Inventor WOOD, ANTHONYWALDBILLIG, DAVID
Owner VERSA POWER SYST
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