Effect of Nd-deficiency on electrochemical properties of NdBaCo2O6−δ cathode for intermediate-temperature solid oxide fuel cells

Yi, Kaihua; Sun, Liping; Li, Qiang; Xia, Tian; Huo, Li‐Hua; Zhao, Hui; Li, Jingwei; Lü, Zhe; Bassat, Jean‐Marc; Rougier, Aline; Fourcade, Sébastien; Grenier, Jean‐Claude

doi:10.1016/j.ijhydene.2016.04.248

Cited by 44 publications

(25 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As the degree of non-stoichiometry of the A / -site increases in the Sm 1−x BaCo 2 O 5+d oxide systems, the value of the activation energy tends to decrease. This trend can also be confirmed in works in the literature that have studied the electrochemical properties of similar layered perovskite structure composition in which the A / -site is partially removed (Jiang et al, 2014;Yi et al, 2016). As a result of calculating the activation energy values, as shown in Figure 2A (Clematis et al, 2019;Anbo et al, 2020).…”

Section: Resultssupporting

confidence: 74%

“…Strategies to develop not only excellent cathode materials for IT-SOFCs by substituting various materials into layered perovskite, but also non-stoichiometric cathode materials synthesized by removing individual elements of layered perovskite are being pursued (Kostogloudis and Ftikos, 1999;Wang et al, 2014;Sun et al, 2016;Yi et al, 2016). Based on the composition PrBaCo 2 O 5+d , PrBa 0.92 Co 2 O 5+d , in which 0.08 mol% of Ba was removed from the A // -site, showed better electrochemical properties than the composition PrBaCo 2 O 5+d .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced Electrochemical Properties of Non-stoichiometric Layered Perovskites, Sm1−xBaCo2O5+d, for IT-SOFC Cathodes

et al. 2021

View full text Add to dashboard Cite

In this study, electrochemical properties of layered perovskites having non-stoichiometric compositions (Sm1−xBaCo2O5+d, x = 0, 0. 01, 0.02, 0.03, 0.04, 0.05, 0.10, and 0.15) were analyzed for the direct application of cathode materials for Intermediate Temperature-operating Solid Oxide Fuel Cells (IT-SOFC). From the Sm1−xBaCo2O5+d oxide systems calcined at 1,100°C for 8 h, single phase (SmBaCo2O5+d, SBCO_1) was maintained only in the case of the x = 0 composition. In the compositions of x = 0.05–0.10, BaCoO2.6 was mixed with the pattern of SBCO. In addition, in the composition of x = 0.15, it was confirmed that BaCoO2.6 and CoO phases coexisted with SBCO. In the compositions of Sm1−xBaCo2O5+d, the overall Area Specific Resistance (ASR) values decreased as the removal amount of Sm increased from x = 0–0.10; then, the values increased for compositions from x = 0.15. For example, the ASRs of SBCO_1, Sm0.95BaCo2O5+d (SBCO_0.95), Sm0.90BaCo2O5+d (SBCO_0.90), and Sm0.85BaCo2O5+d (SBCO_0.85) measured at 600°C were 0.301, 0.147, 0.119, and 0.179 Ω cm2, respectively. In particular, SBCO_0.90 was found to have an excellent ASR property of about 0.035 Ω cm2 at 700°C. Typical properties of the metal–insulator transition (MIT) electrical conductivity were shown in all measured compositions. The temperature at which MIT occurred increased as the non-stoichiometric composition increased.

show abstract

Section: Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Enhanced Electrochemical Properties of Non-stoichiometric Layered Perovskites, Sm1−xBaCo2O5+d, for IT-SOFC Cathodes

et al. 2021

View full text Add to dashboard Cite

show abstract

“…A clear evidence is obtained for the LF process: an absence of temperature dependency is typical of gas diffusion, which is an almost non-activated phenomenon. The high capacitance values are also supporting this assumption [85][86][87][88]. With respect to the PS sample, at 750°C, the second contribution has a characteristic frequency f REL which is 4 orders of magnitude larger than the results of the measurements at 800 and 850°C.…”

Section: Equivalent Circuit Modelling (Ecm)supporting

confidence: 62%

“…Typical E ACT for Co-based layered perovskites range between 0.91 eV and 1. 86 [80]. Very low E ACT values are instead obtained in the HT range, i.e., 0.37-0.39 eV.…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 92%

Electrochemical characterization of PrBa2−xSrxCu3O6+δ layered oxides as innovative and efficient oxygen electrode for IT-SOFCs

et al. 2020

Self Cite

View full text Add to dashboard Cite

PrBa 2 Cu 3 O 6+δ (P) and PrBa 1.5 Sr 0.5 Cu 3 O 6+δ (PS) layered perovskite-type oxides are synthesized and characterized as oxygen electrodes in IT-SOFCs. The layered structure of P and PS compounds is constituted by the regular alternation along the crystallographic c axis of Pr O planes, Cu 2+ chains (CN = 4) and Cu 3+ pyramidal (CN = 5) layers. Interesting features of the PrBa 2 Cu 3 O 6+δ structure are the absence of cobalt, the presence of aliovalent cations and large amounts of oxygen vacancies. The substitution of 25% Ba with Sr is evaluated in order to improve the electronic conductivity of the undoped material. The compounds are synthesized via Citrate-Nitrate procedure and characterized by XRPD, 4-probe conductivity tests (100-800°C) and EIS measurements on symmetric cells in air varying the temperature (450-850°C). SEM images of post mortem cells are collected to evaluate the adhesion between components, layers thickness and particle morphology. Sr doping does not significantly improve the electrical conductivity but prompts a considerable hysteresis in the P sample between the cooling and the heating ramps. Conductivity values are lower than 100 S cm − 1 , but no electrical limitations are observed in EIS results. The introduction of a thin PrDC interlayer greatly reduces the Area Specific Resistances for both the compounds and the 0.15 Ω cm 2 target is almost fulfilled at 600°C (0.17 Ω cm 2 for PS + PrDC sample).

show abstract

“…The double perovskites RBaCo 2 O 6−δ (where R is a rare-earth element) have been recently proposed as potential cathode materials for intermediate-temperature SOFCs (IT-SOFCs) because of their fast oxide ion transport, high mixed ionic and electronic conductivity as well as high catalytic activity with respect to the oxygen reduction [1][2][3][4][5][6][7][8][9][10][11][12][13]. PrBaCo 2 O 6−δ (PBC) was shown to possess the most attractive properties [1,4,[6][7][8][14][15][16] among the variety of cobaltites with double perovskite structure and, consequently, can be considered as one of the most promising cathode materials.…”

Section: Introductionmentioning

confidence: 99%

PrBaCo2O6−δ-Ce0.8Sm0.2O1.9 Composite Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells: Stability and Cation Interdiffusion

et al. 2019

View full text Add to dashboard Cite

The single-phase oxide PrBaCo2O6−δ and composites (100 − y)PrBaCo2O6−δ-yCe0.8Sm0.2O1.9 (y = 10–30 wt.%) were investigated as cathode materials for intermediate-temperature solid oxide fuel cells. The chemical compatibility, cation interdiffusion, thermal expansion and dc conductivity were studied. As a result, strong interdiffusion of Pr and Sm was found between PrBaCo2O6−δ and Ce0.8Sm0.2O1.9. This leads to only insignificantly decreasing thermal expansion coefficient of composite with increasing fraction of Ce0.8Sm0.2O1.9 and, thus, mixing PrBaCo2O6−δ with Ce0.8Sm0.2O1.9 does not improve thermal expansion behavior of the cathode material. Moreover, formation of poorly-conducting BaCeO3, caused by chemical interaction between the double perovskite and doped ceria, was shown to lead to pronounced drop in the electrical conductivity of the composite cathode material with increasing Ce0.8Sm0.2O1.9 content.

show abstract

Effect of Nd-deficiency on electrochemical properties of NdBaCo2O6−δ cathode for intermediate-temperature solid oxide fuel cells

Cited by 44 publications

References 61 publications

Enhanced Electrochemical Properties of Non-stoichiometric Layered Perovskites, Sm1−xBaCo2O5+d, for IT-SOFC Cathodes

Enhanced Electrochemical Properties of Non-stoichiometric Layered Perovskites, Sm1−xBaCo2O5+d, for IT-SOFC Cathodes

Electrochemical characterization of PrBa2−xSrxCu3O6+δ layered oxides as innovative and efficient oxygen electrode for IT-SOFCs

PrBaCo2O6−δ-Ce0.8Sm0.2O1.9 Composite Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells: Stability and Cation Interdiffusion

Contact Info

Product

Resources

About