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MEMS-based thin-film solid-oxide fuel cells

Published online by Cambridge University Press:  10 September 2014

Jihwan An
Affiliation:
Department of Mechanical Engineering, Stanford University, USA, and Seoul National University of Science and Technology, Korea; [email protected]
Joon Hyung Shim
Affiliation:
Department of Mechanical Engineering, Korea University, South Korea; [email protected]
Young-Beom Kim
Affiliation:
Department of Mechanical Engineering, Hanyang University, South Korea; [email protected]
Joong Sun Park
Affiliation:
Argonne National Laboratory, USA; [email protected]
Wonyoung Lee
Affiliation:
School of Mechanical Engineering, Sungkyunkwan University, South Korea; [email protected]
Turgut M. Gür
Affiliation:
Department of Materials Science and Engineering, Stanford University, USA; [email protected]
Fritz B. Prinz
Affiliation:
Departments of Mechanical Engineering and Materials Science and Engineering, Stanford University, USA; [email protected]
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Abstract

Thin-film solid-oxide fuel cells (TF-SOFCs) fabricated using microelectromechanical systems (MEMS) processing techniques not only help lower the cell operating temperature but also provide a convenient platform for studying cathodic losses. Utilizing these platforms, cathode kinetics can be enhanced dramatically by engineering the microstructure of the cathode/electrolyte interface by increasing the surface grain-boundary density. Nanoscale secondary ion mass spectrometry and high-resolution transmission electron microscopy studies have shown that oxygen exchange at electrolyte surface grain boundaries is facilitated by a high population of oxide-ion vacancies segregating preferentially to the grain boundaries. Furthermore, three-dimensional structuring of TF-SOFCs enabled by various lithography methods also helps increase the active surface area and enhance the surface exchange reaction. Although their practical prospects are yet to be verified, MEMS-based TF-SOFC platforms hold the potential to provide high-performance for low-temperature SOFC applications.

Type
Research Article
Copyright
Copyright © Materials Research Society 2014 

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