High performance cobalt-free perovskite cathode for intermediate temperature solid oxide fuel cells

Niu, Yingjie; Zhou, Wei; Ge, Lei; Zhu, Zhonghua; Shao, Zongping

doi:10.1039/c0jm02816a

Cited by 140 publications

(77 citation statements)

References 44 publications

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“…However, thermal expansion coefficient in Co containing system is two times higher than the present system. It might be possible due to higher ionic radii of Ba [19]. The technical alpha curves (differential curves of change in length with temperature) show two broad humps *320 and 650°C for all the samples.…”

Section: Thermal Expansion Coefficient (Tec)mentioning

confidence: 96%

“…Additionally, the Ca 2? substitution may also create the oxygen vacancies [19]. In both the cases, unit cell parameter would decrease.…”

Section: X-ray Diffractionmentioning

confidence: 97%

“…In addition, bismuthbased oxides have positive catalytic effect on oxygen dissociation process [17]. Bi 0.5 Sr 0.5 MnO 3 and Bi 0.5 Sr 0.5 FeO 3 show thermal expansion coefficient less than cobalt based cathodes, but it is still higher than yittrium stabilized zirconia electrolyte [18,19]. Calcium-doped LaFeO 3 has also been studied as a cathode material for high temperature SOFCs [15].…”

Section: Introductionmentioning

confidence: 97%

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Influence of Ca2+ substitution on thermal, structural, and conductivity behavior of Bi1−xCaxFeO3−y (0.40 ≤ x ≤ 0.55)

Thakur

Pandey

Singh

2014

J Therm Anal Calorim

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Bi 1-x Ca x FeO 3-y (0.40 B x B 0.55) perovskite oxides have been synthesized by solid-state reaction method to study their properties as a cathode material for intermediate temperature solid oxide fuel cells. The as prepared samples were characterized by X-ray diffraction, differential thermal analyzer/thermogravimetry, dilatometer, and impedance spectroscopy to study their structural, thermal, and electrical properties. The Rietveld refinement results confirmed that all the samples exhibit tetragonal structure with P4mm space group. In addition to this, sample x = 0.55 exhibits Ca 2 Fe 2 O 5 as a secondary phase. It has been observed that lattice parameters decrease with increase in calcium content. The thermal expansion coefficient and ionic conductivity increases with increase in calcium content up to x = 0.50. The highest ionic conductivity is observed for Bi 0.5 Ca 0.5 FeO 3-y i.e. 1.71 9 10 -2 S cm -1 .

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Section: Thermal Expansion Coefficient (Tec)mentioning

confidence: 96%

“…Additionally, the Ca 2? substitution may also create the oxygen vacancies [19]. In both the cases, unit cell parameter would decrease.…”

Section: X-ray Diffractionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

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Influence of Ca2+ substitution on thermal, structural, and conductivity behavior of Bi1−xCaxFeO3−y (0.40 ≤ x ≤ 0.55)

Thakur

Pandey

Singh

2014

J Therm Anal Calorim

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“…It is also worth noting that all the previous studies used cobalt-containing cathode materials to achieve high cell performance, since normally Co-containing cathodes show good catalytic activity and proper ionic conductivity at intermediate temperatures [30]. However, the thermal expansion mismatch, the low thermal stability, as well as the evaporation and diffusion of cobalt element for these cathodes could result in cell degradation that needs further optimization [48,49] …”

Section: Articlesmentioning

confidence: 99%

Nanostructuring the electronic conducting La0.8Sr0.2MnO3−δ cathode for high-performance in proton-conducting solid oxide fuel cells below 600°C

Da’as

Boulfrad

et al. 2017

Sci. China Mater.

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“…[124][125][126] For instance, Petitjean et al compared the bulk oxygen tracer diffusivity between La0.8Sr0.2MnO3 and La0.8Sr0.2FeO3-δ, and observed that the bulk oxygen diffusion of the latter is faster than the former by nearly six orders of magnitude. 127 The better catalytic activity of Fe-based perovskite is primarily ascribed to its available oxygen vacancies and therefore high ionic conduction.…”

Section: Iron-based Perovskite Oxidesmentioning

confidence: 99%

Development of cathode materials for intermediate temperature solid oxide fuel cells

Li¹

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A solid oxide fuel cell (SOFC) is a promising energy device that can generate electricity by converting chemical energy of nearly all types of fuels with very high efficiency. However, its high operating temperature (> 850°C) is the main impediment to deploying this technology, because high temperature can lead to sealing issues, slow start-up/shut-down procedures, poor thermal cycling stability, poor fuel cell durability, as well as high material and operational cost. Lowering the operating temperature down to intermediate temperature (IT, is an effective and significant strategy to solve these issues, but it makes the kinetics of electrolyte and electrodes especially the cathode sluggish. Despite slow kinetics of electrolyte have been significantly alleviated by using novel electrolyte materials and thin film fabrication technology, low electroactivity of IT-SOFC cathode still remains a major challenge. Besides, the susceptibility of cathodes containing alkaline-earth elements to CO2 is another concern on long-term cathode stability, especially at low temperature. Therefore, developing a robust cathode material with high electroactivity is significant for commercialising SOFC technology, and have received growing research interest and efforts in recent years.This thesis is mainly focused on developing highly active and stable cathode materials based on SrCoO3-δ perovskite oxide for IT-SOFC. The factors affecting catalysis on oxygen reduction reaction (ORR), and the CO2-poisoning mechanisms on the SrCoO3-δ-based cathodes at intermediate temperature were investigated. In this thesis, we developed and evaluated SrCoO3-δ doped with highvalence elements such as P, Nb, and Ta as cathodes for SOFC by studying their crystal structures, compositions, microstructures and electrochemical properties as well as electroactivity in ORR at intermediate temperature.In the first part of the experimental chapters, we mainly worked on developing SrCoO3-δ-based cathode materials and studying the effects of high fixed valence dopants (P, Ta, and Nb) on SrCoO3-δ perovskite cathode for IT-SOFC. We successfully doped P and Ta into SrCoO3-δ oxide separately, and found these dopants at certain doping level can stabilise the beneficial perovskite structure at both room temperature and intermediate temperature. The study on P-doped SrCoO3-δ reveals that the stabilising effect of P is a result of the high-valence that prevents oxygen vacancy ordering and phase distortions. The electrical conductivity of SrCoO3-δ can be enhanced by small amount of P or Ta (≤ 5 mol%) due to the stabilized perovskite structure and high valence of P and Ta, but can be adversely affected for higher doping level as shown in study on SrCo1-xTaxO3-δ. Additionally, SrCoO3-δ doped with <20 mol% Ta shows superior electroactivity on ORR at IT, with a cathode polarisation resistance as low as 0.089~0.11 Ω·cm 2 at 550°C for SrCo0.95Ta0.05O3-δ. However, the high fixed valence can II decrease oxygen vacancy content, so high doping level (e.g. 40mol%) of Ta can ser...

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High performance cobalt-free perovskite cathode for intermediate temperature solid oxide fuel cells

Cited by 140 publications

References 44 publications

Influence of Ca2+ substitution on thermal, structural, and conductivity behavior of Bi1−xCaxFeO3−y (0.40 ≤ x ≤ 0.55)

Influence of Ca2+ substitution on thermal, structural, and conductivity behavior of Bi1−xCaxFeO3−y (0.40 ≤ x ≤ 0.55)

Nanostructuring the electronic conducting La0.8Sr0.2MnO3−δ cathode for high-performance in proton-conducting solid oxide fuel cells below 600°C

Development of cathode materials for intermediate temperature solid oxide fuel cells

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