Microstructure and reactivity effects on the performance of Nd2NiO4+δ oxygen electrode on Ce0.9Gd0.1O1.95 electrolyte

Montenegro-Hernández, Alejandra; Mogni, L.; Caneiro, A.

doi:10.1016/j.ijhydene.2012.09.071

Cited by 26 publications

(33 citation statements)

References 48 publications

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“…4) the presence of chemical reactivity is less evident that for the LNO cathode. This observation was also supported by EIS measurements, which detected slower electrochemical degradation in NNO cathodes operated at 700 ºC as compared with the observed for LNO cathodes [11,12]. Again, TEM and STEM on the FIB foils helped to find the predicted degradation zone.…”

Section: Case 1: Interphases Showing Chemical Reactivitysupporting

confidence: 70%

Review on Ceramic Interphases by Transmission and Scanning Electron Microscopy

Soldati

Montenegro-Hernández

Baqué

et al. 2014

Practical Metallography

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The Focused Ion Beam (FIB) technique was used to prepare site-specific samples from interfacial regions of different solid oxide fuel cells assemblies. Transmission and Scanning Electron Microscopy on the FIB foils combined with Electrochemical Impedance Spectroscopy (EIS) allowed the characterization of the electrode/electrolyte interphases and the determination of its influence on the cell performance after longterm operation conditions. This work reviews two cases: on one hand, Ln 2 NiO 4+δ (Ln= La, Nd) cathodes deposited on both Y 0.08 Zr 0.92 O 1.96 and Ce 0.9 Gd 0.1 O 1.95 electrolytes, that react at 900 °C during the adhesion treatment and at temperatures higher than 650 °C during the EIS measurements. These samples present a reaction layer of 10 nm thickness, which contains elements of both phases and was found responsible of the cell performance degradation. On the other hand, La 0.4 Sr 0.6 Co 0.8 Fe 0.2 O 3-δ cathodes showed excelent performance on Ceria electrolytes, even after 1000 hours at operation conditions. In that case, the microscopic analyses of FIB foils showed a semi-coherent interphase growth.

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Section: Case 1: Interphases Showing Chemical Reactivitysupporting

confidence: 70%

Review on Ceramic Interphases by Transmission and Scanning Electron Microscopy

Soldati

Montenegro-Hernández

Baqué

et al. 2014

Practical Metallography

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“…No secondary phases were observed by powder X-ray diffraction (XRD 12 No evidence of any chemical reaction was detected through XRD measurements of a NNO-LSGM powder mixture that had been heated at 1000…”

Section: Methodsmentioning

confidence: 99%

Determination of Electrode Oxygen Transport Kinetics Using Electrochemical Impedance Spectroscopy Combined with Three-Dimensional Microstructure Measurement: Application to Nd₂NiO_4+δ

Yakal-Kremski

Mogni

Montenegro-Hernández

et al. 2014

J. Electrochem. Soc.

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Oxygen reduction kinetic parameters -oxygen ion diffusion D δ , molar surface exchange rate O and surface exchange coefficient k -were determined for porous Nd 2 NiO 4+δ solid oxide fuel cell cathodes as a function of temperature and oxygen partial pressure by analyzing electrochemical impedance spectroscopy data using the Adler-Lane-Steele model. Electrode microstructural data used in the model calculations were obtained by three-dimensional focused ion beam-scanning electron microscope tomography. Cathodes were fabricated using Nd 2 NiO 4+δ powder derived from a sol-gel method and were tested as symmetrical cells with LSGM electrolytes. The oxygen surface exchange rate exhibited a power-law dependency with oxygen partial pressure, whereas the oxygen diffusivity values obtained varied only slightly. The present analysis suggests that the O-interstitial diffusion has a bulk transport path, whereas the surface exchange process involves dissociative adsorption on surface sites followed by O-incorporation. For Nd 2 NiO 4+δ at 700 • C and 0.2 atm oxygen pressure, D δ = 5.6 · 10 −8 cm 2 s −1 , O = 2.5 · 10 −8 mol · cm −2 s −1 . The present D δ and O values and their activation energies are slightly different to those previously reported for Nd 2 NiO 4+δ using other measurement methodologies, and lower than typical state-of-the-art Co-rich perovskites. However, the average k δ = 1.0 10 −5 cm · s −1 at 700 • C is comparable to those of fast oxygen exchange rate perovskites.

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“…[ 413,414 ] wileyonlinelibrary.com series of Nd 2 NiO 4 powders prepared by solid state reaction, hexamethylenetetramine and citrates methods were used for the preparation of electrodes, separately. [ 415 ] For the Nd 2 NiO 4 electrode with its starting material prepared by solid state reaction, a low porosity was demonstrated, then the oxygen bulk diffusion and a convolution of processes of adsorption and gas diffusion were believed as the rate determining steps, while in the electrodes with the starting powders prepared from the other two methods, the surface oxygen exchange and dissociative adsorption processes were critical for the ORR. These electrochemical impedance analyses showed different electrode microstructures could even partially infl uence its operating mechanism in relation to oxygen interstitial bulk diffusion and oxygen incorporation.…”

Section: Sintering Optimizationmentioning

confidence: 99%

“…These electrochemical impedance analyses showed different electrode microstructures could even partially infl uence its operating mechanism in relation to oxygen interstitial bulk diffusion and oxygen incorporation. [ 415 ] In the following studies, several different strategies, such as combustion synthesis, mechanochemical preparation, microwave synthesis, ball-mill assisted solid-state synthesis and sol-gel synthesis, were performed for the synthesis of Nd 2-x Ce x CuO 4 material so as to optimize the corresponding electrode structure. [416][417][418][419][420] Among them, the lowest polarization resistance was obtained for the Nd 1.8 Ce 0.2 CuO 4 powder with uniform size and shape prepared by a sol-gel method.…”

Section: Sintering Optimizationmentioning

confidence: 99%

Advances in Cathode Materials for Solid Oxide Fuel Cells: Complex Oxides without Alkaline Earth Metal Elements

Chen

Zhou

Ding

et al. 2015

Advanced Energy Materials

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Solid oxide fuel cells (SOFCs) represent one of the cleanest and most efficient options for the direct conversion of a wide variety of fuels to electricity. For example, SOFCs powered by natural gas are ideally suited for distributed power generation. However, the commercialization of SOFC technologies hinges on breakthroughs in materials development to dramatically reduce the cost while enhancing performance and durability. One of the critical obstacles to achieving high‐performance SOFC systems is the cathodes for oxygen reduction reaction (ORR), which perform poorly at low temperatures and degrade over time under operating conditions. Here a comprehensive review of the latest advances in the development of SOFC cathodes is presented: complex oxides without alkaline earth metal elements (because these elements could be vulnerable to phase segregation and contaminant poisoning). Various strategies are discussed for enhancing ORR activity while minimizing the effect of contaminant on electrode durability. Furthermore, some of the critical challenges are briefly highlighted and the prospects for future‐generation SOFC cathodes are discussed. A good understanding of the latest advances and remaining challenges in searching for highly active SOFC cathodes with robust tolerance to contaminants may provide useful guidance for the rational design of new materials and structures for commercially viable SOFC technologies.

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Microstructure and reactivity effects on the performance of Nd2NiO4+δ oxygen electrode on Ce0.9Gd0.1O1.95 electrolyte

Cited by 26 publications

References 48 publications

Review on Ceramic Interphases by Transmission and Scanning Electron Microscopy

Review on Ceramic Interphases by Transmission and Scanning Electron Microscopy

Determination of Electrode Oxygen Transport Kinetics Using Electrochemical Impedance Spectroscopy Combined with Three-Dimensional Microstructure Measurement: Application to Nd₂NiO_4+δ

Advances in Cathode Materials for Solid Oxide Fuel Cells: Complex Oxides without Alkaline Earth Metal Elements

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Microstructure and reactivity effects on the performance of Nd2NiO4+δ oxygen electrode on Ce0.9Gd0.1O1.95 electrolyte

Cited by 26 publications

References 48 publications

Review on Ceramic Interphases by Transmission and Scanning Electron Microscopy

Review on Ceramic Interphases by Transmission and Scanning Electron Microscopy

Determination of Electrode Oxygen Transport Kinetics Using Electrochemical Impedance Spectroscopy Combined with Three-Dimensional Microstructure Measurement: Application to Nd2NiO4+δ

Advances in Cathode Materials for Solid Oxide Fuel Cells: Complex Oxides without Alkaline Earth Metal Elements

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Determination of Electrode Oxygen Transport Kinetics Using Electrochemical Impedance Spectroscopy Combined with Three-Dimensional Microstructure Measurement: Application to Nd₂NiO_4+δ