LSM이 코팅된 고체산화물 연료전지용 Crofer Mesh 집전체 개발
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초록
본 연구에서는 고체산화물 연료전지의 공기극 집전체로 사용되고 있는 고가의 Ag 소재를 대체하고자 전도성 세라믹이 코팅된 mesh 형태의 Crofer 22 APU 집전체를 개발하였다. 고전자전도성의(La0.80Sr0.20)0.98MnO3 (LSM)을 습식 스프레이법으로 코팅하여 고온 산화 및 전기적 특성의 열화를억제하고자 하였다. 800˚C의 산화 실험 결과에 의하면 LSM이 코팅된 Crofer mesh의 면저항(area-specific resistance)은 mesh의 제작에 사용된 와이어 지름과 접촉 부위의 형상등 실제 접촉점의수 및 면적을 좌우하는 mesh의 특성에 의해 좌우되었다. 또한 LSM 코팅 후 H2/N2 분위기에서의열처리를 통해 Crofer mesh와 LSM 코팅층 계면에서의 Cr 함유 산화물의 형성을 효과적으로억제하여 전기적 특성의 열화를 억제할 수 있다.
Abstract
A Crofer 22 APU mesh coated with a conductive ceramic material was developed as an alternative cathode current collector to Ag-based materials for solid oxide fuel cells. (La0.80Sr0.20)0.98MnO3 (LSM) layer was deposited onto the Crofer mesh using a spray-coating technique, in an attempt to mitigate the degradation of electrical properties due to surface oxidation at high temperatures. The oxidation experiments at 800˚C in air indicated that the areaspecific resistance (ASR) of the LSM-coated Crofer mesh was strongly dependent on the wire diameter and the contact morphology between mesh and cell. In addition, the post-heat-treatment in H2/N2 resulted in a reduced thickness of Cr-containing oxide scales at the interface between Crofer mesh and LSM layer, leading to a decreased ASR.
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