High energy storage of La-doped PbZrO3 thin films using LaNiO3/Pt composite electrodes with wide temperature range

With the evolution of power electronic system to miniaturization and integration, dielectric capacitors are extensively studied in electric power systems such as electron beam and direction energy weapons owing to outstanding energy storage density and low loss. In this work, Pb 0.97 La 0.02 ZrO 3 (PLZ) films were deposited on LaNiO 3 (LNO)/Pt and LNO electrodes using sol-gel method, respectively. High spontaneous polarization ( P s ~ 91.3 μC cm −2 ) and low remanent polarization ( P r ~ 7.3 μC cm −2 ) can be obtained from PLZ/LNO/Pt/TiO 2 /SiO 2 /Si with energy storage density up to 25.4 J cm −3 , which could be explained by good ohmic contact between films and composite electrodes. Besides, recoverable energy storage of films exhibits outstanding temperature stability (25.9–25.3 J cm −3 ) over -60 - 20 °C. These results suggest that LNO/Pt composite electrodes can be used to optimize PLZ films properties, which could be considered as a valid way for developing wide temperature range energy-storage capacitors. Highlights High quality PbLaZrO 3 (PLZ) films could be obtained by LaNiO 3 (LNO)/Pt electrode owing to good ohmic contact and lattice matching between films and composite electrode. High spontaneous polarization ( P s ~ 91.3 μC cm −2 ) and low remanent polarization ( P r ~ 7.3 μC cm −2 ) can be obtained in PLZ/LNO/Pt/TiO 2 /SiO 2 /Si. Excellent energy storage could be obtained in PLZ films within wide temperature range (−60–200 °C). Especially, recoverable energy storage of films exhibits outstanding temperature endurance (25.9–25.3 J cm −3 ) over −60–20 °C.