• Kishimoto, Haruo
• Bagarinao, Katherine Develos
• Celikbilek, Ozden
• Kerherve, Gwilherm
• Skinner, Stephen
• Fearn, Sarah

Abstract

<jats:p>Nanostructured La<jats:sub>0.6</jats:sub>Sr<jats:sub>0.4</jats:sub>CoO<jats:sub>3-</jats:sub><jats:italic><jats:sub>δ</jats:sub></jats:italic></jats:p><jats:p>(LSC) thin film electrodes exhibit exceptionally high oxygen surface exchange properties, surpassing those of conventional microscale electrode structures, which are desirable for application in solid oxide cells (SOCs). Here, towards the goal of improving the long-term stability of electrochemical performance of nanostructured LSC thin films, a systematic investigation of the effect of processing temperatures on long-term stability was carried out. By varying the deposition temperature (from 500 °C to room temperature), the as-grown characteristic nanostructures of LSC thin films prepared using pulsed laser deposition can be tuned from highly dense nanocolumnar grains to nanofibrous structures with high porosity. From the comparison of the properties of the as-grown films and those annealed at 700 °C for 300 h, it was revealed that LSC thin films prepared at lower deposition temperatures are less prone to the grain sintering effect and cation interdiffusion and exhibit better interfacial stability and improved long-term performance.</jats:p>

Topics

• surface
• grain
• thin film
• Oxygen
• laser emission spectroscopy
• porosity
• pulsed laser deposition
• sintering
• interdiffusion
• liquid-solid chromatography