Effect of Anode Thickness on Polarization Resistance for Metal-Supported Microtubular Solid Oxide Fuel Cells

Sumi, Hiroyuki; Shimada, Hiroyuki; Yamaguchi, Yuki; Yamaguchi, Toshiaki

doi:10.1149/2.0431704jes

Cited by 17 publications

(7 citation statements)

References 58 publications

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“…To further understand the sensitivity of the oxygen electrode performance to infiltration sequence, DRT analysis was performed so that different electrode physical/chemical processes could be isolated in their corresponding frequency domain . The DRT method has been widely used for analyzing the performance of SOEC with Ni‐YSZ hydrogen electrode, and was also recently adopted for cells with Ni‐GDC or Ni‐YSZ‐GDC electrode with both metal‐supported and ceramic‐supported structures . An open‐source program “DRTTOOLS” with Tikhonov Regularization method is used here .…”

Section: Resultsmentioning

confidence: 99%

“…[86,87] The DRT method has been widely used for analyzing the performance of SOEC with Ni-YSZ hydrogen electrode, [88][89][90] and was also recently adopted for cells with Ni-GDC or Ni-YSZ-GDC electrode with both metal-supported and ceramic-supported structures. [56,58,[91][92][93] An open-source program "DRTTOOLS" with Tikhonov Regularization method is used here. [94,95] Unlike Bode or Nyquist plots where different processes overlap, at least four processes (i.e., four distinct peaks denoted as P 1 , P 2 , P 3 , and P 4 ) can be identified in the DRT plots, Figure 5.…”

Section: Enhanced Oer Catalysis With Alternating-infiltrated Compositmentioning

confidence: 99%

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Metal‐Supported Solid Oxide Electrolysis Cell with Significantly Enhanced Catalysis

et al. 2019

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High‐temperature electrolysis (HTE) using solid oxide electrolysis cells (SOECs) is a promising hydrogen production technology and has attracted substantial research attention over the last decade. While most studies are conducted on hydrogen electrode‐supported type cells, SOEC operation using metal‐supported cells has received minimal attention. The development of metal‐supported SOECs with performance similar to the best conventional SOECs is reported. These cells have stainless steel supports on both sides, 10Sc1CeSZ electrolyte and electrode backbones, and nano‐structured catalysts infiltrated on both hydrogen and oxygen electrode sides. Samarium‐doped ceria (SDC) mixed with Ni is infiltrated as a hydrogen electrode catalyst, and the effect of ceria:Ni ratio is studied. On the oxygen electrode side, catalysts including lanthanum strontium manganite (LSM), lanthanum strontium cobalt ferrite (LSCF), praseodymium oxide (Pr6O11), and their composite catalysts with SDC (i.e., LSM‐SDC, LSCF‐SDC, and Pr6O11‐SDC) are compared. Using the materials with highest catalytic activity (Pr6O11‐SDC and SDC40‐Ni60) and optimizing the catalyst infiltration processes, excellent electrolysis performance of metal‐supported cells is achieved. Current densities of −5.31, −4.09, −2.64, and −1.62 A cm−2 are achieved at 1.3 V and 50 vol% steam content at 800, 750, 700, and 650 °C, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Enhanced Oer Catalysis With Alternating-infiltrated Compositmentioning

confidence: 99%

Metal‐Supported Solid Oxide Electrolysis Cell with Significantly Enhanced Catalysis

et al. 2019

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“…Due to their elevated operating temperature, this type of cells offers rather wide fuel flexibility from hydrogen to hydrocarbon-based fuels or alcohols, thus making them compatible to the existing fuel infrastructure [1][2][3][4][5][6][7]. Owing to this fuel flexibility, SOCs can play important roles in future energy supply scenarios: (i) SOFCs for stationary electricity generation [4,8], (ii) metal-supported SOFCs for mobile applications [9][10][11][12][13], and (iii) SOECs for storage of excess electricity in the form of chemical bonds [2,[14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Model System Supported Impedance Simulation of Composite Electrodes

2019

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Current research on fuel electrodes of solid oxide cells (SOCs) is done either on model‐type pattern electrodes or by interpretation of impedance spectra measured on “real” porous paste electrodes. However, results obtained by both methods are not always straightforward to compare. To bridge this gap, in this study impedance spectra of 3D porous composite electrodes with a well‐defined geometry are simulated using elementary parameters from model‐type experiments. By independent variation of these elementary parameters, it is possible to analyze the influence of the individual elementary processes on the overall electrode performance without the issue of changing its microstructure, which usually occurs when changing materials in case of real porous electrodes. The obtained results identify the electrochemical reaction resistance as the parameter with the highest impact on the polarization resistance of porous electrodes. This study thus provides a basis for a knowledge‐based improvement of existing and novel composite fuel electrodes. In addition, the developed transmission line model is used for critically examining the common method of deconvolution of impedance data measured on real porous composite electrodes, which often relies on the assumption of elementary processes being represented by a serial connection of simple R||C elements.

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“…Note that the peak at ∼10 kHz is not considered here, as it may be an artefact of the limited measurement range. Numerous studies have employed DRT on SOCs [34,[49][50][51][52][53][54][55] and to a lesser extent, metal-supported SOCs [56][57][58][59][60] to deconvolute electrochemical processes. Based on this prior work and gas dilution testing, we hypothesize that the processes at 5-8 and 20-40 Hz and are ascribed to the air electrode, while the processes at 0.5-1, 200-300, and 2000-4000 Hz are ascribed to fuel electrode.…”

Section: Short-term Durability Testingmentioning

confidence: 99%

Solid oxide cell electrolytes deposited by atmospheric suspension plasma spraying at high velocity and high temperature

Kuhn

Kesler

2023

Fuel Cells

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Metal-supported solid oxide cells with Yttria-stabilized zirconia (YSZ) electrolytes fabricated by atmospheric plasma spraying are routinely found to have open-circuit voltages (OCVs) below the Nernst potential due to gas crossover and combustion resulting from electrolyte defects. To improve splat bonding and reduce coating defects, YSZ electrolytes were fabricated here at >800 • C substrate temperatures and torch-substrate relative velocities of 4 and 12 m/s by atmospheric suspension plasma spraying. Electrolyte microstructures appeared dense, with porosities estimated to be approximately 2.2-3.5 vol%. Minimal segmentation cracking was observed on samples fabricated at 12 m/s. The full cells that were electrochemically tested had permeabilities in the range of 4-6 × 10 −19 m 2 , and the maximum recorded OCV was ∼26 mV below the Nernst potential for 750 • C. Potential performance gains from YSZ deposition at substrate temperatures >800 • C may have been masked by poor substrate-fuel electrode contact. Using electrochemical impedance spectroscopy, it was found that the ohmic and polarization resistances decreased and increased, respectively, over time. The calculated distribution of relaxation times of the tested cells, together with observations from the literature, were employed to identify possible cell degradation mechanisms observed during short-term durability testing.

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Effect of Anode Thickness on Polarization Resistance for Metal-Supported Microtubular Solid Oxide Fuel Cells

Cited by 17 publications

References 58 publications

Metal‐Supported Solid Oxide Electrolysis Cell with Significantly Enhanced Catalysis

Metal‐Supported Solid Oxide Electrolysis Cell with Significantly Enhanced Catalysis

Model System Supported Impedance Simulation of Composite Electrodes

Solid oxide cell electrolytes deposited by atmospheric suspension plasma spraying at high velocity and high temperature

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