Performances Of La_0.8Sr_0.2Ga_0.85Mg_0.15O_2.825 Film Solid Oxide Fuel Cell Prepared On NiO/SDC Anode Support

A fuel cell is an electrochemical generator with high efficiency and lowpollution. It possesses several distinct advantages, such as environmentalfriendship, higher conversion efficiency and broad adaptive fuel. It iscomposed of an electrolyte between cathode and anode.A solid oxide fuel cell (SOFC) is the third generation fuel cell, and all thecomponents in SOFC are solid. So it has many advantages, such as noproblem of corrosion and leakage, long lifetime and so on. It is called the newgreen energy of the 21 century.A conventional SOFC use yttrium-stabilized zirconia (YSZ) as electrolyte,it is required to operate at ~1000℃because of the low ionic conductivity ofYSZ at lower operating temperatures. In order to reduce the operatingtemperature (<800℃), two approaches is considered: one is to reduce thethickness of YSZ electrolyte membrane, and the other is to develop new solidelectrolyte with high oxide-ion conductivity below 800℃.In the past years, a new perovskite-type electrolyte based on strontiumand magnesium doped lanthanum gallate (LSGM) has been widely studied.The conductivity of LSGM is superior to that of the commonly YSZ at thesame temperature. Both the ohmic loss at the solid electrolytes and thepolarization loss at the anode and cathode can increase due to the lowoperating temperature. In order to enhance the current density and outputpower density, it is desired to reduce the thickness of the electrolytes. In thispaper, we use the colloid deposition method to prepareLa0.8Sr0.2Ga0.85Mg0.15O2.825 (LSGM) electrolyte membrane on a NiO/Ce0.8Sm0.2O1.9 (SDC) anode support. Because interfacial reaction occurredbetween Nickel oxide and LSGM during sintering, reducing the performanceof the single cell. We add a thin SDC interlayer between the anode andelectrolyte to prevent formation of Lanthanum nickelates. The performance of Ni-SDC anode support was studied. The results showthat the anode support of Ni-SDC after reduction with porosity of 38.3%,44.5%,46.7%和48.5% can be attained ,when the pore-forming agent are in arange of 0%,1%.,2%. and 3%. While the porosities of Ni-SDC anode supportbefore reduction are 16.3%, 23.9%, 29.3% and 33.6%. So we use the anodesupport without pore-forming agent. The porosity of Ni-SDC anode afterreduction is 15-20% higher than that before reduction, and the conductivity ishigher 102-103 in the magnitude than that before reduction. The LSGM films were prepared on NiO/SDC substrate using colloiddeposition. The results show that a relative dense LSGM film with 45.4μm inthickness can be attained sintering at 1400℃for 6h, and the conductivity is...