压实压力对用于中温固体氧化物燃料电池的钆掺杂二氧化铈电解质阻抗的影响
Influence of compaction pressure on the impedance of Gadolinium Doped Ceria electrolytes for IT-SOFCs
浏览论文内容
中文总结 AI 辅助
研究钆掺杂二氧化铈电解质，在不同等静压下制备并烧结陶瓷颗粒，沉积铂电极后用阻抗谱表征电学性质，发现阻抗与压实压力有关。
中文摘要 AI 辅助
钆掺杂二氧化铈（GDC）是一种有前景的用于中温固体氧化物燃料电池（IT-SOFCs）的氧离子传导陶瓷电解质。尽管对其内在离子传输机制已有广泛了解，但陶瓷加工参数对多晶GDC电解质有效电学行为的影响仍是研究热点。本文在49至140MPa系统变化的等静压下制备致密GDC陶瓷颗粒，1350℃烧结4小时，电子束沉积铂电极，通过电化学阻抗谱表征电学性质，结果表明阻抗与压实压力有关。
英文摘要
Gadolinium doped ceria (GDC) is one promising oxygen-ion conducting ceramic electrolyte for intermediate-temperature solid oxide fuel cells (IT-SOFCs), due to its high ionic conductivity at reduced operating temperatures, favorable defect chemistry, and compatibility with a broad range of electrode materials [1,2]. Despite extensive understanding of its intrinsic ion transport mechanisms, the influence of ceramic processing parameters on the effective electrical behavior of polycrystalline GDC electrolytes remains an active topic for investigation [3-5]. In particular, processing steps that govern green body formation and sintering can strongly affect microstructural features such as density, grain size, grain boundary character, and residual porosity, which in turn determine the macroscopic conductivity [4-6]. In this work, dense GDC ceramic pellets were fabricated under systematically varied isostatic compaction pressures ranging from 49 to 140 MPa, followed by sintering at 1350 C for four hours under identical thermal conditions. Platinum electrodes were deposited on both sides of the pellets by electron-beam deposition, and the electrical properties were characterized by electrochemical impedance spectroscopy (EIS) over a wide temperature range. The results demonstrate a dependence of the impedance with respect to compaction pressure.
