Easy sintering of silver doped lanthanum strontium manganite current collector for solid oxide fuel cells

Abstract

A new system, (La 0.8Sr 0.2) 1 − x Ag x MnO 3+ δ (LSAM, x ≤ 0.2), is developed as current collector for solid oxide fuel cell (SOFC). LSAM is prepared by a modified sol–gel method and presents a single phase. The shrinkage temperature reduces from 1150 °C to 800 °C with an addition of 15 mol% Ag to La 0.8Sr 0.2MnO 3+ δ (LSM20). The contact resistance between the current collector and the cathode is measured, and the influence of Ag content on the contact resistance is investigated. The result shows that the contact resistance using (La 0.8Sr 0.2) 0.85Ag 0.15MnO 3+ δ (LSAM15) as current collector is about 12 mΩ cm 2 at 750 °C, which is close to the value using expensive Pt paste as current collector. This new system is a promising current collecting material for the practical application of SOFC.