Ceria interlayer-free Ba0.5Sr0.5Co0.8Fe0.2O3−δ–Sc0.1Zr0.9O1.95 composite cathode on zirconia based electrolyte for intermediate temperature solid oxide fuel cells

Lee, Seong Oh; Lee, Daehee; Jung, In-Yong; Kim, Dongha; Hyun, Seungjoon; Kim, Joosun; Moon, Jooho

doi:10.1016/j.ijhydene.2013.05.048

Cited by 17 publications

(11 citation statements)

References 41 publications

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“…These measurements have been performed using point electrodes [5,6,15,18,[52][53][54], porous electrodes in a symmetrical cell [55][56][57][58][59], or three-electrode setup [60][61][62].…”

Section: Introductionmentioning

confidence: 99%

Composite cathode materials Ag-Ba0.5Sr0.5Co0.8Fe0.2O3 for solid oxide fuel cells

Mosiałek

Dudek

Michna

et al. 2014

J Solid State Electrochem

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Silver-Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) cathodes were prepared in two ways. In the first method, Ag-BSCF composite powder was prepared in ethanol solution, where Ag nanoparticles serving as a component in the preparation of Ag-BSCF composite cathodes had been previously obtained via one-step synthesis in absolute ethanol using a neutral polymer (polyvinylpyrrolidone). To the best of our knowledge, this is the first study to use a Ag sol obtained by the above method for preparation of Ag-BSCF composite powder. Then, a paste containing this powder was screen-printed on a Sm 0.2 Ce 0.8 O 1.9 electrolyte and sintered at 1,000°C. In the second technique, an aqueous solution of AgNO 3 was added to a previously sintered BSCF cathode, which was then sintered again at 800°C. The oxygen reduction reaction at the quasi-point BSCF cathode on the Sm 0.2 Ce 0.8 O 1.9 electrolyte was tested by electrochemical impedance spectroscopy at different oxygen concentrations in three electrode setup. The continuous decrease of polarization resistance was observed under polarization −0.5 V at 600°C. The comparative studies of both obtained composite Ag-BSCF materials were performed in hydrogen-oxygen IT-SOFC involving samariadoped ceria as an electrolyte and Ni-Gd 0.2 Ce 0.8 O 1.9 anode. In both cases, the addition of silver to the cathode caused an increase in current and power density compared with an IT-SOFC built with the same components but involving a monophase BSFC cathode material.

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“…These measurements have been performed using point electrodes [5,6,15,18,[52][53][54], porous electrodes in a symmetrical cell [55][56][57][58][59], or three-electrode setup [60][61][62].…”

Section: Introductionmentioning

confidence: 99%

Composite cathode materials Ag-Ba0.5Sr0.5Co0.8Fe0.2O3 for solid oxide fuel cells

Mosiałek

Dudek

Michna

et al. 2014

J Solid State Electrochem

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“…Crumlin et al report a study of La 0.8 Sr 0.2 CoO 3−δ film where surface chemistry changes are investigated [9]. Similar studies related to SOFC cathodes can be found in the literature investigating different aspects of material processing and chemical properties [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 72%

XPS Studies of LSCF Interfaces after Cell Testing

DiGiuseppe

Boddapati

Mothikhana

2018

Advances in Materials Science and Engineering

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e motivation of this investigation is to explore the possibility of using the depth profile capability of XPS to study interfaces after SOFC button cell testing. e literature uses XPS to study various cathode materials but has devoted little to the understanding of various cathode interfaces especially after testing. In this work, an SOFC button cell is first tested, and then, the LSCF cathode, barrier layer, and electrolyte are sputtered away to study the behavior of different interfaces. is work has shown that some elements have moved into other layers of the SOFC cell. It is argued that the migration of the elements is partly due to a redeposition mechanism after atoms are sputtered away, while the rest is due to interdiffusion between the SDC and YSZ layers. However, additional work is needed to better understand the mechanism by which atoms move around at different interfaces. e cell electrochemical performance is also discussed in some details but is not the focus.

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“…For example, Ba 3d corresponds to only one contribution and the Ba 3d 5/2 peak shows a maximum at ~780 eV . The Sr 3d spectrum matches with a doublet state due to spin‐orbit coupling of 3d 5/2 and 3d 3/2 and corresponding binding energies (BE) in perovskite‐type cubic oxide due to Sr 2+ state are ~132 and ~ 133 eV for the 3d 5/2 and 3d 3/2 peaks, respectively . The spectrum of Gd can be seen in the composites which has a contribution in the range 130‐180 eV.…”

Section: Resultsmentioning

confidence: 95%

“…It can be fitted by two Gaussian peaks at ~528 and ~530 eV (say; for x =0). The higher binding energy (HBE) component can be attributed to A–O bonds which might be associated with adsorbed oxygen mainly in the form of weakly bound oxygen on the surface, whereas lower binding energy (LBE) component with FWHM ~1.1 eV correspond to O—(Ce/Zr/Y) bonds in cubic structure sometimes assigned to lattice oxygen . In Figure, we can clearly examine that the area fraction of HBE and LBE peaks decrease and increase, respectively, with “x” in composite electrolytes.…”

Section: Resultsmentioning

confidence: 95%

Synthesis and conductivity behaviour of proton conducting (1−x)Ba_0.6Sr_0.4Ce_0.75Zr_0.10Y_0.15O_3−δ‐xGDC (x=0, 0.2, 0.5) composite electrolytes

et al. 2017

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An attempt has been made here to synthesize (1Àx)Ba 0.6 Sr 0.4 CZY-xGDC (x=0, 0.2, 0.5) composite electrolytes and investigated their phase(s), X-ray photo spectra (XPS) and conduction properties. All compositions possess dual phases (perovskite-type as well as cubic fluorite structure) and show proton conduction in various atmospheres. Homogeneous formation and compatibility between phases have been confirmed from X-ray diffraction analysis. Detailed X-ray photoelectron spectroscopy (XPS) studies on the oxidation states of barium, strontium, gadolinium, cerium, zirconium, yttrium, and oxygen was performed. With increasing "x", oxygen vacancy concentration increases as cerium ions in 4+ oxidation state decreases. The conduction behavior of composites depicts the protonic in nature and total activation energy lying in the range of 0.16-0.24 eV. This study indicates that the conductivity increases with GDC content in composite electrolytes and highest conductivity is found for composite with x=0.5. These characteristics are useful to make (1Àx)Ba 0.6 Sr 0.4 CZY-xGDC composite electrolytes as promising candidate of central membrane for advanced fuel cell technology. K E Y W O R D Soxides, proton conductor, sol-gel synthesis, solid electrolyte, X-ray photoelectron spectroscopy

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Ceria interlayer-free Ba0.5Sr0.5Co0.8Fe0.2O3−δ–Sc0.1Zr0.9O1.95 composite cathode on zirconia based electrolyte for intermediate temperature solid oxide fuel cells

Cited by 17 publications

References 41 publications

Composite cathode materials Ag-Ba0.5Sr0.5Co0.8Fe0.2O3 for solid oxide fuel cells

Composite cathode materials Ag-Ba0.5Sr0.5Co0.8Fe0.2O3 for solid oxide fuel cells

XPS Studies of LSCF Interfaces after Cell Testing

Synthesis and conductivity behaviour of proton conducting (1−x)Ba_0.6Sr_0.4Ce_0.75Zr_0.10Y_0.15O_3−δ‐xGDC (x=0, 0.2, 0.5) composite electrolytes

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Ceria interlayer-free Ba0.5Sr0.5Co0.8Fe0.2O3−δ–Sc0.1Zr0.9O1.95 composite cathode on zirconia based electrolyte for intermediate temperature solid oxide fuel cells

Cited by 17 publications

References 41 publications

Composite cathode materials Ag-Ba0.5Sr0.5Co0.8Fe0.2O3 for solid oxide fuel cells

Composite cathode materials Ag-Ba0.5Sr0.5Co0.8Fe0.2O3 for solid oxide fuel cells

XPS Studies of LSCF Interfaces after Cell Testing

Synthesis and conductivity behaviour of proton conducting (1−x)Ba0.6Sr0.4Ce0.75Zr0.10Y0.15O3−δ‐xGDC (x=0, 0.2, 0.5) composite electrolytes

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Synthesis and conductivity behaviour of proton conducting (1−x)Ba_0.6Sr_0.4Ce_0.75Zr_0.10Y_0.15O_3−δ‐xGDC (x=0, 0.2, 0.5) composite electrolytes