Abstract
Higher energetic density, better resistance to thermal stresses and smaller starting times as compared with conventional planar stacks, make the so-called microtubular SOFC (mT-SOFCs with diameters in the millimeter size region) devices suitable for portable applications in the sub kW energy range. However, fabrication of mT-SOFCs is a challenging process where a number of ceramic layers with different compositions and characteristics have to be placed together in the cylindrical device. Several co-sintering processes have to be performed at different temperatures and using distinct atmospheres to complete cell fabrication. In this review we summarize recent activity in the field of fabrication and characterization of mT-SOFCs, including the use of mT-SOFCs for steam electrolysis.
Highlights
ENERGY RESEARCHFabrication methods and performance in fuel cell and steam electrolysis operation modes of small tubular solid oxide fuel cells: a review
High temperature ceramic solid oxide fuel cells (SOFCs) are well-known electrochemical devices that directly convert, in a very efficient way, the chemical energy of hydrogen-enriched fuels, including hydrocarbons, into electricity and heat power (Singhal and Kendall, 2003; Cooley, 2009)
Conventional SOFCs consist of an anode made of a Ni–YSZ (Yttria Stabilized Zirconia) porous cermet, an YSZ electrolyte and a lanthanum strontium manganite, La1−xSrxMnO3 (LSM) cathode. They are manufactured in planar or tubular geometries, and the structural cell component can be any of the electrodes or the YSZ electrolyte itself. These SOFCs are large devices used for stationary applications that present long start-up and shutdown times, as well as extremely low thermal shock resistance
Summary
Fabrication methods and performance in fuel cell and steam electrolysis operation modes of small tubular solid oxide fuel cells: a review. Better resistance to thermal stresses, and smaller starting times as compared with conventional planar stacks, make the so-called microtubular SOFC (mT-SOFCs with diameters in the millimeter size region) devices suitable for portable applications in the sub kilowatt energy range. Fabrication of mT-SOFCs is a challenging process, where a number of ceramic layers with different compositions and characteristics have to be placed together in the cylindrical device. Several co-sintering processes have to be performed at different temperatures and using distinct atmospheres to complete cell fabrication. We summarize recent activity in the field of fabrication and characterization of mT-SOFCs, including the use of mT-SOFCs for steam electrolysis
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