Micro-Tubular Solid Oxide Fuel Cells with One Closed-End Fabricated Via Dip-Coating and Co-Firing

Abstract

The tubular solid oxide fuel cells (SOFCs) with one closed-end configuration have high thermal-cycling tolerance owing to the capability of expanding and shrinking freely in response to thermal stresses. The tubular cells with one closed-end have simple sealing requirements, and enable making the stacks with uniform temperature distribution. In this study, anode supported micro-tubular SOFCs with one closed-end were manufactured successfully by dip-coating and co-firing methods using carbon rods as a template. A dense electrolyte layer was obtained at a co-firing temperature of 1400°C, followed by cathode deposition and sintering. The prepared micro-tubular SOFCs were comprised of Ni-yttria-stabilized zirconia, Ni–scandia-stabilized zirconia (SSZ), SSZ, strontium-doped lanthanum manganite (LSM)-SSZ, and LSM as the anode support, anode functional layer, electrolyte, cathode functional layer, and cathode current collector, respectively. The developed dip-coating method is fast in turnaround time and enables fabricating the one closed-end tubes of various lengths and diameters by co-firing.

Overview of Approaches to Increase the Electrochemical Activity of Conventional Perovskite Air Electrodes

“…In general, these are mainly the low-temperature methods to maintain the high surface area of the nanosized materials. Among the variety of methods available to improve the conventional perovskite electrodes by extending the triple-phase boundary (TPB), it is worth mentioning spray pyrolysis in its different modifications highlighted in the review [273], and used for LSM in [218,219,[274][275][276][277], and for LSCF in [223,[278][279][280][281]; electrospinning represented in reviews [282][283][284], and used for LSM in [285,286], and for LSCF in [286][287][288][289][290][291][292] template method used for LSM in [293], and for LSCF in [294][295][296][297]; infiltration method considered in the reviews [298][299][300][301][302], and used for LSM in [26,54,148,154,232,[303][304][305][306][307]…”

Chemical Vapour Deposition of Scandia-Stabilised Zirconia Layers on Tubular Substrates at Low Temperatures

“…Considerably less information is available on the preparation of this electrolyte for tubular cells. Few papers [ 1 , 2 , 4 , 5 , 6 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ] demonstrate results of investigation on manufacturing of ScSZ electrolytes for tubular SOFC via “wet chemistry” methods, mainly dip-coating, where the final stage of this process is their sintering at temperatures of 1400–1500 °C. However, there is no information on attempts to obtain electrolytes on tubular substrates using CVD or MOCVD methods.…”