Characterization of electrical properties of GDC doped A-site deficient LSCF based composite cathode using impedance spectroscopy

Fu, Qiang; Sun, Kening; Zhang, Naiqing; Zhu, Xiaodong; Le, Shiru; Zhou, Dengwang

doi:10.1016/j.jpowsour.2007.03.040

Cited by 139 publications

(84 citation statements)

References 38 publications

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“…They are comprised in the 6 × 10 obvious dependence on temperature can be established. This modelling is similar to the one published in [13,16,17] and confirms that this part of the diagram is due to cathode phenomena occurring at the cathode/electrolyte interface, as for instance, the charge transfer [18,19]. For LSCF, the LF part of the diagram can be modelled with a third R-CPE circuit.…”

Section: Medium and Low Frequency Contributionssupporting

confidence: 84%

Validation of BaIn_0.3Ti_0.7O_2.85 as SOFC Electrolyte with Nd₂NiO₄, LSM and LSCF as Cathodes

et al. 2009

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Due to its high ionic conductivity level, BaIn0.3Ti0.7O2.85 (BIT07) is a potential electrolyte material for SOFC. In order to validate the use of this material, its chemical, mechanical and electromechanical compatibilities with three classical cathode materials (La0.7Sr0.3MnO3 – δ (LSM), La0.58Sr0.4Co0.2Fe0.8O3 – δ (LSCF) and Nd2NiO4 + δ) have been tested. The chemical compatibility has been demonstrated by XRD experiments, which show that BIT07 does not react with the cathode materials below 1,000 °C. The mechanical compatibility has been investigated by combining measurements of the thermal expansion coefficients of the cathode materials from X‐ray thermo diffraction and SEM observations. Symmetrical cells cathode/electrolyte/cathode have been studied by electrochemical impedance spectroscopy in order to quantify the quality of the cathode/electrolyte interface and to study the long‐term stability of the cell. The main conclusion of the study is that LSCF presents the best compromise between an acceptable mechanical compatibility and very good electrical properties with BIT07.

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Section: Medium and Low Frequency Contributionssupporting

confidence: 84%

Validation of BaIn_0.3Ti_0.7O_2.85 as SOFC Electrolyte with Nd₂NiO₄, LSM and LSCF as Cathodes

et al. 2009

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“…Through AC impedance spectroscopy, the addition of GDC to the LSCF cathode can enhance the rate of oxygen diffusion along the component interface. Thus, in the composite, an increase in the electrochemical reaction zone has been achieved (Qiang et al, 2007).…”

Section: Ceria-based Materials (Gdc and Sdc)mentioning

confidence: 97%

“…An open-circuit voltage of 0.94 V was also obtained from the same operating temperature (Zuo et al, 2012). The polarization resistance of an LSCF-GDC composite at an operating temperature of 750 °C was 0.11 Ω·cm 2 , whereas that of LSCF-SDC was 0.074 Ω·cm 2 (Qiang et al, 2007;Nie et al, 2010a). This small difference still proves that SDC is more suitable in forming composite cathodes with LSCF, which explains the current trend of using SDC in IT-LTSOFCs.…”

Section: Ceria-based Materials (Gdc and Sdc)mentioning

confidence: 99%

Development of lanthanum strontium cobalt ferrite composite cathodes for intermediate- to low-temperature solid oxide fuel cells

Baharuddin

Rahman

Muchtar

et al. 2013

J. Zhejiang Univ. Sci. A

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Solid oxide fuel cells (SOFCs) offer high energy conversion, low noise, low pollutant emission, and low processing cost. Despite many advantages, SOFCs face a major challenge in competing with other types of fuel cells because of their high operating temperature. The necessity to reduce the operational temperature of SOFCs has led to the development of research into the materials and fabrication technology of fuel cells. The use of composite cathodes significantly reduces the cathode polarization resistance and expands the triple phase boundary area available for oxygen reduction. Powder preparation and composite cathode fabrication also affect the overall performance of composite cathodes and fuel cells. Among many types of cathode materials, lanthanum-based materials such as lanthanum strontium cobalt ferrite (La 1-x Sr x Co 1-y Fe y O 3-δ ) have recently been discovered to offer great compatibility with ceria-based electrolytes in performing as composite cathode materials for intermediate-to low-temperature SOFCs (IT-LTSOFCs). This paper reviews various ceria-based composite cathodes for IT-LTSOFCs and focuses on the aspects of progress and challenges in materials technology.

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“…One possible strategy is to mix LSCF with the electrolyte gadolinia-doped ceria (GDC). It is reported that after infiltration with ionic conductive GDC, the microstructure stability, the ionic conductivity, the oxygen reduction activity as well as the adhesion to electrolyte of LSCF cathode could be improved [25][26][27][28][29][30][31]. For instance, the polarization resistance of La0.8Sr0.2Co0.5Fe0.5O3−δ-GDC composite decreased to 1.6 Ω cm 2 at 650 °C [31], and that of La0.6Sr0.4Co0.2Fe0.8O3-δ-GDC, fabricated by impregnation, reached values as low as 0.24 Ω cm 2 at 600 °C.…”

Section: Introductionmentioning

confidence: 99%

B-Site Metal (Pd, Pt, Ag, Cu, Zn, Ni) Promoted La1−xSrxCo1−yFeyO3–δ Perovskite Oxides as Cathodes for IT-SOFCs

Guo

Puleo

et al. 2015

Catalysts

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Perovskite oxides La1−xSrxCo1−yFeyO3-δ (LSCF) have been extensively investigated and developed as cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs) due to mixed ionic-electronic conductivity and high electrooxygen reduction activity for oxygen reduction. Recent literature investigations show that cathode performances can be improved by metal surface modification or B-site substitution on LSCF. Although the specific reaction mechanism needs to be further investigated, the promoting effect of metal species in enhancing oxygen surface exchange and oxygen bulk diffusion is well recognized. To our knowledge, no previous reviews dealing with the effect of metal promotion on the cathodic performances of LSCF materials have been reported. In the present review, recent progresses on metal (Pd, Pt, Ag, Cu, Zn, Ni) promotion of LSCF are discussed focusing on two main aspects, the different synthesis approaches used (infiltration, deposition, solid state reaction, one pot citrate method) and the effects of metal promotion on structural properties, oxygen vacancies content and cathodic performances. The novelty of the work lies in the fact that the metal promotion at the B-site is discussed in detail, pointing at the effects produced by two different approaches, the LSCF surface modification by the metal or the metal ion substitution at the B-site of the perovskite. Moreover, for the first time in a review article, the importance of the combined effects of oxygen dissociation rate and interfacial oxygen transfer rate between the metal phase and the cathode phase is addressed for OPEN ACCESSCatalysts 2015, 5 367 metal-promoted LSCF and compared with the un-promoted oxides. Perspectives on new research directions are shortly given in the conclusion.

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Characterization of electrical properties of GDC doped A-site deficient LSCF based composite cathode using impedance spectroscopy

Cited by 139 publications

References 38 publications

Validation of BaIn_0.3Ti_0.7O_2.85 as SOFC Electrolyte with Nd₂NiO₄, LSM and LSCF as Cathodes

Validation of BaIn_0.3Ti_0.7O_2.85 as SOFC Electrolyte with Nd₂NiO₄, LSM and LSCF as Cathodes

Development of lanthanum strontium cobalt ferrite composite cathodes for intermediate- to low-temperature solid oxide fuel cells

B-Site Metal (Pd, Pt, Ag, Cu, Zn, Ni) Promoted La1−xSrxCo1−yFeyO3–δ Perovskite Oxides as Cathodes for IT-SOFCs

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Characterization of electrical properties of GDC doped A-site deficient LSCF based composite cathode using impedance spectroscopy

Cited by 139 publications

References 38 publications

Validation of BaIn0.3Ti0.7O2.85 as SOFC Electrolyte with Nd2NiO4, LSM and LSCF as Cathodes

Validation of BaIn0.3Ti0.7O2.85 as SOFC Electrolyte with Nd2NiO4, LSM and LSCF as Cathodes

Development of lanthanum strontium cobalt ferrite composite cathodes for intermediate- to low-temperature solid oxide fuel cells

B-Site Metal (Pd, Pt, Ag, Cu, Zn, Ni) Promoted La1−xSrxCo1−yFeyO3–δ Perovskite Oxides as Cathodes for IT-SOFCs

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Validation of BaIn_0.3Ti_0.7O_2.85 as SOFC Electrolyte with Nd₂NiO₄, LSM and LSCF as Cathodes

Validation of BaIn_0.3Ti_0.7O_2.85 as SOFC Electrolyte with Nd₂NiO₄, LSM and LSCF as Cathodes