Properties and performance of La1.6Sr0.4NiO4+δ–Ce0.8Sm0.2O1.9 composite cathodes for intermediate temperature solid oxide fuel cells

Gong, Mingguang; Lu, Lingbin; Zhang, Huanhuan; Gao, Lian; Guo, Youbin; Jiang, Jin

doi:10.1016/j.materresbull.2009.04.016

Cited by 16 publications

(10 citation statements)

References 21 publications

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“…Interestingly, an increasing Sr content suppresses the anisotropy of true lattice thermal expansion, whereas average true TEC values,

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( V 1/3 ), show rather minor variations with composition and also are close to those calculated from dilatometric data. Average thermochemical expansion coefficients values calculated from the high‐temperature XRD data at 25–900 °C increase slightly with x (Table ) and are also comparable to TECs reported previously for (La 1− x Sr x ) 2 NiO 4− δ ceramics . These average values exceed the corresponding TECs of common solid electrolytes, such as stabilized zirconia or doped ceria and lanthanum gallate, to some extent but still seem to be low enough to ensure thermomechanical compatibility with electrolyte ceramics.…”

Section: Resultssupporting

confidence: 84%

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Impact of Oxygen Deficiency on the Electrochemical Performance of K₂NiF₄‐Type (La_1−xSr_x)₂NiO_4−δ Oxygen Electrodes

et al. 2016

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Perovskite-related (La Sr ) NiO (x=0.5-0.8) phases were explored for possible use as oxygen electrodes in solid electrolyte cells with a main focus on the effect of oxygen deficiency on the electrocatalytic activity. (La Sr ) NiO solid solutions were demonstrated to preserve the K NiF -type tetragonal structure under oxidizing conditions. Acceptor-type substitution by Sr is compensated by the formation of oxygen vacancies and electron holes and progressively increases high-temperature oxygen nonstoichiometry, which reaches as high as δ=0.40 for x=0.8 at 950 °C in air. The electrical conductivity of (La Sr ) NiO ceramics at 500-1000 °C and p(O )≥10 atm is p-type metallic-like. The highest conductivity, 300 S cm at 800 °C in air, is observed for x=0.6. The average thermal expansion coefficients, (14.0-15.4)×10 K at 25-900 °C in air, are sufficiently low to ensure the thermomechanical compatibility with common solid electrolytes. The polarization resistance of porous (La Sr ) NiO electrodes applied on a Ce Gd O solid electrolyte decreases with increasing Sr concentration in correlation with the concentration of oxygen vacancies in the nickelate lattice and the anticipated level of mixed ionic-electronic conduction. However, this is accompanied by increasing reactivity between the cell components and necessitates the microstructural optimization of the electrode materials to reduce the electrode fabrication temperature.

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“…Interestingly, an increasing Sr content suppresses the anisotropy of true lattice thermal expansion, whereas average true TEC values,

\overset{α}{true}

Section: Resultssupporting

confidence: 84%

“…For instance, Li et al . reported that no reaction between La‐rich (La 0.8 Sr 0.2 ) 2 NiO 4± δ and CGO10 occurs at 1100 °C, whereas Gong et al . evidenced a “slight” reaction between (La 0.8 Sr 0.2 ) 2 NiO 4+ δ and the SDC electrolyte based on a change of lattice parameters.…”

Section: Resultsmentioning

confidence: 99%

Impact of Oxygen Deficiency on the Electrochemical Performance of K₂NiF₄‐Type (La_1−xSr_x)₂NiO_4−δ Oxygen Electrodes

et al. 2016

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“…With the addition of YSZ, TECs of the composite cathode matched better with YSZ electrolyte, and the electrochemical performance was improved. The similar effect has been obtained in the La 1.6 Sr 0.4 NiO 4 -SDC and Ba 1.2 Sr 0.8 CoO 4 -CGO composite cathodes [65,66]. The addition of precious metals such as Ag into cathodes has been considered to enhance the electrocatalytic activity for the oxygen reduction reaction [67].…”

Section: Polarization Resistancesupporting

confidence: 60%

Ln2MO4 cathode materials for solid oxide fuel cells

Zhao

Sun

2011

Sci. China Chem.

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One of the major challenges to develop "intermediate temperature" solid oxide fuel cells is finding a novel cathode material, which can meet the following requirements: (1) high electronic conductivity; (2) chemical compatibility with the electrolyte; (3) a matched thermal expansion coefficient (TEC); (4) stability in a wide range of oxygen partial pressure; and (5) high catalytic activity for the oxygen reduction reaction (ORR). In this short review, a survey of these requirements for K 2 NiF 4 -type material with the formula Ln 2 MO 4 , Ln = La, Pr, Nd, Sm; M = Ni, Cu, Fe, Co, Mn, is presented. The composition-dependent TEC, electrical conductivity and oxygen transport property are considered. The Ln 2 MO 4 materials exhibit improved chemical stability and compatibility with most of the traditional electrolytes. The complete fuel cells integrated with Ln 2 MO 4 materials as cathodes show promising results. Furthermore, these materials are considered as cathodes of protonic ceramic fuel cell (PCFC), and/or anodes of high temperature steam electrolysis (HTSE). First results show excellent performances. The versatility of these Ln 2 MO 4 materials is explained on the basis of structural features and the ability to accommodate oxygen nonstoichiometry.intermediate temperature solid oxide fuel cells (ITSOFCs), cathode, K 2 NiF 4 -type structure, oxygen non-stoichiometry

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“…L in the equivalent circuit represents the lead inductance. Inductive effect for cell is reported in literature [35,36]. The low-frequency response (Fig.…”

Section: à ámentioning

confidence: 93%

Electrochemical performance of strontium-doped neodymium nickelate mixed ionic–electronic conductor for intermediate temperature solid oxide fuel cells

Khandale

Punde²,

Bhoga

2012

J Solid State Electrochem

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The Nd 2− x Sr x NiO 4+δ (x00.1-0.5) solid solutions prepared by combustion synthesis are of submicron/superfine crystallite size. The crystal structure estimated by Rietveld analysis reveals increase in space in the rock salt layer on partial replacement of Nd 3+ by Sr 2+ . The transition from negative temperature coefficient to positive temperature coefficient of conductivity is observed at 913 K. The maximum dc conductivity (σ01.3±0.02 Scm −1 at 973 K) is obtained for x00.2 in Nd 2− x Sr x NiO 4+δ . The low dc conductivity compared with reported (≈100 Scm −1 ) is due to high porosity (low relative density) resulting from agglomeration of submicron crystallites. The variation in the conductivity with Sr content in Nd 2−x Sr x NiO 4+δ is understood on the basis of defect chemistry. The electrochemical properties of the cathode materials are studied using electrochemical impedance spectroscopy at various temperatures and oxygen partial pressures. Nd 1.8 Sr 0.2 NiO 4+δ cathode exhibits lowest-area-specific resistance 00.52 ± 0.015 Ohm cm 2 at 973 K. At low P O 2 (<1,000 Pa), oxygen ion transfer from Nd 1.8 Sr 0.2 NiO 4+δ cathode to gadolinium-doped ceria electrolyte is the rate-limiting step, whereas, charge-transfer reaction on the cathode becomes more important at high oxygen partial pressures and temperature (973 K).

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Properties and performance of La1.6Sr0.4NiO4+δ–Ce0.8Sm0.2O1.9 composite cathodes for intermediate temperature solid oxide fuel cells

Cited by 16 publications

References 21 publications

Impact of Oxygen Deficiency on the Electrochemical Performance of K₂NiF₄‐Type (La_1−xSr_x)₂NiO_4−δ Oxygen Electrodes

Impact of Oxygen Deficiency on the Electrochemical Performance of K₂NiF₄‐Type (La_1−xSr_x)₂NiO_4−δ Oxygen Electrodes

Ln2MO4 cathode materials for solid oxide fuel cells

Electrochemical performance of strontium-doped neodymium nickelate mixed ionic–electronic conductor for intermediate temperature solid oxide fuel cells

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Properties and performance of La1.6Sr0.4NiO4+δ–Ce0.8Sm0.2O1.9 composite cathodes for intermediate temperature solid oxide fuel cells

Cited by 16 publications

References 21 publications

Impact of Oxygen Deficiency on the Electrochemical Performance of K2NiF4‐Type (La1−xSrx)2NiO4−δ Oxygen Electrodes

Impact of Oxygen Deficiency on the Electrochemical Performance of K2NiF4‐Type (La1−xSrx)2NiO4−δ Oxygen Electrodes

Ln2MO4 cathode materials for solid oxide fuel cells

Electrochemical performance of strontium-doped neodymium nickelate mixed ionic–electronic conductor for intermediate temperature solid oxide fuel cells

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Impact of Oxygen Deficiency on the Electrochemical Performance of K₂NiF₄‐Type (La_1−xSr_x)₂NiO_4−δ Oxygen Electrodes

Impact of Oxygen Deficiency on the Electrochemical Performance of K₂NiF₄‐Type (La_1−xSr_x)₂NiO_4−δ Oxygen Electrodes