Improved phase stability and electrochemical performance of (Y,In,Ca)BaCo 3 ZnO 7+δ cathodes for intermediate temperature solid oxide fuel cells

West, Matthew; Manthiram, Arumugam

doi:10.1016/j.ijhydene.2014.09.091

Cited by 10 publications

(4 citation statements)

References 32 publications

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“…Our group has further investigated the long-term stability of Zn-substituted RBaCo 4 O 7+δ materials by annealing the samples at 600–800 °C for up to 120 h, and the electrochemical performance of the stabilized compositions was measured as cathode materials in SOFCs. ,− Although Hao et al did not observe any weight gain in the TGA results of YBaCo 3 ZnO 7+δ above 600 °C, our group found that YBaCo 3 ZnO 7+δ decomposed after the long-term stability tests at 600 and 700 °C. Our previous work also revealed that high-temperature phase stability could be achieved by applying partial substitutions at the R site (e.g., In or In–Ca) of YBaCo 3 ZnO 7+δ .…”

Section: Introductionmentioning

confidence: 93%

Phase Stability, Oxygen-Storage Capability, and Electrocatalytic Activity in Solid Oxide Fuel Cells of (Y, In, Ca)BaCo_4–yGa_yO_7+δ

Lai

Manthiram

2016

Chem. Mater.

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Section: Introductionmentioning

confidence: 93%

Phase Stability, Oxygen-Storage Capability, and Electrocatalytic Activity in Solid Oxide Fuel Cells of (Y, In, Ca)BaCo_4–yGa_yO_7+δ

Lai

Manthiram

2016

Chem. Mater.

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“…Cluster I-3 focuses on the composite of YBaCo 3 ZnO 7 catalysts and GDCs [58]. YBaCo 3 ZnO 7 shows favorable electrochemical performance and an excellent thermal expansion coefficient as a cathode for IT-SOFCs, although it has a tendency to decompose after long-term operation at 600-800 • C. To improve stability, the Y in YBaCo 3 ZnO 7 has been substituted by In or Ca at a non-stoichiometric ratio, otherwise the ratio of Co 3 Zn is changed with doping Gd or Al instead of Zn [58].…”

Section: Emerging Sofc Technologiesmentioning

confidence: 99%

Comprehensive Analysis of Trends and Emerging Technologies in All Types of Fuel Cells Based on a Computational Method

2018

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Fuel cells have been attracting significant attention recently as highly efficient and eco-friendly energy generators. Here, we have comprehensively reviewed all types of fuel cells using computational analysis based on a citation network that detects emerging technologies objectively and provides interdisciplinary data to compare trends. This comparison shows that the technologies of solid oxide fuel cells (SOFCs) and electrolytes in polymer electrolyte fuel cells (PEFCs) are at the mature stage, whereas those of biofuel cells (BFCs) and catalysts in PEFCs are currently garnering attention. It does not mean, however, that the challenges of SOFCs and PEFC electrolytes have been overcome. SOFCs need to be operated at lower temperatures, approximately 500 • C. Electrolytes in PEFCs still suffer from a severe decrease in proton conductivity at low relative humidity and from their high cost. Catalysts in PEFCs are becoming attractive as means to reduce the platinum catalyst cost. The emerging technologies in PEFC catalysts are mainly heteroatom-doped graphene/carbon nanotubes for metal-free catalysts and supports for iron-or cobalt-based catalysts. BFCs have also received attention for wastewater treatment and as miniaturized energy sources. Of particular interest in BFCs are membrane reactors in microbial fuel cells and membrane-less enzymatic biofuel cells.

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“…In addition to the parent phase of YBaCo 4 O 7+δ , many cation-substituted YBaCo 4 O 7+δ compounds have also been reported in the literature. For example, our group studied YBaCo 3 ZnO 7+δ , Y 0.9 In 0.1 Co 3 ZnO 7+δ , and Y 0.9 In 0.1 Co 3 Zn 0.6 Fe 0.4 O 7+δ as low TEC cathodes for SOFCs in the intermediate temperature range [15,16,[18][19][20][21]. However, the distributions of the dopants in the various crystallographic sites were not well understood as the dopants could have different preferences to stay at the 2a and 6c sites.…”

Section: Structural Analysis Of Cation-substituted Ybaco 4 Omentioning

confidence: 99%

“…Valldor et al found that YBaCo 4 O 7+δ -type oxides have a large solubility for dopants and RBaM 4 O 7+δ (R = Ca, Y, In, Dy-Lu, M = Co, Al, Zn, and Fe) could be prepared by solid-state synthesis [14]. Our group explored the substitution of In/Ca for Y ions in YBaCo 3 ZnO 7+δ as SOFC cathodes [15,16]. Vert et al reported TbBaCo 3 ZnO 7+δ to have area specific resistance of 30 mΩ cm 2 at 850 o C [17].…”

Section: Introductionmentioning

confidence: 99%

Unravelling the low thermal expansion coefficient of cation-substituted YBaCo4O7+δ

Kan

Lai

Huq

et al. 2016

Journal of Power Sources

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With an aim to understand the origin of the low thermal expansion coefficients (TECs), cation-substituted YBaCo 4 O 7-type oxides have been investigated by in-situ neutron diffraction, bond valence sum (BVS), thermogravimetic analysis, and dilatometry. The compositions YBaCo 3 ZnO 7+δ , Y 0.9 In 0.1 BaCo 3 ZnO 7+δ , and Y 0.9 In 0.1 BaCo 3 Zn 0.6 Fe 0.4 O 7+δ were synthesized by solid-state reaction at 1200 o C. Rietveld refinement of the joint synchrotron X-ray and neutron diffraction data shows that the Zn and Fe dopants have different preferences to substitute the Co ions in the 6c and 2a sites. The bulk thermal-expansion coefficient of YBaCo 3 ZnO 7+δ , Y 0.9 In 0.1 BaCo 3 ZnO 7+δ , and Y 0.9 In 0.1 BaCo 3 Zn 0.6 Fe 0.4 O 7+δ are, respectively, 9.42, 9.76, and 9.06 x 10-6 o C-1. Neutron diffraction data show that the low anisotropic TEC along the a-axis is the main contributor to the low bulk TECs. With the substitution of In, Zn, and Fe in Y 0.9 In 0.1 BaCo 3 Zn 0.6 Fe 0.4 O 7+δ , the anisotropic and bulk TECs could be reduced to 8.94 and 9.06 x 10-6 o C-1 , respectively, mainly due to the suppression of the change in CoO bond length in CoO 4 polyhedra. The observed weight loss during heating is due to the loss of interstitial oxide ions, as revealed by neutron diffraction and BVS map. Y 0.9 In 0.1 BaCo 3 Zn 0.6 Fe 0.4 O 7+δ has the lowest areaspecific cathodic polarization resistance of 0.14 ohm cm 2 (R total /2) at 700 o C in air.

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Improved phase stability and electrochemical performance of (Y,In,Ca)BaCo 3 ZnO 7+δ cathodes for intermediate temperature solid oxide fuel cells

Cited by 10 publications

References 32 publications

Phase Stability, Oxygen-Storage Capability, and Electrocatalytic Activity in Solid Oxide Fuel Cells of (Y, In, Ca)BaCo_4–yGa_yO_7+δ

Phase Stability, Oxygen-Storage Capability, and Electrocatalytic Activity in Solid Oxide Fuel Cells of (Y, In, Ca)BaCo_4–yGa_yO_7+δ

Comprehensive Analysis of Trends and Emerging Technologies in All Types of Fuel Cells Based on a Computational Method

Unravelling the low thermal expansion coefficient of cation-substituted YBaCo4O7+δ

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Improved phase stability and electrochemical performance of (Y,In,Ca)BaCo 3 ZnO 7+δ cathodes for intermediate temperature solid oxide fuel cells

Cited by 10 publications

References 32 publications

Phase Stability, Oxygen-Storage Capability, and Electrocatalytic Activity in Solid Oxide Fuel Cells of (Y, In, Ca)BaCo4–yGayO7+δ

Phase Stability, Oxygen-Storage Capability, and Electrocatalytic Activity in Solid Oxide Fuel Cells of (Y, In, Ca)BaCo4–yGayO7+δ

Comprehensive Analysis of Trends and Emerging Technologies in All Types of Fuel Cells Based on a Computational Method

Unravelling the low thermal expansion coefficient of cation-substituted YBaCo4O7+δ

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Phase Stability, Oxygen-Storage Capability, and Electrocatalytic Activity in Solid Oxide Fuel Cells of (Y, In, Ca)BaCo_4–yGa_yO_7+δ

Phase Stability, Oxygen-Storage Capability, and Electrocatalytic Activity in Solid Oxide Fuel Cells of (Y, In, Ca)BaCo_4–yGa_yO_7+δ