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Schichlein, H.; Müller, Axel; Voigts, M.; Krügel, Albert; Ivers-Tiffée, Ellen

doi:10.1023/a:1020599525160

Cited by 641 publications

(374 citation statements)

References 18 publications

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“…arc at 0.5 Hz, as shown in Fig. 6d, is associated with slower adsorption/desorption of oxygen on the electrode surface, 16,17 which is in agreement with an order of magnitude higher surface exchange coefficient for PNO (e.g. 2 × 10 −6 cm s −1 vs. 4 × 10 −7 cm s −1 in NNO at 750…”

Section: Resultssupporting

confidence: 77%

Activity and Stability of (Pr_1-xNd_x)₂NiO₄as Cathodes for Solid Oxide Fuel Cells

Dogdibegovic

Guan

Yan

et al. 2016

J. Electrochem. Soc.

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Single phase (Pr 1-x Nd x ) 2 NiO 4 cathode powders (x = 0, 0.25, 0.50, 0.75, and 1.0) were synthesized via a glycine-nitrate combustion and high temperature calcination. Anode supported cells were used to investigate the cathode property. A reproducible performance, within 9% for each cathode composition, was observed providing a wealth of data for quantitative studies. Area specific resistance analysis and i-V measurements between 650 and 850 • C showed a decrease in the cell performance with increasing Nd content. Impedance spectrum analysis suggests that the decline in performance results from an increase in electrode polarization. While Pr 2 NiO 4 cells showed significant performance degradation of 6.40%/1,000 hours, the degradation rate for (Pr 0.75 Nd 0.25 ) 2 NiO 4 cells was reduced by an order of magnitude (0.56%/1,000 hours) with a 7% lower power output. Likewise, the cathodes with a higher Nd content showed further improvement in performance stability with a marginal degradation rate of 0.06%/1,000 hours. During the past few years, praseodymium nickelate (Pr 2 NiO 4+δ , PNO) has attracted increasing attention as the cathode for solid oxide fuel cells (SOFCs) because of its unique properties over a wide temperature range, 1-5 including: (1) a high oxygen diffusion coefficient (e.g.(3) a low polarization resistance in a single cell, (4) a large oxygen overstoichiometry (δ as much as 0.22 at room temperature), 6 and (5) the ability to accept various substituents with similar ionic radii and valance at Pr and/or Ni sites.2 Moreover, its coefficient of thermal expansion (13.2 × 10 −6 K −1 ) 4,7 is compatible to doped ceria (13 × 10 −6 K −1 ) 7 and yttria-stabilized zirconia (11 × 10 −6 K −1 ) 7 electrolytes. The electrochemical performance of PNO, however, did show an appreciative degradation 4 which likely resulted from its readily occurring phase transitions at operating conditions. 8 PNO partially decomposes to praseodymium oxide (PrO x ) and a higher order layered structure (Pr 3 Ni 2 O 7 ) during operation, 8 which presents a concern because of possible structural collapse and longterm performance degradation. 4,8 Current approaches to stabilize the PNO phase focus on substituting A and/or B-site ions.9,10 Both La 2 NiO 4 and Nd 2 NiO 4 (NNO) are more stable than PNO, 11 but have lower power density.12 This work reports an attempt to stabilize the long-term cell performance in praseodymium nickelate. (Pr 1-x Nd x ) 2 NiO 4 (PNNO, x = 0, 0.25, 0.50, 0.75, and 1.0) cathodes were synthesized and electrochemically evaluated in anode supported cells. Nd was chosen as an A-site substituent due to its similar physical properties to Pr and its ability to suppress the formation of PrO x and higher order phases. The i-V and electrochemical impedance spectroscopy (EIS) measurements were performed between 650-850• C, while the performance stability was measured at 750• C and 0.8 V for 500 hours. ExperimentalStarting materials, Pr(NO 3 ) 3 , Nd(NO 3 ) 3 , and Ni(NO 3 ) 2 (99.9% REO, Alfa Aesar, Haverhill, MA) were...

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Section: Resultssupporting

confidence: 77%

Activity and Stability of (Pr_1-xNd_x)₂NiO₄as Cathodes for Solid Oxide Fuel Cells

Dogdibegovic

Guan

Yan

et al. 2016

J. Electrochem. Soc.

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“…Furthermore, plots of distribution of relaxation times (DRT) are provided. The DRT plots are used to illustrate development of impedance over time and to highlight frequency ranges for different processes contributing to the total impedance response from the cells [25,26]. To enable a quantitative analysis of the IS complex-non-linear-least-squares (CNLS) method was used to fit an equivalent circuit model to the data.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

Ni/YSZ electrodes structures optimized for increased electrolysis performance and durability

et al. 2016

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Cermet Ni/YSZ electrodes are the most commonly applied fuel electrode for solid oxide cells (SOC) both when targeting solid oxide fuel cell (SOFC) applications and when used as solid oxide electrolysis cell (SOEC). In this work we report on the correlation between initial Ni/YSZ microstructure and the resulting electrochemical performance both initially and during long-term electrolysis testing at high current density and high p(H2O) inlet. Especially, this work focuses on microstructure optimization to hinder Ni mobility and migration during long-term operation and illustrates the key-role of electrode over-potential on the degradation of the Ni/YSZ electrodes in SOEC. We find that for long-term stability for electrolysis at high current densities and high p(H2O) the as-produced NiO/YSZ precursor electrode should be: 1) As dense as possible, 2) as fine particle and pore sized as possible and 3) the three phases (Ni, YSZ and pore phase) shall be size-matched and welldispersed. Applying such microstructure optimized Ni/YSZ electrode we show SOEC test results with long-term degradation rate as low as 0.3-0.4 %/kh at 1 A/cm 2 , 800 C and inlet gas mixture of p(H2O)/p(H2):90/10. This enables SOEC operation of such cell for more than 5 years below thermo-neutral potential at these operating conditions.

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“…The distribution of relaxation times (DRT) analysis was performed using in-house software based on Schichlein et al [17]. The visual Hanning filter was used for data filtering and the filtering values was kept fixed for all analyses.…”

Section: Cell Electrochemical Characterizationmentioning

confidence: 99%

Effect of infiltration material on a LSM15/CGO10 electrochemical reactor in the electrochemical oxidation of propene

Ippolito

2012

J Solid State Electrochem

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Untitled

Cited by 641 publications

References 18 publications

Activity and Stability of (Pr_1-xNd_x)₂NiO₄as Cathodes for Solid Oxide Fuel Cells

Activity and Stability of (Pr_1-xNd_x)₂NiO₄as Cathodes for Solid Oxide Fuel Cells

Ni/YSZ electrodes structures optimized for increased electrolysis performance and durability

Effect of infiltration material on a LSM15/CGO10 electrochemical reactor in the electrochemical oxidation of propene

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Untitled

Cited by 641 publications

References 18 publications

Activity and Stability of (Pr1-xNdx)2NiO4as Cathodes for Solid Oxide Fuel Cells

Activity and Stability of (Pr1-xNdx)2NiO4as Cathodes for Solid Oxide Fuel Cells

Ni/YSZ electrodes structures optimized for increased electrolysis performance and durability

Effect of infiltration material on a LSM15/CGO10 electrochemical reactor in the electrochemical oxidation of propene

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Activity and Stability of (Pr_1-xNd_x)₂NiO₄as Cathodes for Solid Oxide Fuel Cells

Activity and Stability of (Pr_1-xNd_x)₂NiO₄as Cathodes for Solid Oxide Fuel Cells