To fabricate the YSZ thin-film oxygen sensor with low operating
temperature, (La,Sr)(Co,Ni)O3 (LSCNO) thin film was examined on the point of catalytic activity. LSCNO
electrode deposited on YSZ thin-film by pulsed laser deposition showed higher catalytic activity than Pt
electrodes at lower temperature than 300oC by AC impedance measurement. EMF value was measured even at
197oC which was lower than that of theoretical value.