High Performance LSC Infiltrated LSCF Oxygen Electrode for High Temperature Steam Electrolysis Application

Vibhu, Vaibhav; Yildiz, Saffet; Vinke, Izaak C.; Eichel, Rüdige.-A.; Bassat, Jean‐Marc; Haart, L.G.J. de

doi:10.1149/2.0741902jes

Cited by 24 publications

(17 citation statements)

References 70 publications

(88 reference statements)

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“…So far, deficient perovskites have been extensively studied as oxygen electrodes [22][23][24]. Particularly, the current state-of-the-art LSCF oxygen electrode shows good ionic and electronic conductivity, more than the conventional LSM electrode which shows a predominant electronic conductivity [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Particularly, the current state-of-the-art LSCF oxygen electrode shows good ionic and electronic conductivity, more than the conventional LSM electrode which shows a predominant electronic conductivity [6,7]. However, this Sr 2+ -containing electrode exhibits Sr-segregation as well as phase change from rhombohedral to cubic, which results in deterioration of the electrode performance, especially during long-term operation [22][23][24]. Therefore, to avoid such issues, lanthanide nickelates Ln 2 NiO 4+δ (Ln = La, Pr, or Nd) based oxygen over stoichiometric materials with a K 2 NiF 4 -type structure are considered as an alternative oxygen electrode.…”

Section: Introductionmentioning

confidence: 99%

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Sr Substituted La2−xSrxNi0.8Co0.2O4+δ (0 ≤ x ≤ 0.8): Impact on Oxygen Stoichiometry and Electrochemical Properties

et al. 2022

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Lanthanide nickelate Ln2NiO4+δ (Ln = La, Pr, or Nd) based mixed ionic and electronic conducting (MIEC) materials have drawn significant attention as an alternative oxygen electrode for solid oxide cells (SOCs). These nickelates show very high oxygen diffusion coefficient (D*) and surface exchange coefficient (k*) values and hence exhibit good electrocatalytic activity. Earlier reported results show that the partial substitution of Co2+ at B-site in La2Ni1−xCoxO4+δ (LNCO) leads to an enhancement in the transport and electrochemical properties of the material. Herein, we perform the substitution at A-site with Sr, i.e., La2−xSrxNi0.8Co0.2O4+δ, in order to further investigate the structural, physicochemical, and electrochemical properties. The structural characterization of the synthesized powders reveals a decrease in the lattice parameters as well as lattice volume with increasing Sr content. Furthermore, a decrease in the oxygen over stoichiometry is also observed with Sr substitution. The electrochemical measurements are performed with the symmetrical half-cells using impedance spectroscopy in the 700–900 °C temperature range. The total polarization resistance of the cell is increased with Sr substitution. The electrode reaction mechanism is also studied by recording the impedance spectra under different oxygen partial pressures. Finally, the kinetic parameters are investigated by analyzing the impedance spectra under polarization. A decrease in exchange current density (i0) is observed with increasing Sr content.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sr Substituted La2−xSrxNi0.8Co0.2O4+δ (0 ≤ x ≤ 0.8): Impact on Oxygen Stoichiometry and Electrochemical Properties

et al. 2022

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“…La1−xSrxCo1−yFeyO3−δ (LSCF) [7][8][9][10], La1−xSrxCoO3−δ (LSC) [11][12][13], Ba1−xSrxCo1−yFeyO3−δ (BSCF) [14,15]. However these La, Sr-cobaltites based oxygen electrode materials have inherent disadvantages: (a) a Sr-segregation leading to the formation of SrZrO3 insulating phase [16][17][18][19]; (b) high values of thermal expansion coefficients [4,5] and (c) a crystallographic phase transition from rhombohedral to cubic [20], leading to a degradation of the cell performances. Ba, Sr-cobaltites based oxygen materials also exhibit a poor chemical stability [21].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical ageing study of mixed lanthanum/praseodymium nickelates La2-Pr NiO4+δ as oxygen electrodes for solid oxide fuel or electrolysis cells

Vibhu

Flura

Rougier

et al. 2020

Journal of Energy Chemistry

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The chemical and electrochemical stability of lanthanide nickelates La2NiO4+δ (LNO), Pr2NiO4+δ (PNO) and their mixed compounds La2-xPrxNiO4+δ (LPNOs) with x = 0.5, 1 or 1.5 is reported. The aim is to promote these materials as efficient electrodes for solid oxide fuel cell (SOFC) and/or solid oxide electrolysis cell (SOEC). La2NiO4+δ and La1.5Pr0.5NiO4+δ compounds are chemically very stable as powders over one month in the temperature range 600 − 800 °C, while the other materials rich in praseodymium progressively decompose into various perovskite-deriving components with additional Pr6O11. Despite their uneven properties, all these materials are quite efficient and sustainable as electrodes on top of gadolinium doped ceria (GDCBL) // yttrium doped zirconia (8YSZ) electrolyte, for one month at 700 °C without polarization. Under polarization (300 mA•cm-2), the electrochemical performances of LNO, PNO and La1.5Pr0.5NiO4+δ (LP5NO) quickly degrade in SOFC mode, i.e. for the oxygen reduction reaction, while they show durability in SOEC mode, i.e. for the oxide oxidation reaction.

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“…also enhanced LSCF electrode performance by modifying the cathode surface through the infiltration of La 0.6 Sr 0.4 CoO 3− δ (LSC). At 800°C with 50% H 2 and 50% H 2 O under OCV conditions, LSC‐infiltrated single cells showed an R p of 0.06 Ω cm 2 , 25% smaller than the conventional LSCF 66 . Tomov et al.…”

Section: Modification Strategies For Different Goalsmentioning

confidence: 99%

Surface decorations to abrupt change performance, robustness, and stability of electrodes for solid oxide cells

et al. 2022

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Solid oxide cell electrodes need to display a wide range of combined properties, for example, electronic and ionic conductivities, catalytic activity, chemical compatibility with other parts, thermal expansion match, phase stability, and tolerance to foreign species/contaminants. It is extremely challenging for a single material to meet all these features required. Surface decoration is a remarkably adaptive strategy to provide needed features to the electrodes by introducing functioning materials through various target‐guided methods. This review provides an overview of typical and novel techniques to create surface decoration on the electrodes to abruptly improve the drawbacks of the electrodes of solid oxide cells, including performance enhancement, stability of long‐term operation, and tolerance to poisoning foreign species. It starts with the introduction of surface decoration experimental procedure, proceeds to crucial characterization methods that are particularly effective in identifying the properties of the surface coating, continues with target‐oriented practice in terms of surface decoration materials choice and microstructure manipulation, and ends with the explorations of functioning mechanisms for the resultant behavior. With hope, the review will spark more novel utilizations of surface decoration practice to promote the technical status of the solid oxide cells for widespread commercialization in the future.

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High Performance LSC Infiltrated LSCF Oxygen Electrode for High Temperature Steam Electrolysis Application

Cited by 24 publications

References 70 publications

Sr Substituted La2−xSrxNi0.8Co0.2O4+δ (0 ≤ x ≤ 0.8): Impact on Oxygen Stoichiometry and Electrochemical Properties

Sr Substituted La2−xSrxNi0.8Co0.2O4+δ (0 ≤ x ≤ 0.8): Impact on Oxygen Stoichiometry and Electrochemical Properties

Electrochemical ageing study of mixed lanthanum/praseodymium nickelates La2-Pr NiO4+δ as oxygen electrodes for solid oxide fuel or electrolysis cells

Surface decorations to abrupt change performance, robustness, and stability of electrodes for solid oxide cells

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