Jee, Youngseok Cho, Gu Young An, Jihwan Kim, Hae-Ryoung Son, Ji-Won Lee, Jong-Ho Prinz, Fritz B. Lee, Min Hwan Cha, Suk Won 2024-01-20T10:00:18Z 2024-01-20T10:00:18Z 2021-09-05 2014-05-01 0378-7753 https://pubs.kist.re.kr/handle/201004/126804 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 (<similar to 800 degrees C) and operating conditions (<similar to 600 degrees C, dry H-2) 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. 2013 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV YTTRIA-STABILIZED ZIRCONIA GADOLINIA-DOPED CERIA BILAYER ELECTROLYTE THIN-FILMS CONDUCTIVITY TRANSPORT CERAMICS High performance Bi-layered electrolytes via atomic layer deposition for solid oxide fuel cells Article 10.1016/j.jpowsour.2013.12.001 1 JOURNAL OF POWER SOURCES, v.253, pp.114 - 122 JOURNAL OF POWER SOURCES 253 114 122 scie scopus 000331160100015 2-s2.0-84891697859 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article YTTRIA-STABILIZED ZIRCONIA GADOLINIA-DOPED CERIA BILAYER ELECTROLYTE THIN-FILMS CONDUCTIVITY TRANSPORT CERAMICS solid oxide fuel cell Atomic layer deposition YSZ/GDC bi-layer Sintering temperature Ceria reduction