Development of micro-tubular SOFCs with an improved performance via nano-Ag impregnation for intermediate temperature operation

Liu, Yu; Mori, M.; Funahashi, Yoshihiro; Fujishiro, Yoshinobu; Hirano, Atsushi

doi:10.1016/j.elecom.2007.05.003

Cited by 57 publications

(34 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Composite cathodes with silver and ionic conductor material are characterized by good performance [17,[20][21][22][23][24][25][26][27]. Many composites containing silver and oxide cathode material, such as LSCF, LSM, SSC, La 1.6 Sr 0.4 NiO 4 , and BSCF, exhibit better electrochemical performance than the same materials without silver [13,16,[28][29][30][31][32][33][34][35][36][37][38][39]. Moreover, silver is used in current collectors and as a sealant [40,41].…”

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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…Nevertheless, the dispersion of metal is hard to control. Usually, ethylene glycol and citric acid are used, the so called complex-polymerization method [34] and a multitude of repeated infiltration step is required in order to fill enough metal into LSCF backbone. However, due to the low specific surface area typical of perovskites and due to the sintering effects during the calcination process, metal particles tend to agglomerate, affecting the catalytic property and also leading to LSCF pore clogging [7,34].…”

Section: Lscf Surface Modificationmentioning

confidence: 99%

“…The presence of metal clusters at the LSCF surface will enlarge TPB by enlarging the electrode surface area directly [34,37,55]. However, the main contribution to ORR is the catalytic effect on oxygen adsorption-dissociation.…”

Section: Effects On Lscf Surface Promotedmentioning

confidence: 99%

“…Experiments have been carried out on noble metals, such as Pd [31][32][33], Ag [34][35][36][37][38][39], Pt [38][39][40][41] and as well on low-cost transition metals, Cu [38,39,42] Zn and Ni [43]. Although the specific mechanism of metal promotion is still under investigation, previous studies have shown that metal promotion promotes the oxygen electro-catalytic reduction and influences the TEC value, implying great prospective for such materials as IT-SOFC cathodes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

B-Site Metal (Pd, Pt, Ag, Cu, Zn, Ni) Promoted La1−xSrxCo1−yFeyO3–δ Perovskite Oxides as Cathodes for IT-SOFCs

Guo

Puleo

et al. 2015

Catalysts

View full text Add to dashboard Cite

Perovskite oxides La1−xSrxCo1−yFeyO3-δ (LSCF) have been extensively investigated and developed as cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs) due to mixed ionic-electronic conductivity and high electrooxygen reduction activity for oxygen reduction. Recent literature investigations show that cathode performances can be improved by metal surface modification or B-site substitution on LSCF. Although the specific reaction mechanism needs to be further investigated, the promoting effect of metal species in enhancing oxygen surface exchange and oxygen bulk diffusion is well recognized. To our knowledge, no previous reviews dealing with the effect of metal promotion on the cathodic performances of LSCF materials have been reported. In the present review, recent progresses on metal (Pd, Pt, Ag, Cu, Zn, Ni) promotion of LSCF are discussed focusing on two main aspects, the different synthesis approaches used (infiltration, deposition, solid state reaction, one pot citrate method) and the effects of metal promotion on structural properties, oxygen vacancies content and cathodic performances. The novelty of the work lies in the fact that the metal promotion at the B-site is discussed in detail, pointing at the effects produced by two different approaches, the LSCF surface modification by the metal or the metal ion substitution at the B-site of the perovskite. Moreover, for the first time in a review article, the importance of the combined effects of oxygen dissociation rate and interfacial oxygen transfer rate between the metal phase and the cathode phase is addressed for OPEN ACCESSCatalysts 2015, 5 367 metal-promoted LSCF and compared with the un-promoted oxides. Perspectives on new research directions are shortly given in the conclusion.

show abstract

“…Several composite materials containing silver and oxide cathode material, such as La 0.6 Sr 0. 4 , exhibit much better electrochemical performance than pure oxide material [2][3][4][5][6][7][8][9][10][11][12]. Silver is also used for the construction of current collectors and as a sealant.…”

Section: Introductionmentioning

confidence: 99%

Silver migration at the Ag|Sm0.2Ce0.8O1.9 interface

Dudek

Mosiałek

Nowak

et al. 2014

J Solid State Electrochem

View full text Add to dashboard Cite

The behavior of a silver electrode contacting Ce 0.8 Sm 0.2 O 1.9 (samaria-doped ceria or SDC) electrolyte under external cathodic polarization in the temperature range 350-700°C was examined by means of long-term polarization experiments, scanning electron microscopy, and electrochemical impedance spectroscopy. A silver deposit is formed around the silver cathode via a surface migration mechanism without the occurrence of the gas-phase transport phenomenon during polarization. This results in an increase in both the electrode-electrolyte contact area and the triple-phase boundary length, which in turn causes decreases in charge transfer resistance and electrolyte resistance.

show abstract

Development of micro-tubular SOFCs with an improved performance via nano-Ag impregnation for intermediate temperature operation

Cited by 57 publications

References 12 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

B-Site Metal (Pd, Pt, Ag, Cu, Zn, Ni) Promoted La1−xSrxCo1−yFeyO3–δ Perovskite Oxides as Cathodes for IT-SOFCs

Silver migration at the Ag|Sm0.2Ce0.8O1.9 interface

Contact Info

Product

Resources

About