Degradation Studies on Tubular Metal Supported SOFC

Rodrı́guez-Martı́nez, Lide M.; Otaegi, Laida; Alvarez, Mario; Rivas, Mikel; Gómez, Nuria; Zabala, Aingeru; Arizmendiarrieta, Nagore; Antepara, Íñigo; Urriolabeitia, Abel; Olave, Mireia; Villarreal, I.; Laresgoiti, Ander

doi:10.1149/1.3205591

Cited by 20 publications

(9 citation statements)

References 3 publications

(6 reference statements)

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“…respectively (see Figure 4). The thermal cycling tolerance of MS-SOFC observed here is consistent with previous reports, although the number of cycles, heating rate, and temperature range used here is among the most aggressive to date [8,11,26,27]. Figure 3, the cell survived with minimal impact to the performance or sealing.…”

Section: Further Information On the Selection Of This Glass Seal Matesupporting

confidence: 90%

Durability of symmetric-structured metal-supported solid oxide fuel cells

Tucker

2017

Journal of Power Sources

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Symmetric-structure metal-supported solid oxide fuel cells (MS-SOFC) with YSZ electrolyte are fabricated with porous YSZ backbone electrodes, stainless steel supports, and infiltrated catalysts on both anode and cathode side. Durability towards aggressive thermal and redox cycling, and long-term operation is assessed. Many sealing material candidates are screened for compatibility with the cell materials and operating conditions, and a commercial sealing glass, GM31107, is selected. LSM/SDCN cells are then subjected to 200 very fast thermal cycles and 20 complete redox cycles, with minimal impact to cell performance. LSM/SDCN and SDCN/SDCN cells are operated for more than 1200 h at 700°C. The seal and cell hermeticity is maintained, and cell ohmic impedance does not change significantly during operation. Electrode polarization increases during operation, leading to significant degradation of the cell performance. In-operando EIS and post-mortem SEM/EDS analysis suggest that catalyst coarsening and cathode Cr deposition are the dominant degradation modes.

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Section: Further Information On the Selection Of This Glass Seal Matesupporting

confidence: 90%

Durability of symmetric-structured metal-supported solid oxide fuel cells

Tucker

2017

Journal of Power Sources

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“…[14][15][16][17][18][19] However, the metal-supported designs also suffer from the issues of cathode poison induced by inter-diffusion of metal component and mechanical property degradation of metal substrate at high temperatures. 9,20 Recently, yttria-stabilized zirconia (YSZ) was used as anode substrate to improve structural reliability of SOFCs. [21][22][23][24] It is noteworthy that anode electrode accounts for more than 90% materials used by the cell in anode-supported SOFCs.…”

mentioning

confidence: 99%

Fabrication and Characterization of High Performance Intermediate Temperature Alumina Substrate Supported Micro-Tubular SOFCs

Ren¹,

Gan²,

Yang³

et al. 2017

J. Electrochem. Soc.

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The central challenge of solid oxide fuel cell (SOFC) technology lies in how to achieve sufficient robustness and reliability while significantly reducing system and operating cost. This paper studied a novel alumina substrate supported micro-tubular SOFC with high performance at intermediate temperatures. An in-house built extrusion system in combination with modified phase-inversion method was used to fabricate micro-tubular alumina substrate with radially well-aligned micro-channel array. The gas permeability of such an alumina substrate reached 69.2 × 10 5 Lm −2 h −1 , approximately ten times that of the substrate with conventional microstructures. The addition of NiO (10 wt%) sintering aid significantly improved the bending strength of α-Al 2 O 3 substrate while forming NiAl 2 O 4 spinel phase in the substrate. Built upon the fabrication of alumina substrate, anode electrode and electrolyte layers were fabricated through dip-coating and sintering process alternatively. A porous barrier layer strategy was employed to inhibit NiO in the anode layer from diffusing into the substrate during high temperature sintering process. The resulting dense electrolyte layer and anode functional layer with the thickness of ∼10 μm and ∼20 μm were obtained respectively. The alumina substrate supported micro-tubular SOFC with material system NiO-SDC/SDC/PrBaCo 2 O 5+δ demonstrated the peak power density of ∼1420 mW cm −2 at 600 • C, which is among the best performance of SOFCs with the same material system in open literature. The novel micro-tubular cell also demonstrated excellent thermal cycling stability. By replacing the high-cost rare-earth anode material with low-cost alumina, the novel design not only significantly reduced the cost but also improved the robustness and reliability of SOFCs.

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“…MS-SOFCs with a novel composite anode were cycled 100 times with 45°C min -1 heating rate [8]. Tubular MS-SOFCs have been thermal cycled 250 times at 10°C min -1 [9], and 5 times at 350°C min -1 maximum rate [10]. Thermal cycling is typically performed over a temperature range from near room temperature to the operating temperature, with the cell held at open circuit (no power generated) during temperature ramps.…”

Section: Introductionmentioning

confidence: 99%

Dynamic-temperature operation of metal-supported solid oxide fuel cells

Tucker

2018

Journal of Power Sources

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A dynamic-temperature operation strategy is proposed for SOFC systems, in which the cell temperature varies rapidly to match the SOFC stack power output to a dynamic load requirement. It is anticipated that this operation strategy may have benefits for system efficiency, size, and cost for applications with dynamic power load. Metal-supported SOFCs (MS-SOFCs) are operated continuously at 0.7 V while the temperature is varied rapidly between 675 and 800°C or 670 and 720°C. During the initial thermal excursion, the current density increases from 0.82 to 1.95 A cm-2 in 6.6 min for 675 to 800°C, and from 1.0 to 1.63 A cm-2 in 5.4 min for 670 to 720°C. Cells are subjected to continuous dynamic temperature operation for more than 100 cycles. Metal-supported; SOFC; dynamic temperature; thermal cycling

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Degradation Studies on Tubular Metal Supported SOFC

Cited by 20 publications

References 3 publications

Durability of symmetric-structured metal-supported solid oxide fuel cells

Durability of symmetric-structured metal-supported solid oxide fuel cells

Fabrication and Characterization of High Performance Intermediate Temperature Alumina Substrate Supported Micro-Tubular SOFCs

Dynamic-temperature operation of metal-supported solid oxide fuel cells

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