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SUMMARY: « Micro-solid oxide fuel cells for portable power sources »
DTSTART:20100511T090000
DTSTAMP:20260407T025717Z
UID:b845a0128941e52b1067c10be48e79302a8d34b65b6cf4f03d8be827
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Bo-Kuai Lai\, Harvard School of Engineering and Applied Sc
 iences\, Boston\nSolid oxide fuel cells (SOFCs) convert fuels such as hydr
 ogen\, natural gas\, and biomass into electricity through electrochemical 
 reactions. SOFCs that are primarily composed of thin films and fabricated 
 by photolithography are usually referred to as micro- SOFCs (µSOFCs). In 
 comparison to other electrochemical devices\, µSOFCs are predicted to pos
 sess the highest theoretical energy density. Therefore\, they hold tremend
 ous potential as fuel flexible\, long lasting\, lightweight\, and low emis
 sion portable power sources. However\, fabrication of µSOFCs is extremely
  challenging – very few µSOFCs have been experimentally demonstrated in
  the past decade. Moreover\, properties of materials used to create µSOFC
 s and thermomechanical behavior of ultrathin µSOFC membranes are still fa
 r from well understood. In this talk\, I will present the pathways towards
  robust\, large- area\, high-performance µSOFCs. Particular emphasis will
  be placed on the synthesis of high-quality\, crack-free La0.6Sr0.4Co0.8Fe
 0.2O3 (LSCF) cathodes by sputtering. The LSCF ultrathin films exhibit prop
 erties comparable to their bulk counterparts despite of their nanocrystall
 inity and low synthesis temperatures\, which are several hundreds of oC lo
 wer than conventional sintering methods\, Microstructure and microfabricat
 ion considerations\, as well as microstructure and stress engineering\, fo
 r large-area\, failure-resistant µSOFC membranes will be discussed. I wil
 l also present innovative in-situ electrical characterization approaches 
 – namely\, real-time probing of the effect of UV-irradiation and paralle
 l monitoring of µSOFC performance and deformation – to understanding hi
 gh- temperature behavior of LSCF cathodes and µSOFCs. Several novel µSOF
 C prototypes will be demonstrated\, including wafer- scale µSOFC arrays\,
  grid-supported µSOFCs\, µSOFC stacks\, and Pt-free µSOFCs. These proto
 types are stepping stones towards the realization of µSOFCs as portable a
 nd embeddable power sources.
LOCATION:CO 017
STATUS:CONFIRMED
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