Fabrication of tubular solid oxide fuel cells by solvent‐assisted lamination and co‐firing a rolled multilayer tape cast

2021

ECS Trans.

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.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2021

ECS Trans.

“…The manufacturing of planar cells is inexpensive because they can be prepared by simple and potentially low-cost fabrication processes such as tape-casting and screen printing (7). Various methods have been used to manufacture tubular SOFC supports, including iso-pressing (11), extrusion (7,12), plasma spaying (9), sequential dip-coating (13,14), slip-casting (15), freeze-casting (16,17), and tape-casting (18,19).…”

Section: Introductionmentioning

confidence: 99%

Tubular Solid Oxide Fuel Cells Fabricated by Tape-Casting and Dip-Coating Methods

2019

ECS Trans.

Tubular anode-supported solid oxide fuel cells (SOFCs) generate lower current densities than the planar SOFCs, but they have several advantages such as ease of sealing, high durability, and thermal-cycling stability. In this study, tubular anode supported SOFCs were fabricated by coupling the tape-casting and dip-coating methods. An anode support tape-cast was rolled into tubular shape over a mandrel. The seam joined to form a tube by solvent-assisted lamination at room temperature. The sample was pre-sintered at 900 °C, followed by dip-coating and co-sintering of the electrolyte at 1400 °C. The cathode layers were dip-coated onto the electrolyte and sintered at 1150 °C. The electrochemical performance of the prepared tubular SOFC was evaluated in N2/H2 gas at 650–800 °C. The cell exhibited a maximum power density of 281 mW cm-2 at 800 °C. The results confirmed that using simple low-cost methods including tape-casting, solvent-assisted lamination and dip-coating has the potential for the mass production of tubular SOFCs.

“…For the production of electrode-supported SOFCs, the electrolyte is usually co-sintered with the support electrode at temperatures ≥ 1400 ℃ to get a fully densified microstructure [7][8][9]. Owing to the fact that sintering temperature of SOFC electrodes is only between 1150 and 1250 ℃, decreasing the electrolyte sintering temperature to this range would result in lower sintering costs and shorter production cycle time.…”

Section: Introduction mentioning

confidence: 99%

Densification behavior of yttria-stabilized zirconia powders for solid oxide fuel cell electrolytes

Panthi

2018

J Adv Ceram

Self Cite

Yttria-stabilized zirconia (YSZ) is the most common electrolyte material for solid oxide fuel cells. Herein, we conducted a comparative study on the densification behavior of three different kinds of commercial 8 mol% YSZ powders: (i) TZ-8Y (Tosoh, Japan), (ii) MELox 8Y (MEL Chemicals, UK), and (iii) YSZ-HT (Huatsing Power, China). The comparison was made on both the selfsupporting pellets and thin-film electrolytes coated onto a NiO-YSZ anode support. For the pellets, MELox 8Y showed the highest densification at lower sintering temperatures with 93% and 96% of the theoretical density at 1250 and 1300 ℃, respectively. Although YSZ-HT showed a higher sintering rate than TZ-8Y, a sintering temperature of 1350 ℃ was required for both the powders to reach 95% of the theoretical density. For the thin-film electrolytes, on the other hand, YSZ-HT showed the highest sintering rate with a dense microstructure at a co-sintering temperature of 1250 ℃. Our results indicate that besides the average particle size, other factors such as particle size distribution and post-processing play a significant role in determining the sintering rate and densification behavior of the YSZ powders. Additionally, a close match in the sintering shrinkage of the electrolyte and anode support is important for facilitating the densification of the thin-film electrolytes.