Application of silver in microtubular solid oxide fuel cells

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Colleges, School and Institutes

Abstract

In this paper, the behaviour of silver as cathode conductive material, interconnect wire, and sealing for anode lead connection for microtubular solid oxide fuel cells (μSOFC) is reported. The changes in silver morphology are examined by scanning electron microscopy on cells that had been operated under reformed methane. It is found that using silver in an solid oxide fuel cell (SOFC) stack can improve the cell performance. However, it is also concluded that silver may be responsible for cell degradation. This report brings together and explains all the known problems with application of silver for SOFCs. The results show that silver is unstable in interconnect and in cathode environments. It is found that the process of cell passivation/activation promotes silver migration. The difference in thermal expansion of silver and sealant results in damage to the glass. It is concluded that when silver is exposed to a dual atmosphere condition, high levels of porosity formation is seen in the dense silver interconnect. The relevance of application of
silver in SOFC stacks is discussed.

Details

Original languageEnglish
Article number16
Number of pages12
JournalMaterials for Renewable and Sustainable Energy
Volume7
Early online date14 Jun 2018
Publication statusPublished - Aug 2018