Abstract:In SmBa1-xCaxCo2O5+d (x = 0.01, 0.03, 0.1, and 0.2, SBCCO) oxide systems calcined at 1100°C for 8 h, the XRD patterns of the SBCCO single phase were maintained in the cases of SmBa0.97Ca0.03Co2O5+d (SBCCO-0.97) and SmBa0.99Ca0.01Co2O5+d (SBCCO-0.99) compositions. In SmBa0.8Ca0.2Co2O5+d (SBCCO-0.8) and SmBa0.9Ca0.1Co2O5+d (SBCCO-0.9), CaCoSmO4 existed with the pattern SBCCO. SBCCO structures were identified as orthorhombic crystal structures because they showed splitting of the X-ray diffraction (XRD) peaks at … Show more
“…For the SOFC technology to be economically viable, reduction in the manufacturing cost of cell components and selectivity of suitable materials for low-temperature operating conditions are vital. In the recent past, noticeable progress has been made in the development of thinner electrolytic membranes 8,9 and vibrant active electrode materials 10,11 that lowered the operating temperature window of SOFC to ∼ 400-800 • C. Perhaps, most of the reported manufacturing techniques for these electrodes preparation engage high-cost equipment, which also involves longer time periods to adjust the processing parameters. 12,13 Ni-GDC cermet has been categorized by numerous investigations as an efficient anodic material for MT-SOFC, Ni-GDC cermet excelled with its superior oxidation of H 2 and better structural stability at intermediate temperatures.…”
By this work, the viability of the spray coating as a cost‐effective and reliable technique for the coating of Ce0.9Gd0.1O1.95 (GDC) electrolyte layer on the mini‐tubular NiO–GDC anodes based a solid oxide fuel cell (SOFC) fabrication was assessed. The compatibility of the anode and electrolyte was analyzed by using XRD. The variation in thickness and morphology of the electrolyte film as a function of the coating cycles was discussed with optical and scanning electron microscopes. By similar formulation, the coating of La0.6Sr0.4Fe0.8Co0.2O3 –Ce0.9Gd0.1O2–δ (LSCF–GDC) was performed to achieve porous cathode. An individual micro‐tubular anode supported cell with configuration NiO–GDC/GDC/LSCF–GDC as anode/electrolyte/cathode was tested in the SOFC mode with humidified hydrogen as fuel and stationary air as oxidant. The fabricated mini‐SOFC prototype that generated a maximum power density of 0.510 W/cm2 at 600°C signifies the potential of this industrially scalable low‐cost coating technique.
“…For the SOFC technology to be economically viable, reduction in the manufacturing cost of cell components and selectivity of suitable materials for low-temperature operating conditions are vital. In the recent past, noticeable progress has been made in the development of thinner electrolytic membranes 8,9 and vibrant active electrode materials 10,11 that lowered the operating temperature window of SOFC to ∼ 400-800 • C. Perhaps, most of the reported manufacturing techniques for these electrodes preparation engage high-cost equipment, which also involves longer time periods to adjust the processing parameters. 12,13 Ni-GDC cermet has been categorized by numerous investigations as an efficient anodic material for MT-SOFC, Ni-GDC cermet excelled with its superior oxidation of H 2 and better structural stability at intermediate temperatures.…”
By this work, the viability of the spray coating as a cost‐effective and reliable technique for the coating of Ce0.9Gd0.1O1.95 (GDC) electrolyte layer on the mini‐tubular NiO–GDC anodes based a solid oxide fuel cell (SOFC) fabrication was assessed. The compatibility of the anode and electrolyte was analyzed by using XRD. The variation in thickness and morphology of the electrolyte film as a function of the coating cycles was discussed with optical and scanning electron microscopes. By similar formulation, the coating of La0.6Sr0.4Fe0.8Co0.2O3 –Ce0.9Gd0.1O2–δ (LSCF–GDC) was performed to achieve porous cathode. An individual micro‐tubular anode supported cell with configuration NiO–GDC/GDC/LSCF–GDC as anode/electrolyte/cathode was tested in the SOFC mode with humidified hydrogen as fuel and stationary air as oxidant. The fabricated mini‐SOFC prototype that generated a maximum power density of 0.510 W/cm2 at 600°C signifies the potential of this industrially scalable low‐cost coating technique.
“…Perovskite and its structural variants are utilized as high-performance cathodes for IT-SOFC. Cobaltite which has excellent electrochemical properties, has been studied as a cathode material for IT-SOFCs [6,7]. Double perovskites are suitable as IT-SOFC cathode materials, which require greater surface exchange kinetics and faster oxygen diffusion rates in a moderate temperature range [8].…”
Modifying the sample surface by infiltration technique using Ce0.8Sm0.2O1.9 (SDC) electrolyte has been done to increase the catalytic activity of the LaBa0.5Sr0.5Co2O5+δ (LBSC) cathode. The cathode powder structure was evaluated using X-ray diffraction (XRD) at room temperature, and the LBSC cathode microstructure was analyzed using scanning electron microscopy (SEM). The electrical conductivity of the LBSC cathode was tested using the four-probe DC method. Symmetrical cells were tested using a potentiostat Voltalab PGZ 301 and a digital source meter Keithley 2420. LBSC powder was discovered to have a tetragonal structure (space group: P4/mmm) with lattice parameters of a = 3.86253 Å, c = 7.73438 Å, and V = 115.338 Å. From the SEM image, the LBSC cathode has homogeneous, dense, and highly porous grains. The electrical conductivity showed metallic behavior, gradually decreasing from 167 S.cm-1 at 300℃ to 105 S.cm-1 at 800℃. A significant increase in current density (io) of 275% occurred at 800℃ from 154.10 mA.cm−2 (pure LBSC) to 577.86 mA.cm−2 (LBSC+0.5M SDC). The activation energy value (Ea) of symmetrical cells was determined using electrochemical impedance spectroscopy (EIS), low-field (LF), and high-field (HF) techniques. The activation energy of the LBSC+0.5 M SDC specimen was 47.9 kJ mol-1 or 79.4% lower than the activation energy of the LBSC cathode specimen without infiltration at atmospheric pressure of 0.03 atm. These results indicate that SDC infiltration of the LBSC cathode can reduce the activation energy of the significant. The cathode membrane adheres quite well to the electrolyte membrane, the cathode porosity varies in the range of 1–4 µm, and the grain size is 0.1–1.5 µm.
“…However, when various materials are substituted, dislocations according to the coulomb potential and elastic potential act on the cathode lattice due to disorder, preventing oxygen ion movement [18]. To solve these problems, many researchers have focused on the development of layered perovskites having a chemical composition of AA / B2O5+d (A: lanthanide Ln, A / : Ba or Sr, B: Co) as cathode materials for SOFCs [20][21][22][23][24][25][26][27]. In layered perovskite, specific crystallographic characteristics have been reported in the case of Ba substituted for the A-site.…”
Section: Introductionmentioning
confidence: 99%
“…Table1summarizes the characteristics of the LnBaCo2O5+d composition of layered perovskite cathode materials. Many research groups reported that the cathode of SOFCs show excellent electrochemical properties whenever the cathode material displays high electrical conductivity[20][21][22][23][24][25][26][27].…”
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