Publication

In situ redox cycle of a nickel-YSZ fuel cell anode in an environmental transmission electron microscope

Jan Van Herle, Aïcha Hessler-Wyser, Antonin Faes
2010
Journal Articles

Abstract

Environmental transmission electron microscopy is used in combination with density functional theory calculations to study the redox stability of a nickel/yttria-stabilized zirconia solid oxide fuel cell anode. The results reveal that the transfer of oxygen from NiO to yttria-stabilized zirconia triggers the reduction reaction. During Ni reoxidation, the creation of a porous structure, due to mass transport, accounts for the redox instability of the Ni-based anode. Both the expansion of NiO during a redox cycle and the presence of stress in the yttria-stabilized zirconia grains are observed directly. Besides providing an understanding of the Ni-YSZ anode redox degradation, the observations are used to propose an alternative anode design for improved redox tolerance. © 2010 Acta Materialia Inc.

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https://infoscience.epfl.ch/entities/publication/23a7932e-402f-456e-b6d6-c6dfcc11900c

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Jan Van Herle, Aïcha Hessler-Wyser, Antonin Faes
2010
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/23a7932e-402f-456e-b6d6-c6dfcc11900c

About this result

Related concepts (32)

Flow battery

A flow battery, or redox flow battery (after reduction–oxidation), is a type of electrochemical cell where chemical energy is provided by two chemical components dissolved in liquids that are pumped through the system on separate sides of a membrane. Ion transfer inside the cell (accompanied by flow of electric current through an external circuit) occurs through the membrane while both liquids circulate in their own respective space. Cell voltage is chemically determined by the Nernst equation and ranges, in practical applications, from 1.

Transmission electron microscopy

Transmission electron microscopy (TEM) is a microscopy technique in which a beam of electrons is transmitted through a specimen to form an image. The specimen is most often an ultrathin section less than 100 nm thick or a suspension on a grid. An image is formed from the interaction of the electrons with the sample as the beam is transmitted through the specimen. The image is then magnified and focused onto an imaging device, such as a fluorescent screen, a layer of photographic film, or a sensor such as a scintillator attached to a charge-coupled device.

Solid oxide fuel cell

A solid oxide fuel cell (or SOFC) is an electrochemical conversion device that produces electricity directly from oxidizing a fuel. Fuel cells are characterized by their electrolyte material; the SOFC has a solid oxide or ceramic electrolyte. Advantages of this class of fuel cells include high combined heat and power efficiency, long-term stability, fuel flexibility, low emissions, and relatively low cost. The largest disadvantage is the high operating temperature which results in longer start-up times and mechanical and chemical compatibility issues.

Related publications (32)

In situ redox cycle of a nickel-YSZ fuel cell anode in an environmental transmission electron microscope

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