Structural Modification of Segmented-in-series Tubular SOFCs Using Performance Simulation and the Effect of (Sm, Ce)O2 Cathode Interlayer on the Generation Characteristics under Pressurization

Tomida, Kazuo; Nagao, Hidemi; Kabata, Tatsuo; Tsukuda, Hiroshi; Yamazaki, Yohtaro

doi:10.5796/electrochemistry.77.865

Cited by 16 publications

(5 citation statements)

References 32 publications

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“…Mitsubishi Heavy Industries, Ltd. has developed segmented-inseries tubular SOFC for over 20 years and is currently focusing on the improvement of the cell efficiency and reliability. 10,11 In this study, our objective is to identify the electrode processes of a practical Mitsubishi segmented-in-series tubular SOFC from its impedance spectra by combining the DRT analysis and complex nonlinear least square ͑CNLS͒ fitting. To validate the effectiveness of the above method, the ADIS transformed from the real part of recorded impedance spectrum has also been presented for comparison.…”

mentioning

confidence: 99%

Analysis of Impedance Spectra for Segmented-in-Series Tubular Solid Oxide Fuel Cells

Liu

Muroyama

Matsui

et al. 2010

J. Electrochem. Soc.

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113

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The individual electrode processes from anode and cathode have been clearly identified from practical impedance spectra with high-frequency inductive impedances for the Mitsubishi segmented-in-series tubular solid oxide fuel cell by combining the distribution of relaxation time analysis and the complex nonlinear least square fitting. Anodic gas diffusion process and charge transfer reaction near anodic triple phase boundary appear at ∼0.3 and 1000Hz , respectively. Cathodic oxygen reduction processes appear at ∼10Hz at 700°C , whereas the impedance arc over 10000Hz is dominated by the cathodic oxygen ion transfer through the (normalLa,normalSr)normalMnO3 (LSM)/ normalY2normalO3 -stabilized normalZrO2 (YSZ) interface and YSZ of the composite. The results also exhibit an excellent agreement with those from the analysis of difference in impedance spectra.

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confidence: 99%

Analysis of Impedance Spectra for Segmented-in-Series Tubular Solid Oxide Fuel Cells

Liu

Muroyama

Matsui

et al. 2010

J. Electrochem. Soc.

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113

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“…The cell fabrication procedures have been reported elsewhere. 17,18 Figure 1 shows the schematic diagram of the two-cell short stack employed in this study. Two serially-connected single cells with identical size and fabrication processes were numbered as cell 1 and cell 2.…”

Section: Methodsmentioning

confidence: 99%

Dynamic Behavior of Segmented-in-Series Tubular Solid Oxide Fuel Cell upon Discharge

Liu

Muroyama

Matsui

et al. 2012

J. Electrochem. Soc.

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Dynamic behavior of the segmented-in-series tubular solid oxide fuel cell upon discharge was investigated. The cell performance decreased initially at 900 • C, accompanied by the increase of ohmic resistance. Lower partial pressure of oxygen in the cathode resulted in a more severe decrease, whereas the gas displacement in the anode compartment did not induce such behavior. As the current was cut off, the ohmic resistance rapidly recovered toward the starting value before current load. The possible origin for this increase-recovery behavior of the ohmic resistance has been discussed based on the evaluation of oxygen partial pressure at the cathode/electrolyte interface and element interdiffusion between cathode and electrolyte.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 130.54.130.250 Downloaded on 2014-08-27 to IP Journal of The Electrochemical Society, 159 (3) B324-B330 (2012) B325 ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 130.54.130.250 Downloaded on 2014-08-27 to IP Journal of The Electrochemical Society, 159 (3) B324-B330 (2012) B327 0.22 A cm -2 0 A cm -2 ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 130.54.130.250 Downloaded on 2014-08-27 to IP

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“…For segmented-in-series tubular SOFCs, it has been reported that the theoretical voltage was obtained using a porous CSZ substrate with oxide ion conduction (1,21,22). The theoretical OCV of a H 2 (3% H 2 O)-air fuel cell at 900°C is 1.085 V. For a cell with a porous substrate (22), the electrical resistance of the single cell, including the interconnect, should theoretically be 0.42 Ω cm. When the area specific resistance of the substrate is ≥21 Ω cm, 99.9% of the theoretical voltage can be obtained.…”

Section: Sample Propertiesmentioning

confidence: 99%

Evaluation of Porous Ni-YSZ Cermets with Ni content of 0-30 vol% As Insulating Substrates for Solid Oxide Fuel Cells

2011

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Structural Modification of Segmented-in-series Tubular SOFCs Using Performance Simulation and the Effect of (Sm, Ce)O2 Cathode Interlayer on the Generation Characteristics under Pressurization

Cited by 16 publications

References 32 publications

Analysis of Impedance Spectra for Segmented-in-Series Tubular Solid Oxide Fuel Cells

Analysis of Impedance Spectra for Segmented-in-Series Tubular Solid Oxide Fuel Cells

Dynamic Behavior of Segmented-in-Series Tubular Solid Oxide Fuel Cell upon Discharge

Evaluation of Porous Ni-YSZ Cermets with Ni content of 0-30 vol% As Insulating Substrates for Solid Oxide Fuel Cells

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