Electrical, thermal and electrochemical properties of SmBa1−xSrxCo2O5+δ cathode materials for intermediate-temperature solid oxide fuel cells

Subardi, Adi; Chen, Ching-Cheng; Cheng, Meng-Hsien; Chang, Wei; Fu, Yen−Pei

doi:10.1016/j.electacta.2016.04.069

Cited by 38 publications

(21 citation statements)

References 48 publications

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“…The AC impedance measurement was performed using the VoltaLab PGZ301 potentiostat with a frequency applied range from 100 kHz to 0.1 Hz with 10 mV AC signal amplitude. The EIS fitting analysis was performed with the Z-view software [24]. The digital source meter (Keithley 2420) was used to collect voltage (V) -current (I) from a single cell in the temperature range between 625 °C and 675 °C.…”

Section: Materials and Methods For Preparing And Testing Specimensmentioning

confidence: 99%

“…Therefore, it is important to improve the thermal expansion compatibility between the cathodes and the electrolytes. Zhou et al [24] have declared that LnBaCo 2 O 5+δ cathodes with an intermediate lanthanide-ion radius, such as Sm 3+ , may provide a compromise between the values of the catalytic activity and thermal expansion coefficients. Recent reports exhibit when A′ site is partially substituted by Sr, it could potentially improve the conductivity of double perovskite oxides where Sr-doped oxide YBa 0.5 Sr 0.5 Co 2 O 5+δ demonstrated excellent conductivity values (about 32 times higher than that of the Sr-free sample).…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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An analysis of SmBa0.5Sr0.5Co2O5+δ double perovskite oxide for intermediate–temperature solid oxide fuel cells

Subardi

Susanto

Kartikasari

et al. 2021

EEJET

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The main obstacle to solid oxide fuel cells (SOFCs) implementation is the high operating temperature in the range of 800–1,000 °C so that it has an impact on high costs. SOFCs work at high temperatures causing rapid breakdown between layers (anode, electrolyte, and cathode) because they have different thermal expansion. The study focused on reducing the operating temperature in the medium temperature range. SmBa0.5Sr0.5Co2O5+δ (SBSC) oxide was studied as a cathode material for IT-SOFCs based on Ce0.8Sm0.2O1.9 (SDC) electrolyte. The SBSC powder was prepared using the solid-state reaction method with repeated ball-milling and calcining. Alumina grinding balls are used because they have a high hardness to crush and smooth the powder of SOFC material. The specimens were then tested as cathode material for SOFC at intermediate temperature (600–800 °C) using X-ray powder diffraction (XRD), thermogravimetric analysis (TGA), electrochemical, and scanning electron microscopy (SEM) tests. The X-ray powder diffraction (XRD) pattern of SBSC powder can be indexed to a tetragonal space group (P4/mmm). The overall change in mass of the SBSC powder is 8 % at a temperature range of 125–800 °C. A sample of SBSC powder showed a high oxygen content (5+δ) that reached 5.92 and 5.41 at temperatures of 200 °C and 800 °C, respectively. High diffusion levels and increased surface activity of oxygen reduction reactions (ORRs) can be affected by high oxygen content (5+δ). The polarization resistance (Rp) of samples sintered at 1000 °C is 4.02 Ωcm2 at 600 °C, 1.04 Ωcm2 at 700 °C, and 0.42 Ωcm2 at 800 °C. The power density of the SBSC cathode is 336.1, 387.3, and 357.4 mW/cm2 at temperatures of 625 °C, 650 °C, and 675 °C, respectively. The SBSC demonstrates as a prospective cathode material for IT-SOFC

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Section: Materials and Methods For Preparing And Testing Specimensmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

An analysis of SmBa0.5Sr0.5Co2O5+δ double perovskite oxide for intermediate–temperature solid oxide fuel cells

Subardi

Susanto

Kartikasari

et al. 2021

EEJET

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“…where M S is the molar mass of the sample, M O is the molar mass of oxygen, Dm is the sample mass change, and m is the sample mass at room temperature in air. 16 The room temperature oxygen nonstoichiometry of the calcined LBSC55 specimen was determined via iodometric titration. 17 The thermal expansion coefficient (TEC) of the LBSC55 sintered at 1100 C for 4 h was measured using a thermomechanical analyzer (TMA; Hitachi TMA7300) with a constant heating rate of 10 C min À1 in the temperature range of 25-800 C in static air.…”

Section: Introductionmentioning

confidence: 99%

Oxygen permeation, thermal expansion behavior and electrochemical properties of LaBa_0.5Sr_0.5Co₂O_5+δ cathode for SOFCs

Subardi

Liao

2017

RSC Adv.

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“…The SBC specimen shows a linear expansion in the low temperature region (100-300 o C) and a slight increase in slope at higher temperatures region (300-800 o C). At higher temperature, a part of the smaller Co 4+ were reduced to larger Co 3+ or Co 2+ with a loss of oxygen, C 3+ ions are easy to transit from low-spin to high-spin state [14,[21][22][23].…”

Section: Thermal Expansion Coefficients Of Sbcmentioning

confidence: 99%

Crystal structure, thermal expansion and long-term behaviors of SmBaCoO_5+δ as cathode for intermediate-temperature solid oxide fuel cells

Subardi¹,

2018

MATEC Web Conf.

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SmBaCo2O5+δ (SBC) was studied as cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The crystal structure, thermal expansion behavior, and electrochemical performance with long-term operation of SBC were characterized. An orthorhombic layered perovskite structure was observed in SBC cathode by a GSAS program for refinement. The average thermal expansion coefficient (TEC) is 21.6 x 10-6K-1 in the temperature range of 100oC-800oC. For long-term testing, the polarization resistance of SBC cathode increases gradually from 25.77 Ω cm2 for 2 h to 38.77 Ω cm2 for 96 h at 600°C, and an increasing-rate for polarization resistance is around 13,8% h-1. Based on the electrochemical properties, SBC cathode with mixed ionic and electronic conductor (MIEC) behavior is a potential cathode for intermediate temperature solid oxide fuel cells based on a SDC electrolyte.

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Electrical, thermal and electrochemical properties of SmBa1−xSrxCo2O5+δ cathode materials for intermediate-temperature solid oxide fuel cells

Cited by 38 publications

References 48 publications

An analysis of SmBa0.5Sr0.5Co2O5+δ double perovskite oxide for intermediate–temperature solid oxide fuel cells

An analysis of SmBa0.5Sr0.5Co2O5+δ double perovskite oxide for intermediate–temperature solid oxide fuel cells

Oxygen permeation, thermal expansion behavior and electrochemical properties of LaBa_0.5Sr_0.5Co₂O_5+δ cathode for SOFCs

Crystal structure, thermal expansion and long-term behaviors of SmBaCoO_5+δ as cathode for intermediate-temperature solid oxide fuel cells

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Electrical, thermal and electrochemical properties of SmBa1−xSrxCo2O5+δ cathode materials for intermediate-temperature solid oxide fuel cells

Cited by 38 publications

References 48 publications

An analysis of SmBa0.5Sr0.5Co2O5+δ double perovskite oxide for intermediate–temperature solid oxide fuel cells

An analysis of SmBa0.5Sr0.5Co2O5+δ double perovskite oxide for intermediate–temperature solid oxide fuel cells

Oxygen permeation, thermal expansion behavior and electrochemical properties of LaBa0.5Sr0.5Co2O5+δ cathode for SOFCs

Crystal structure, thermal expansion and long-term behaviors of SmBaCoO5+δ as cathode for intermediate-temperature solid oxide fuel cells

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Oxygen permeation, thermal expansion behavior and electrochemical properties of LaBa_0.5Sr_0.5Co₂O_5+δ cathode for SOFCs

Crystal structure, thermal expansion and long-term behaviors of SmBaCoO_5+δ as cathode for intermediate-temperature solid oxide fuel cells