Journal
MRS BULLETIN
Volume 39, Issue 9, Pages 798-804Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/mrs.2014.171
Keywords
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Funding
- Center on Nanostructuring for Efficient Energy Conversion (CNEEC)
- Energy Frontier Research Center - US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001060]
- Fusion Research Program for Green Technologies of the National Research Foundation (NRF) of Korea - Ministry of Education, Science, and Technology (MEST) [NRF-2011-0019300]
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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.
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