Influence of Ag on Chemical and Thermal Compatibility of LSCF-SDCC for LT-SOFC

Agun, Linda; Bakar, Muhamad Subri Abu; Ahmad, Sufizar; Muchtar, Andanastuti; Rahman, Hamidah Abdul

doi:10.4028/www.scientific.net/amm.773-774.445

Cited by 5 publications

(8 citation statements)

References 11 publications

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“…BSCF-SDCc-M1 had the lowest expansion with 2.10×10 −6 K −1 followed by M2 and M3 with 2.34×10 −6 K −1 and 2.70×10 −6 K −1 , respectively. This result showed that the difference between SDCc and BSCF-SDCc was <7×10 −6 K −1 [8,12]. The small thermal expansion can reduce the internal stress between the cathode and electrolyte during cell operations.…”

Section: Resultsmentioning

confidence: 92%

“…Pure BSCF maintained a good adhesion to the electrolyte even after sintering and unixial pressing [13]. Sintering at 600 °C at 90 min was appropriate and satisfied the criteria as porous LT-SOFC cathode cells [8] when the porosity was 20%-40% [4].…”

Section: Resultsmentioning

confidence: 99%

“…SDCc electrolyte pellets were combination of Li/Na carbonate (20 wt.%), various carbonate molar ratios (67:33, 62:38, and 53:47), and mixed together with 80 wt.% SDC. BSCF-SDCc composite-cathode pellets were prepared by high energy ball milling method (HEBM) similar with previously studied method [8]. The preparation for BSCFcomposite-cathode pellets was elaborated and similar with our previous study [4,9].…”

Section: Methodsmentioning

confidence: 99%

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Ba0.5Sr0.5Co0.8Fe0.2-SDC Carbonate Composite Cathode for Low-Temperature SOFCs

Agun

Shah

Ahmad

et al. 2016

MSF

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The composite cathode Ba0.5Sr0.5Co0.8Fe0.2 (BSCF)–samarium-doped ceria carbonate (SDCc) was reviewed based on different (Li/Na)2 carbonate molarities (67:33, 62:38, and 53:47 (mol.%)). Effects of (Li/Na)2 carbonate on BSCF was studied in terms of chemical, thermal, and physical properties. Composite-cathode powders were prepared using high-energy ball milling (HEBM) and calcined at 750 °C for 2 h before uniaxial pressing to form a pellets. Afterwards, the pellets were sintered at 600 °C for 90 min to obtain porous composite-cathode pellets. Powders behaviors were examined based on particle size and thermal expansion by using Image J software, field-emission scanning electron microscopy (FESEM) and dilatometry respectively. Cross-section morphology of the pellets were characterised by FESEM to examine grain positions and by the Archimedes principle to identify the porosity, respectively. The quantitative elements for the BSCF-SDCc pellet were identified using energy-dispersive spectroscopy (EDS). HEBM enabled the cathode to achieve a nanocomposite state. Cathode cells obtained became porous when porosity values were between 26% and 30%. These results showed that BSCF–SDCc has high potential for low-temperature solid oxide fuel cell (LT-SOFC) applications.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Ba0.5Sr0.5Co0.8Fe0.2-SDC Carbonate Composite Cathode for Low-Temperature SOFCs

Agun

Shah

Ahmad

et al. 2016

MSF

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“…The average TEC values from 30 o C -900 o C for all BSCF composite cathode were not within the acceptable range as owing to decomposition of BSCF at after 800 o C as mentioned in TGA discussion. Ag had been reported having capability to lower down the TEC of cathode composite [15][16]. Higher the amount of Ag added, lower the TEC was obtained.…”

Section: Methodsmentioning

confidence: 99%

Structure and Thermal Behaviour of BSCF-SDC-Ag Composite Cathode for Solid Oxide Fuel Cell

Yusop,

Tan,

Rahman

2019

IJEAT

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Solid oxide fuel cell (SOFC) component has always under development to enhance catalytic activity. Components such as anode, cathode and electrolyte must have better structure and behavior for good SOFC performance. Traditional Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) cathode in solid oxide fuel cell application has been deterred several inappropriate circumstances such as high thermal expansion coefficient (TEC) and chemical instability. Sm0.2Ce0.8O1.9 (SDC) electrolyte and Silver (Ag) are added into BSCF to overcome the problem and has better material characterization and thermal stability, The composite cathode powder BSCF-SDC was prepared by high speed ball milling technique with mixture of 50wt% BSCF and 50wt% SDC commercial powder. The powders were then dried and calcined at 950oC for 2 hour. Silver (Ag) with 1wt%, 3wt% and 5wt% were milled respectively with BSCF-SDC by low speed ball milling technique. The developed composite cathode was then examined by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), dilatometer and Thermogravimetric Analysis (TGA). The vivid distinct phase of BSCF, SDC and Ag and absence of additional secondary phase was confirmed by XRD analysis indicating good phase structure compatibility. This also assured that less chemical reaction was happened during low speed milling process for BSCF-SDC-Ag as minor secondary phases are detected. However, milling process at high speed and high calcination temperature did destruct single phase of BSCF in BSCF-SDC composite cathode. However, Ag obtains its role to retain back the BSCF crystalline phase. The higher the percent of Ag added, the higher the BSCF peak retain. The absence of addition bonding in FTIR analysis demonstrating excellent structure compatibility of BSCF, SDC and Ag during milling process. There was no significant additional bonding appeared in BSCF-SDC-Ag after milling process. The thermal expansion coefficient (TEC) were determined using dilatometer, manifesting closer TEC mismatch between BSCF-SDC-Ag cathode composite and SDC electrolyte compared to BSCF-SDC. TEC is essential to be matched as it could prevent spallation during elevated operation temperature of SOFC. TGA analysis indicated cathode composite experiencing very less changes of weight when it was heated up 1000oC. BSCF is revealed of decomposition occurring after 800oC. Result revealed that Ag exhibited desirable thermal and structure compatibility with BSCF-SDC as promising SOFC cathode which beneficial from medium scale automobile to high scale power plant application.

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“…A previous conductivity study proved that addition of argentum (Ag) to SOFC cathodes increases the electrical conductivity of the latter. Several cathode materials with Ag addition was developed such as LSCF-Ag and LSCF-SDC-Ag [9][10]. In this study, the electrochemical stability of cathode material at low temperatures (400°C -600°C) has never been studied and it is a concern.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Performance of Barium Strontium Cobalt Ferrite -Samarium Doped Ceria- Argentum for Low Temperature Solid Oxide Fuel Cell

Yusop

Huai

Rahman

et al. 2020

MSF

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A low operating temperature is one of the concerns in commercialising solid oxide fuel cells (SOFCs) as a portable power source. The aim of this research is to develop a new cathode material, barium strontium cobalt ferrite–samarium doped ceria (BSCF-SDC) added with argentum (Ag) for low-temperature SOFCs (LT-SOFCs). The composite powder was prepared through high-energy ball milling at 550 rpm for 2 h with a BSCF:SDC powder ratio of 50:50. The composite powder was calcined at 950 °C for 2 h and then mixed with Ag (1wt%, 3wt% and 5wt%) via dry milling at 150 rpm. The phase stability of the resulting samples was examined by X-ray diffractometry, and powder particle sizes were determined by using a Zeta-Sizer Nano ZS. The thermal stability of each sample was determined on the basis of thermal expansion coefficients (TECs), and electrochemical characteristics were determined through electrochemical impedance spectroscopy to investigate the performance of BSCF-SDC-Ag in LT-SOFCs (400–600 °C). Phase analysis demonstrated no impurity phases existed. Particle size analysis revealed that increment in Ag content affect the particle size of BSCF-SDCC. TEC analysis demonstrated that BSCF-SDC-Ag1% has a mismatch value of 16.39%, which is within the acceptable TEC range of 15%–20%. BSCF-SDC-Ag1% showed a maximum conductivity of 39.37Scm-1 at 600 °C.

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Influence of Ag on Chemical and Thermal Compatibility of LSCF-SDCC for LT-SOFC

Cited by 5 publications

References 11 publications

Ba<sub>0</sub>.<sub>5</sub>Sr<sub>0</sub>.<sub>5</sub>Co<sub>0</sub>.<sub>8</sub>Fe<sub>0</sub>.<sub>2</sub>-SDC Carbonate Composite Cathode for Low-Temperature SOFCs

Ba<sub>0</sub>.<sub>5</sub>Sr<sub>0</sub>.<sub>5</sub>Co<sub>0</sub>.<sub>8</sub>Fe<sub>0</sub>.<sub>2</sub>-SDC Carbonate Composite Cathode for Low-Temperature SOFCs

Structure and Thermal Behaviour of BSCF-SDC-Ag Composite Cathode for Solid Oxide Fuel Cell

Electrochemical Performance of Barium Strontium Cobalt Ferrite -Samarium Doped Ceria- Argentum for Low Temperature Solid Oxide Fuel Cell

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