Investigation on thermal, electrical, and electrochemical properties of scandium-doped Pr0.6Sr0.4(Co0.2Fe0.8)(1−x)ScxO3−δ as cathode for IT-SOFC

Yin, Yi; Xiong, Mingwen; Yang, Naitao; Tong, Ze; Guo, Yongxian; Ma, Zhenqiang; Sun, Ellen Y.; Yamanis, Jean; Jing, Bu-Yun

doi:10.1016/j.ijhydene.2010.12.113

Cited by 58 publications

(23 citation statements)

References 16 publications

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“…The activation energies (E a ) are 102 and 96 kJ mol −1 for PBCO and PBCSc, respectively. This result matches well with other reports on the enhancement of oxygen surface exchange through partial substitution of Sc 3+ [31,32]. Figure 6 presents the current-voltage (I-V) curves and corresponding power density curves for the cathode/GDC/Ni-GDC cell using humidified H 2 and air, as a fuel and oxidant, respectively.…”

Section: Resultssupporting

confidence: 89%

“…For example, substituting constant-valence state metal ions (e.g., Nb 5+ , Ta 5+ , and Ti 4+ ) into the perovskite could increase the ionic conductivity by reducing the lattice strain that occurs during the oxygen ion transport [27][28][29][30]. Especially, in the oxygen transport membrane system, it was reported that doping scandium into the perovskite-type oxide improves the electrochemical property by lowering the activation energy for oxygen ion transfer [31,32]. In this regard, the Sc 3+ doped layered perovskite oxide is expected to exhibit a lower cathode polarization of the LT-SOFC.…”

Section: Introductionmentioning

confidence: 99%

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Scandium Doping Effect on a Layered Perovskite Cathode for Low-Temperature Solid Oxide Fuel Cells (LT-SOFCs)

et al. 2018

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Layered perovskite oxides are considered as promising cathode materials for the solid oxide fuel cell (SOFC) due to their high electronic/ionic conductivity and fast oxygen kinetics at low temperature. Many researchers have focused on further improving the electrochemical performance of the layered perovskite material by doping various metal ions into the B-site. Herein, we report that Sc3+ doping into the layered perovskite material, PrBaCo2O5+δ (PBCO), shows a positive effect of increasing electrochemical performances. We confirmed that Sc3+ doping could provide a favorable crystalline structure of layered perovskite for oxygen ion transfer in the lattice with improved Goldschmidt tolerance factor and specific free volume. Consequently, the Sc3+ doped PBCO exhibits a maximum power density of 0.73 W cm−2 at 500 °C, 1.3 times higher than that of PBCO. These results indicate that Sc3+ doping could effectively improve the electrochemical properties of the layered perovskite material, PBCO.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Scandium Doping Effect on a Layered Perovskite Cathode for Low-Temperature Solid Oxide Fuel Cells (LT-SOFCs)

et al. 2018

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“…Meanwhile, other metals coexisted in Fe−Co based perovskite oxides result in the further improvement of the catalytic activity and stability. For example, transition metal doped Fe−Co based perovskite oxides such as Ln 1‐x Sr x Co 1‐y Fe y O 3‐δ (LnSCF, Ln=La, Pr, Sm, and Gd) were found to have high electronic‐ionic mixed conductivity and high activity for the cathodic reaction in SOFC . Zhang et al .…”

Section: Introductionsupporting

confidence: 70%

“…In general, the active oxygen locating on the surface (the outermost few monolayers,∼2‐3 nm) and the lattice oxygen locating in the bulk (the following ∼4‐8 nm) are possible to be distinguished by XPS as the former one has the higher binding energy. Therefore, the lower binding energy for the O1s peaks at 528.2 eV and 528.4 eV for PSCF and PSCFN 0.1 respectively in Figure (a) were attributed to the lattice oxygen of the perovskite structure ,,. The small shift from 528.2 eV to 528.4 eV should be resulted from environmental difference of the O atoms.…”

Section: Resultsmentioning

confidence: 99%

Characterization of B‐Site Niobium‐Doped Pr_0.4Sr_0.6 (Co_0.3Fe_0.6)_1‐xNb_xO_3‐δ (x=0, 0.05, 0.1, 0.2) Perovskites as Cathode Materials for Solid Oxide Fuel Cells

Xiaokaiti

Yoshida

et al. 2018

ChemistrySelect

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Perovskite materials of Pr0.4Sr0.6(Co0.3Fe0.6)1‐xNbxO3‐δ (PSCFNx, x=0, 0.05, 0.1, 0.2) were firstly synthesized as the cathode materials for solid oxide fuel cells (SOFCs) by doping niobium(Nb) at the B site of Pr0.4Sr0.6Co0.3Fe0.6O3‐δ using a solid state reaction method. The effect of Nb doping amount on the lattice structure, oxygen desorption and electrochemical properties of PSCFNx at different calcination temperatures were investigated. It is found that this material family had perfectly cubic structure based on the Pm‐3 m space group whose lattice size increased with x. These materials were thermally stable after calcination and showed desirable chemical compatibility with electrolyte in the condition of calcination at 1250 °C for 8 h under an air atmosphere. The optimum x value of 0.1 was found for the PSCFNx cathode materials, which had the minimum polarization resistance value of 0.018 Ωcm2 at 900 °C. As a result, the single cell with the PSCFN0.1 cathode delivered a power density of 0.731 Wcm−2 at 900 °C with humidified H2 (∼3% H2O) as the fuel and ambient air as the oxidant. It indicates that PSCFN0.1 should be a promising cathode material for the SOFCs.

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“…Recently, it was claimed that Sc‐doping at the B site of SrCoO 3 oxides stabilized the cubic structure, even at low temperatures . Additionally, introduction of Sc 3+ at the B site of the cobalt‐based perovskite oxides may improve the catalytic and oxygen ion diffusion properties because of its stable +3 valences, large ionic radius, and high polarizability …”

mentioning

confidence: 99%

A Highly Active Perovskite Cathode for Low‐Temperature Solid Oxide Fuel Cells: BaCo_0.7Fe_0.22Sc_0.08O_3–_δ

Dong

et al. 2017

Advanced Sustainable Systems

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Low‐temperature solid oxide fuel cells (LT‐SOFCs) have attracted much attention for their long‐term stability, short start‐up time, and economic competitiveness. Development of a high electrochemical active cathode for the oxygen reduction reaction (ORR) is the key to LT‐SOFCs. In this study, a cubic perovskite BaCo0.7Fe0.22Sc0.08O3–δ (BCFSc) is synthesized and investigated. It exhibits extremely low polarization resistances (e.g., 0.03 Ω cm2 at 600 °C) in symmetric cell using Ce0.8Sm0.2O1.9 (SDC) as the electrolyte, indicating an excellent ORR catalytic activity. A maximum output power density of 1446 mW cm−2 is achieved at 600 °C for a single cell with an anode functional layer, which is much larger than the one without it (1045 mW cm−2). The favorable performance enables BCFSc to be a candidate cathode for LT‐SOFCs.

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Investigation on thermal, electrical, and electrochemical properties of scandium-doped Pr0.6Sr0.4(Co0.2Fe0.8)(1−x)ScxO3−δ as cathode for IT-SOFC

Cited by 58 publications

References 16 publications

Scandium Doping Effect on a Layered Perovskite Cathode for Low-Temperature Solid Oxide Fuel Cells (LT-SOFCs)

Scandium Doping Effect on a Layered Perovskite Cathode for Low-Temperature Solid Oxide Fuel Cells (LT-SOFCs)

Characterization of B‐Site Niobium‐Doped Pr_0.4Sr_0.6 (Co_0.3Fe_0.6)_1‐xNb_xO_3‐δ (x=0, 0.05, 0.1, 0.2) Perovskites as Cathode Materials for Solid Oxide Fuel Cells

A Highly Active Perovskite Cathode for Low‐Temperature Solid Oxide Fuel Cells: BaCo_0.7Fe_0.22Sc_0.08O_3–_δ

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Investigation on thermal, electrical, and electrochemical properties of scandium-doped Pr0.6Sr0.4(Co0.2Fe0.8)(1−x)ScxO3−δ as cathode for IT-SOFC

Cited by 58 publications

References 16 publications

Scandium Doping Effect on a Layered Perovskite Cathode for Low-Temperature Solid Oxide Fuel Cells (LT-SOFCs)

Scandium Doping Effect on a Layered Perovskite Cathode for Low-Temperature Solid Oxide Fuel Cells (LT-SOFCs)

Characterization of B‐Site Niobium‐Doped Pr0.4Sr0.6 (Co0.3Fe0.6)1‐xNbxO3‐δ (x=0, 0.05, 0.1, 0.2) Perovskites as Cathode Materials for Solid Oxide Fuel Cells

A Highly Active Perovskite Cathode for Low‐Temperature Solid Oxide Fuel Cells: BaCo0.7Fe0.22Sc0.08O3–δ

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Characterization of B‐Site Niobium‐Doped Pr_0.4Sr_0.6 (Co_0.3Fe_0.6)_1‐xNb_xO_3‐δ (x=0, 0.05, 0.1, 0.2) Perovskites as Cathode Materials for Solid Oxide Fuel Cells

A Highly Active Perovskite Cathode for Low‐Temperature Solid Oxide Fuel Cells: BaCo_0.7Fe_0.22Sc_0.08O_3–_δ