Effect of Ca on the Properties of Gd-Doped Ceria for IT-SOFC

• 作者: C. V. Reddy G. Padmaja G. Upender K. C. James Raju S. Mohan Reddy S. Ramesh
• 来源期刊: 现代物理(英文)
• 学科: 化学
• 关键词: CERAMIC SOL-GEL Process ACTIVATION Energy Electrical CONDUCTIVITY Solid ELECTROLYTE
• 年，卷（期）: 2013,（6）
• 页码范围: 859-863
• 页数: 5页
• 分类号: O6

摘要

Ceria based electrolyte materials are very useful in intermediate-temperature solid oxide fuel cell (IT-SOFC). The compositions Ce0.85Gd0.15 - xCaxO2 - δ (x = 0.0 - 0.075) were prepared through sol-gel method. Their structure was studied by X-ray diffraction. Dense ceramic Ce0.85Gd0.15 - xCaxO2 - δ samples were prepared by sintering the pellets at 1300°C. The lattice parameter was calculated by Rietveld refinement of XRD patterns. Four probe A.C. impedance spectroscopy was used to study the total ionic conductivity of doped and co-doped ceria ceramics in the temperature range 200°C - 700°C. The Ce0.85Gd0.15 -xCaxO2 -δ composition showed maximum ionic conductivity with less activation energy.