Microtubular SOFC using doped LaGaO₃ electrolyte film prepared with dip coating method

Abstract

Preparation of Microtubular cell using doped lanthanum gallate (LSGM) electrolyte with a dip coating and co-sintering process was studied. In order to suppress Ni diffusion from Ni-based anode substrate to LSGM electrolyte layer, Ti added La-doped ceria (Ti-LDC) was inserted as buffer layer. The amount of Ni diffused in LSGM electrolyte was investigated by EDX analysis as a function of sintering temperatures. It was found that sintering at 1350°C is suitable from the sintering density and the Ni diffusion. The cell sintered at 1350°C exhibited the higher power density than that of the conventional LSGM micro-tubular cell, even though a small amount of Ni diffusion was still observed at the Ti-LDC buffer layer/LSGM electrolyte interface. The microtubular cell with around 50¯m thickness showed the open circuit potential higher than 1.0 V and the maximum power density of 0.69, 0.31 and 0.12 W/cm 2 at 700, 600 and 500°C, respectively, were achieved.

Effects of Ce0.6Mn0.3Fe0.1O2-δInterlayer on Electrochemical Properties of Microtubular SOFC Using Doped LaGaO3Electrolyte

“…We have already reported that the preparation of a tubular cell with a relatively high performance was possible by suppressing the chemical reactions between LSGM and Ni with (LDC) buffer layer. 20 However, the diffusion of Ni to LSGM electrolyte layer cannot be completely suppressed only by LDC buffer layer and the electrochemical performance was still insufficient. We also reported that Mn-and Fe-doped CeO 2 (Ce 0.6 Mn 0.3 Fe 0.1 O 2-δ, CMF), which has a mixed ionic-electronic conductivity, 21 is also effective to prevent the Ni diffusion and can be used as an interlayer of planar type anode supported cell.…”

Characteristics of La_0.8Sr_0.2Ga_0.8Mg_0.2O_{3−δ}-supported micro-tubular solid oxide fuel cells with bi-layer and tri-layer electrolytes

“…However, direct comparisons of SOFCs with insertion of LDC between LSGM electrolyte and anode and those with introduction of LDC between LSGM electrolyte and both electrodes have never been reported in the literature. There are also very few reports in the literature regarding T-SOFCs with LSGM electrolytes, and these reports have focused either on anode-supported SOFCs with dip-coated and electrophoretically deposited thin LSGM electrolytes, 16)18) or on electrolyte-supported SOFCs with dip-coated or extruded LSGM tubes. 19), 20) The former T-SOFCs exhibit high power densities, but have problems with long-term stability.…”

Characteristics of Fe-air battery using Y2O3-stabilized-ZrO2 electrolyte with Ni–Fe electrode and Ba0.6La0.4CoO3-δ electrode operated at intermediate temperature

“…In addition, LaGaO 3 has a disadvantage in the case of thin file electrolyte; it is difficult to reduce the thickness of LaGaO 3 electrolyte into less than 50 m, whereas the thickness can be easily reduced into 5 m in the case of YSZ electrolyte [13]. This is because LaGaO 3 easily reacts with Ni electrode and forms La 2 NiO 4 , which is not stable and leads to the delamination [17,18]. In the case of ZrO 2 based electrolyte, it has been already reported by Leonide [19,20].…”