Nickel coarsening in annealed Ni/8YSZ anode substrates for solid oxide fuel cells

Simwonis, D.

doi:10.1016/s0167-2738(00)00650-0

Cited by 473 publications

(327 citation statements)

References 18 publications

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“…The conductivity of a Ni-YSZ composite is known to degrade with time under operation at high temperature due to the growth of Ni grains, whereas the ceramic backbone remains largely unaltered. 1,2 The sintering of the Ni network may result in performance degradation through loss of electrical conductivity of the anode support ͑current collection͒. It is known from catalysis with nanosized Ni on ceramic beds that both temperature and humidity ͑the H 2 O/H 2 ratio͒ enhance Ni particle growth; the effect of steam arises from the formation and mobility of the Ni 2 -OH species.…”

mentioning

confidence: 99%

Dimensional Behavior of Ni–YSZ Composites during Redox Cycling

Pihlatie

Kaiser

Larsen

et al. 2009

J. Electrochem. Soc.

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The dimensional behavior of Ni–yttria-stabilized zirconia (YSZ) cermets during redox cycling was tested in dilatometry within the temperature range 600–1000°C . The effect of humidity on redox stability was investigated at intermediate and low temperatures. We show that both the sintering of nickel depending on temperature of the initial reduction and the operating conditions, and the temperature of reoxidation are very important for the size of the dimensional change. Cumulative redox strain (CRS) is shown to be correlated with temperature. Measured maximum CRS after three redox cycles varies within 0.25–3.2% dL/L in dry gas and respective temperature range of 600–1000°C . A high degree of redox reversibility was reached at low temperature, however, reversibility is lost at elevated temperatures. We found that at 850°C , 6% steam and a very high pnormalH2O∕pnormalH2 ratio is detrimental for redox stability, whereas at 600°C no negative effect was observed. Pre-reduction at 1100 instead of 800°C more than doubled redox strain on reoxidation at 800°C . For samples similarly pre-reduced at 1000°C , lowering the reoxidation temperature from 1000to750°C or below reduces the redox strain to less than half.

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confidence: 99%

Dimensional Behavior of Ni–YSZ Composites during Redox Cycling

Pihlatie

Kaiser

Larsen

et al. 2009

J. Electrochem. Soc.

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“…Both processes utilized in-house image processing programs and commercially available software (Avizo, FEI, Bordeaux, France). The average particle/pore sizes were quantified with the mean-intercept method (MIL) [31]. A more detailed description of the procedure used for imaging, image processing and quantification can be found elsewhere [11,17,24].…”

Section: D Imaging and Reconstructionmentioning

confidence: 99%

Towards the 3D Modelling of the Effective Conductivity of Solid Oxide Fuel Cell Electrodes – Validation against experimental measurements and prediction of electrochemical performance

Rhazaoui

Cai

Kishimoto

et al. 2015

Electrochimica Acta

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“…To assure the reliability of the analysis, we generated 150 independent parallel lines with 0.2um line spacing for each digital image. The following equations 7,8,10) are used to calculate the contiguity between the same phases in a two phase (α, β) composite:…”

Section: Quantification Of Microstructurementioning

confidence: 99%

Quantitative Microstructure Analysis to Predict Electrical Property of NiO-YSZ Anode Support for SOFCs

Wahyudi¹,

Ahmed²,

Lee³

et al. 2013

Transactions of the Korean hydrogen and new energy society

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>> The correlation between NiO-YSZ microstructure and its electrical property used for SOFC anode was critically evaluated with image processing and direct measurement techniques. These innovative processing techniques were employed to quantify the contiguity of the anode constituent phase. The calculated contiguities were then correlated with electrical conductivity attained from 4-probe DC method. This investigation described that contiguity of nickel oxide phases of an anode has a linear relationship with its electrical conductivity. We observed that the contiguity of NiO increased from 0.18 to 0.50 then electrical conductivity attained was significantly increased from 520 S/cm to 1468 S/cm at 900°C.

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Nickel coarsening in annealed Ni/8YSZ anode substrates for solid oxide fuel cells

Cited by 473 publications

References 18 publications

Dimensional Behavior of Ni–YSZ Composites during Redox Cycling

Dimensional Behavior of Ni–YSZ Composites during Redox Cycling

Towards the 3D Modelling of the Effective Conductivity of Solid Oxide Fuel Cell Electrodes – Validation against experimental measurements and prediction of electrochemical performance

Quantitative Microstructure Analysis to Predict Electrical Property of NiO-YSZ Anode Support for SOFCs

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