Thick Film Processing Challenges in the Realisation of a Co-Fired Solid Oxide Fuel Cell Roll

Abstract:

The Solid Oxide Fuel Cell Roll (SOFCRoll) is a novel design based on a double spiral. Combining structural advantages of tubular geometries with processing advantages of thick film methods, it utilises a single cofiring process. The initial concept used separate tape cast layers which were laminated before rolling. To optimise layer thickness to function, thinner screen printed layers were combined into the tape cast structure in 2^nd generation cells. This presented several processing challenges, such as achieving dense electrolyte layers, maintaining porous electrode and current collecting layers and incorporation of integral gas channels. Performance has been promising with open circuit voltages close to 1V and cell power of over 400mW at 800°C, however cracking is still evident. Therefore further iterations are in development where thinner layers are sequentially cast, aiming to improve interfacial bonding and better match plasticity and burn out to reduce cracking. This paper reviews key aspects of understanding and development of the SOFRoll , the challenges that have been tackled and what challenges remain, along with future directions for development and potential applications for this device.

• Periodical: Advances in Science and Technology (Volume 87)
• Pages: 98-104
• DOI: https://doi.org/10.4028/www.scientific.net/AST.87.98
• Online since: October 2014
• Authors: Mark Cassidy*, Paul Connor, Marielle Etches, Yann Kalecheff, Marina MacHado, Julie Nairn, John Irvine
• Keywords: CHP, Cofiring, Portable Power, Processing, Screen Printing, SOFC, SOFCRoll, Solid Oxide Fuel Cell, Tape Casting, Thick Film

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DOI: 10.1149/1.3569982

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