HIGH POWER DENSITY SOLID OXIDE FUEL CELLS USING LaGaO_3 PEROSKITE OXIDE THIN FILM PREPARED BY PLD METHOD

摘要

In order to improve the power generation property of metal supported solid oxide fuel cell, control of Sm_(0.5)Sr_(0.5)CoO_3 cathode layer was studied. Dense and thin SSC layer with nano size cone shape was fabricated on thin LSGM/SDC bi-layer electrolyte with the pulsed laser deposition (PLD) method by optimizing the deposition condition. The power generation property and the thermal cycling durability were much increased by inserting cone-shaped SSC layer. In addition, columnar structural Sm_(0.2)Ce_(0.8)O_2 (SDC)-Sm_(0.5)Sr_(0.5)CoO_(3-δ) (SSC) interlayer was fabricated between thin La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(3-δ) (LSGM) electrolyte and SSC cathode layer by PLD. By inserting the double columnar shape interlayer, power generation property of the metal supported cell was much improved at intermediate temperatures (973 K ～ 773 K) with reducing cathodic overpotential. The maximum power density was achieved a value of 2.2 W/cm~2 at 973 K on this cell.