Here is the abstract you requested from the CICMT_2011 technical program page. This is the original abstract submitted by the author. Any changes to the technical content of the final manuscript published by IMAPS or the presentation that is given during the event is done by the author, not IMAPS.
|Ceramic Modules for Micro Solid-Oxide Fuel Cells (µ-SOFCs)|
|Keywords: microfabrication processes, µ-SOFCs, LTCC|
|Micro solid oxide fuel cells (µ-SOFCs) based on microfabrication processes are a promising alternative to batteries for supplying portable electronics, as very high energy densities may be achieved. However, a µ-SOFC module is quite complex, comprising 1) a gas processing unit (GPU) to process a convenient energy source such as lighter gas into a more usable form, 2) the energy-generating cells proper, and 3) a post-combustor. The mechanical integration of these elements and their fluidic and electrical interconnection into a single module is a very challenging task for micro-scale integration. Therefore, a modular low-temperature co-fired ceramic (LTCC) package is proposed, allowing individual testing and subsequent full integration of the different cell elements. The package functions as a hotplate, a mechanical support for the hot zone and as an electrical / fluidic interconnect, integrating slender bridges to minimise thermal conduction losses and thus allow convenient low-temperature electrical connections and fluidic ports. For applications requiring a better thermal expansion match to silicon / pyrex, a silicon / pyrex glass-sealant variant was also developed. The electrical / thermal characterisation of these packages is shown, demonstrating that the envisioned operating temperatures (500-550°C) may be conveniently achieved. Issues of reliably bonding and interconnecting the micro-fabricated silicon / glass active elements are also discussed. Finally, concepts for integrating the GPU and post-combustor into the LTCC structure are presented.|
|Dr. Thomas Maeder, Scientist
EPFL - Laboratoire de Production Microtechnique
Lausanne CH 1015,