High performance Bi-layered electrolytes via atomic layer deposition for solid oxide fuel cells
- High performance Bi-layered electrolytes via atomic layer deposition for solid oxide fuel cells
- 지영석; 조구영; 안지환; 김혜령; 손지원; 이종호; Fritz B. Prinz; 이민환; 차석원
- solid oxide fuel cell; Atomic layer deposition; YSZ/GDC bi-layer; Sintering temperature; Ceria reduction
- Issue Date
- Journal of power sources
- VOL 253, 114-122
- This study investigates the functionality of bi-layered electrolytes in intermediate temperature solid
oxide fuel cells. A thin yttria-stabilized zirconia (YSZ) layer is expected to protect the underlying
gadolinia doped ceria (GDC) electrolyte from being chemically reduced and significantly improve cell
stability and durability. Although a thinner YSZ layer is preferable to minimize ohmic loss, there are
limitations as to how thin the YSZ film can be and still serves as a valid protection layer. The limitation is
partially attributed to the inter-diffusion and significant morphological changes during the high temperature
sintering processes. In this study, a stable operation was demonstrated for extended duration
(>80 h) with only a 28 nm YSZ layer (corresponding to a YSZ/GDC thickness ratio of 6.5 x 10-5) when
limitations in both fabrication (<~800 ℃) and operating conditions (<~600 ℃, dry H2) were imposed.
Furthermore, the functionality of a protection layer with a given thickness was found to strongly depend
on the method of depositing the protective layer. Protective layers deposited by atomic layer deposition
(ALD) can be much thinner than those prepared by physical vapor deposition; the YSZ/GDC thickness
ratio for a stable operation approached close to a theoretical value when the ALD was used.
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