Stability and performance of silver in an SOFC interconnect environment

Charles Compson*, Choi Songho, Harry Abemathy, Yong-Man Choi, Liu Meilin

*此作品的通信作者

研究成果: Conference contribution同行評審

3 引文 斯高帕斯(Scopus)

摘要

The inert properties of silver over a wide temperature range make it a strong candidate for an SOFC interconnect material. This work evaluated the effectiveness of silver as an intermediate temperature solid oxide fuel cell (ITSOFC) interconnect through permeation, degradation and stability testing. The oxygen flux though 50μm silver foil was measured as a function of temperature using mass spectrometry. The measured oxygen flux through the silver foil was consistent with values found in the literature and was further used to calculate the equivalent leaking current density through silver, which was 1.46*10-2mA/cm2 at 750°C Stability tests in O2, H2, Ar and O2/H2 dual atmospheres were performed on both silver foil and dense silver layers sputtered on Ni-YSZ anodes. The stability of silver was highest in the inert Argon atmosphere and lowest in the O2/H2 dual atmosphere, which revealed large pores after only 24hrs exposure at 750°C Based on the observed experimental degradation, we estimated a minimum silver degradation rate of 1.6*10-4cm/s and compared that with calculated thermodynamic loss rates. These experimental and calculated values were so close that we were able to then predict the experimental degradation rate of silver over a wide range of operating temperatures. Considering the effective leaking current density through silver and estimated degradation rate, silver appears to be suitable for use as an SOFC interconnect at temperatures less than 650°C.

原文English
主出版物標題Advances in Solid Oxide Fuel Cells III - A Collection of Papers Presented at the 31st International Conference on Advanced Ceramics and Composites
頁面301-312
頁數12
版本4
DOIs
出版狀態Published - 10月 2007
事件31st International Conference on Advanced Ceramics and Composites - Daytona Beach, FL, United States
持續時間: 21 1月 200726 1月 2007

出版系列

名字Ceramic Engineering and Science Proceedings
號碼4
28
ISSN(列印)0196-6219

Conference

Conference31st International Conference on Advanced Ceramics and Composites
國家/地區United States
城市Daytona Beach, FL
期間21/01/0726/01/07

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