Accelerated degradation of 8.5mol% Y2O3-doped zirconia by dissolved Ni

Butz, Benjamin; Lefarth, Andreas; Störmer, Heike; Utz, Annika; Ivers-Tiffée, Ellen; Gerthsen, D.

doi:10.1016/j.ssi.2012.02.023

Cited by 22 publications

(27 citation statements)

References 23 publications

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“…According to Argirusis et al, the diffusion coefficient of Ni into single crystalline YSZ (as obtained from secondary ion mass spectroscopy) is about 8.5 × 10 −11 cm 2 /s at 1450 • C [20]. The diffusion distance (l = √ Dt, D: diffusion coefficient, t: time) is roughly estimated to be about 17 m. It has been also reported that the Ni diffusion depth into YSZ is about 100 m from the NiO/8YSZ interface when the sample is sintered at 1400 • C for 10 h [17]. Since Ni diffuses from both sides of the film, it is reasonable to assume that Ni diffuses from the NiO plates into the entirety of the ceria-doped ScSZ.…”

Section: Methodsmentioning

confidence: 98%

“…The conductivity degradation of NiOdoped yttria-stabilized zirconia (YSZ) has been widely investigated. The degradation of NiO-doped YSZ is reported to be accelerated under reductive conditions and the conductivity decrease is attributed to the cubic to tetragonal phase transition [15][16][17]. So far, however, very little attention has been paid to the effect of Ni on the conductivity of ScSZ [18,19] and to the best of our knowledge, the effects of Ni diffusion on the conductivity of ScSZ film during sintering process under reductive conditions are yet to be reported.…”

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Effects of Ni diffusion on the accelerated conductivity degradation of scandia-stabilized zirconia films under a reducing atmosphere

Yun

Kwon

Kim

et al. 2016

Journal of the European Ceramic Society

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Section: Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Effects of Ni diffusion on the accelerated conductivity degradation of scandia-stabilized zirconia films under a reducing atmosphere

Yun

Kwon

Kim

et al. 2016

Journal of the European Ceramic Society

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“…1 Butz et al 31 have reported that Ni can diffuse quickly at commonly applied sintering temperatures into 8 mol% Y 2 O 3 -Zirconia phase. During the reduction of NiO to metallic Ni, which has a much lower solubility in YSZ, the excess Ni can be exsolved from YSZ and accelerates the appearance of fine tetragonal phase.…”

Section: Discussionmentioning

confidence: 99%

Quantitative Study on the Correlation between Solid Oxide Fuel Cell Ni-YSZ Composite Anode Performance and Reduction Temperature Based on Three-Dimensional Reconstruction

Jiao

Shikazono

2015

J. Electrochem. Soc.

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The effects of reduction temperature on the initial performances and short-time durability of nickel-yttria-stabilized zirconia composite solid oxide fuel cell anodes were investigated. The anode microstructures before and after 100 hours operation were quantitatively analyzed by three-dimensional reconstruction based on focused ion beam-scanning electron microscopy technique. The anode reduced at 500 • C showed the worst initial performance and stability in operation which was attributed to the smallest specific nickel-yttria-stabilized-zirconia interface area and the very porous nickel formed in low temperature reduction. The anode reduced at 800 • C showed the smallest polarization resistance which was attributed to the largest active three phase boundary density. The anode reduced at 1000 • C showed the most stable performance with polarization resistance enhanced in operation, which was attributed to the largest specific nickel-yttria-stabilized-zirconia interface area and the dense nickel phase formed in high temperature reduction. It is found that the performance of anode is determined not only by the active three phase boundary density but also the interface bonding between nickel and yttria-stabilized-zirconia in composite anode. Nickel-yttria-stabilized-zirconia interfacial bonding can be enhanced with the increase of reduction temperature, which is able to inhibit the nickel sintering and improve the anode performance stability in long-time operation. Solid oxide fuel cell (SOFC, hereafter), as a high efficiency and fuel flexibility energy conversion device, has been attracting more and more attentions in recent decades, 1,2 while long time operation stability of SOFC electrodes remain as one of the main challenges. For the nickel-yttria-stabilized-zirconia (Ni-YSZ, hereafter) anodes, major anode degradation mechanism is attributed to the agglomeration of Ni phase, especially during the initial operation period (<200 hours). It has been reported that this initial agglomeration is associated with the initial fast sintering kinetics of Ni. [3][4][5][6][7][8][9][10][11][12] Ni sintering results in the reduction of active three phase boundary (TPB, hereafter) density and Ni network connectivity.The sintering mechanism depend on many process factors, such as, sintering temperature, fuel humidity and contaminants. [13][14][15][16] A few investigations were conducted to investigate the influence of reduction temperature on the pure initial Ni particle microstructure. Plascencia and Utigard 17 and Utigard et al. 18 have studied the reduction process of NiO particles at different temperatures. It is shown that different initial reduction temperatures lead to totally different morphologies of Ni particles in millimeter-scale. Thus, for conventional composite anode, the corresponding initial performance and durability can be also influenced by the Ni morphological differences created during the reduction process. Several researchers have reported on the influence of reduction temperature on the initial Ni-YSZ mi...

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“…The parameterization of this model was supported by combining (i) microstructural parameters evaluated by means of FIB/SEM-tomography, 61) (ii) the line specific resistance of the triple phase boundary (TPB) determined by electrochemical impedance spectroscopy (EIS) on patterned model anodes, 62) (iii) the conductivity of the YSZ-matrix including the impact of NiO interdiffusion 63), 64) and (iv) the DRT as an additional quality criterion in the fitting procedure. 48) Please note, without considering the above mentioned parameters, a fitting of the spectra with even lower error levels would be possible.…”

Section: )mentioning

confidence: 99%

Evaluation of electrochemical impedance spectra by the distribution of relaxation times

Ivers‐Tiffée

Weber

2017

J. Ceram. Soc. Japan

244

109

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Electrochemical impedance spectroscopy is a well suited method for studying the properties of electrochemical systems. In recent decades electrochemical systems were investigated at different scales, from small model electrodes to high power devices, such as fuel cells and batteries. In the latter case, the measurement of reliable spectra and their evaluation is challenging because (i) the impedance is usually very low (1 ³), (ii) there is more than one rate limiting, electrochemical process per electrode, (iii) their charge transfer and transport processes are coupled and (iv) cathodic and anodic contributions overlap in the frequency domain. The Distribution of Relaxation Times (DRT) is supportive when deconvoluting complex impedance spectra, and has therefore gained increased attention. In this paper we introduce selected results of advanced impedance analysis. We discuss the impact of impedance data quality, statistically distributed noise and single errors in the spectra. Furthermore, the applicability of DRT for establishing adequate equivalent circuit models for ceramic electrochemical devices, such as batteries and fuel cells will be discussed.

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Accelerated degradation of 8.5mol% Y2O3-doped zirconia by dissolved Ni

Cited by 22 publications

References 23 publications

Effects of Ni diffusion on the accelerated conductivity degradation of scandia-stabilized zirconia films under a reducing atmosphere

Effects of Ni diffusion on the accelerated conductivity degradation of scandia-stabilized zirconia films under a reducing atmosphere

Quantitative Study on the Correlation between Solid Oxide Fuel Cell Ni-YSZ Composite Anode Performance and Reduction Temperature Based on Three-Dimensional Reconstruction

Evaluation of electrochemical impedance spectra by the distribution of relaxation times

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