Synthesis and Characterization of Y2Ru2O7 and Y2-XPrXRu2O7 for Cathode Application in Intermediate Temperature Solid Oxide Fuel Cells

Abate, Chiara; Duncan, Keith L.; Esposito, Vincenzo; Traversa, Enrico; Wachsman, Eric D.

doi:10.1149/1.2215560

Cited by 6 publications

(4 citation statements)

References 10 publications

(11 reference statements)

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“…18 The low resistance ͑3.47 and 0.08 ⍀ cm 2 at 500 and 700°C, respectively͒ of this composite may be attributable in part to the high ionic conductivity of the ESB20 phase. In addition, ruthenium oxides are known to be catalytically active, 19,20 and by selection of a sufficiently large A-site dopant cation in ͑A 2 Ru 2 O 7 ͒, such as Pb or Bi, its band structure is altered in such a way as to render its behavior metallic, with conductivity increasing as temperature decreases. 21 For this study, bismuth was chosen as the A-site dopant, as it is the same as the host cation of the ESB20 phase and should improve chemical compatibility.…”

Section: ••mentioning

confidence: 99%

High-Performance Composite Bi[sub 2]Ru[sub 2]O[sub 7]–Bi[sub 1.6]Er[sub 0.4]O[sub 3] Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells

Camaratta

Wachsman

2008

J. Electrochem. Soc.

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Porous composite electrodes consisting of normalBi2normalRu2normalO7 (BRO7) and normalEr0.4normalBi1.6normalO3 (ESB20) were synthesized and characterized using impedance spectroscopy on symmetrical cells. Electrode performance was manipulated compositionally by varying the weight percent of each phase in the composite. Microstructural influences on electrode resistance were examined by varying starting particle sizes of BRO7 and ESB20 powders and using a combination of sedimentation to further reduce particle size and size distributions as well as ultrasonication to break up soft agglomerates. The effect of electrode thickness was also studied by applying successive coats of the electrode inks to the electrolyte substrates. In addition, application of a pure BRO7 current collector was found to dramatically improve performance. Using these optimization techniques, a minimum electrode area specific resistance of 0.03Ωcm2 was attained at 700°C .

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Section: ••mentioning

confidence: 99%

High-Performance Composite Bi[sub 2]Ru[sub 2]O[sub 7]–Bi[sub 1.6]Er[sub 0.4]O[sub 3] Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells

Camaratta

Wachsman

2008

J. Electrochem. Soc.

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“…Accordingly, trivalent yttrium ions can be considered as A-site cations of the pyrochlore oxide because of the similar ionic radius with that of divalent lead or trivalent bismuth ions . On the basis of the Mott–Hubbard mechanism, the electrical behavior of the pyrochlore oxide is determined by the Ru–O–Ru bond angle, which corresponds with the size of A-site cations. , In this regard, the development of yttrium ruthenate (Y 2 [Ru 2– x Y x ]O 7– y ) as a new electrocatalyst is needed for an extensive understanding of pyrochlore structure.…”

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confidence: 99%

“…25 On the basis of the Mott−Hubbard mechanism, the electrical behavior of the pyrochlore oxide is determined by the Ru−O−Ru bond angle, which corresponds with the size of A-site cations. 26,27 In this regard, the development of yttrium ruthenate (Y 2 [Ru 2−x Y x ]O 7−y ) as a new electrocatalyst is needed for an extensive understanding of pyrochlore structure.…”

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confidence: 99%

Unveiling the Catalytic Origin of Nanocrystalline Yttrium Ruthenate Pyrochlore as a Bifunctional Electrocatalyst for Zn–Air Batteries

Park

Nam

et al. 2017

Nano Lett.

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Zn-air batteries suffer from the slow kinetics of oxygen reduction reaction (ORR) and/or oxygen evolution reaction (OER). Thus, the bifunctional electrocatalysts are required for the practical application of rechargeable Zn-air batteries. In terms of the catalytic activity and structural stability, pyrochlore oxides (A[BA]O) have emerged as promising candidates. However, a limited use of A-site cations (e.g., lead or bismuth cations) of reported pyrochlore catalysts have hampered broad understanding of their catalytic effect and structure. More seriously, the catalytic origin of the pyrochlore structure was not clearly revealed yet. Here, we report the new nanocrystalline yttrium ruthenate (Y[RuY]O) with pyrochlore structure. The prepared pyrochlore oxide demonstrates comparable catalytic activities in both ORR and OER, compared to that of previously reported metal oxide-based catalysts such as perovskite oxides. Notably, we first find that the catalytic activity of the Y[RuY]O is associated with the oxidations and corresponding changes of geometric local structures of yttrium and ruthenium ions during electrocatalysis, which were investigated by in situ X-ray absorption spectroscopy (XAS) in real-time. Zn-air batteries using the prepared pyrochlore oxide achieve highly enhanced charge and discharge performance with a stable potential retention for 200 cycles.

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“…However, several ruthenate compounds and noble metals showed their reliability and long-term stability as cathodes on ESB. 13,30,31 In the case of BIMEVOX, the electrode composition still represents an unsolved problem because of their tendency to react 32 and alloy with most cathode materials, including noble metals. Boukamp observed that Au and Pt electrodes on BICUVOX modify their morphology, while sputtered Ag electrodes disappear completely after the electrochemical test in oxygen redox conditions.…”

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confidence: 99%

Applicability of Bi[sub 2]Ru[sub 2]O[sub 7] Pyrochlore Electrodes for ESB and BIMEVOX Electrolytes

Esposito

Luong

Bartolomeo

et al. 2006

J. Electrochem. Soc.

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Bismuth ruthenate pyrochlore ͑Bi 2 Ru 2 O 7 :BRO͒ was tested as a cathode in several bismuth oxide-based electrolyte cells. Erbium oxide stabilized bismuth oxide ͑ESB͒ ͑Bi 2 O 3 ͒ 0.8 ͑Er 2 O 3 ͒ 0.2 , Bi 2 V 0.9 Me 0.1 O 5.35 ͑BIMEVOX10, Me = Co, Cu, Zn͒, and Bi 2 Ru 2 O 7 ͑BRO͒ were synthesized via solid-state reaction. ESB and BIMEVOX powders were pressed and sintered into dense pellets while BRO was deposited and sintered as porous electrodes onto ESB and BIMEVOX dense pellet surfaces. Morphologies and phases of the materials were characterized by field emission scanning electron microscope and X-ray diffraction, respectively. Electrochemical performances of BRO/ESB and BRO/BIMEVOX symmetric cells were tested using electrochemical impedance spectroscopy at 200-700°C in air. High polarization for BRO/BIMEVOX cells was observed. In contrast, BRO/ESB cells showed promising low polarization behavior. Different electrochemical performances of BRO electrodes, with ESB or BIMEVOX, indicated that the phases formed at the electrode/electrolyte interface dominated the cell polarization process for BRO/BIMEVOX cells.

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Synthesis and Characterization of Y2Ru2O7 and Y2-XPrXRu2O7 for Cathode Application in Intermediate Temperature Solid Oxide Fuel Cells

Cited by 6 publications

References 10 publications

High-Performance Composite Bi[sub 2]Ru[sub 2]O[sub 7]–Bi[sub 1.6]Er[sub 0.4]O[sub 3] Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells

High-Performance Composite Bi[sub 2]Ru[sub 2]O[sub 7]–Bi[sub 1.6]Er[sub 0.4]O[sub 3] Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells

Unveiling the Catalytic Origin of Nanocrystalline Yttrium Ruthenate Pyrochlore as a Bifunctional Electrocatalyst for Zn–Air Batteries

Applicability of Bi[sub 2]Ru[sub 2]O[sub 7] Pyrochlore Electrodes for ESB and BIMEVOX Electrolytes

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