Redox Durability of Ni-Co Alloy Cermet Anodes for SOFCs

Matsumoto, Kenichi; Tachikawa, Yuya; Matsuda, Junko; Taniguchi, Shunsuke; Sasaki, Kazunari

doi:10.1149/10301.1549ecst

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…Dissolved Co atoms in the alloy can act as scattering sites against electronic conduction in the Ni-based grains, so it is probable that increasing the Co content leads to a decrease in electrical conductivity. Moreover, a decrease in active Ni catalyst surface area on the Ni-Co alloy could also explain this result (10). The two types of pure Ni-GDC exhibited almost identical cell performance.…”

Section: Cell Testmentioning

confidence: 88%

Ni-Alloy Fuel Electrodes for Reversible Solid Oxide Cells

Yamada¹,

Tachikawa²,

Lyth³

et al. 2022

ECS Trans.

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Reversible solid oxide cells (r-SOCs) are devices that can operate efficiently in both fuel cell and electrolysis operation modes. Nickel is widely used as an anode in conventional solid oxide fuel cells (SOFCs), but this agglomerates due to redox cycling, leading to irreversible performance degradation, making it unsuitable for r-SOCs. Here, we apply alternative electrodes to r-SOCs, in which Ni-Co alloy functions as a catalyst and an electronic conductor, whilst Ce0.9Gd0.1O2 (GDC) functions as a mixed ionic-electronic conductor. The electrochemical performance of these Ni-Co-GDC electrodes and their reverse-operation durability in r-SOCs are evaluated, and the effect of varying the amount of Co is investigated, compared with conventional cermet fuel electrodes. These novel materials exhibit high electrochemical performance and durability against SOFC/SOEC reverse-operation cycling.

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Section: Cell Testmentioning

confidence: 88%

Ni-Alloy Fuel Electrodes for Reversible Solid Oxide Cells

Yamada¹,

Tachikawa²,

Lyth³

et al. 2022

ECS Trans.

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Analysis of solid oxide fuel and electrolysis cells operated in a real-system environment: State-of-the-health diagnostic, failure modes, degradation mitigation and performance regeneration

Subotić

Hochenauer

2022

Progress in Energy and Combustion Science

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Redox Stability Optimization in Anode-Supported Solid Oxide Fuel Cells

Wang,

Song

2024

Materials

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For Ni-YSZ anode-supported solid oxide fuel cells (SOFCs), the main drawback is that they are susceptible to reducing and oxidizing atmosphere changes because of the Ni/NiO volume variation. The anode expansion upon oxidation can cause significant stresses in the cell, eventually leading to failure. In order to improve the redox stability, an analytical model is developed to study the effect of anode structure on redox stability. Compared with the SOFC without AFL, the tensile stresses in the electrolyte and cathode of SOFC with an anode functional layer (AFL) after anode oxidation are increased by 27.07% and 20.77%, respectively. The thickness of the anode structure has a great influence on the structure’s stability. Therefore, the influence of anode thickness and AFL thickness on the stress in these two structures after oxidation is also discussed. The thickness of the anode substrate plays a more important role in the SOFC without AFL than in the SOFC with AFL. By increasing the thickness of the anode substrate, the stresses in the electrolyte and cathode decrease. This method provides a theoretical basis for the design of a reliable SOFC in the redox condition and will be more reliable with more experimental proofs in the future.

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Redox Durability of Ni-Co Alloy Cermet Anodes for SOFCs

Cited by 3 publications

References 2 publications

Ni-Alloy Fuel Electrodes for Reversible Solid Oxide Cells

Ni-Alloy Fuel Electrodes for Reversible Solid Oxide Cells

Analysis of solid oxide fuel and electrolysis cells operated in a real-system environment: State-of-the-health diagnostic, failure modes, degradation mitigation and performance regeneration

Redox Stability Optimization in Anode-Supported Solid Oxide Fuel Cells

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