Kim, SG Yoon, SP Nam, SW Hyun, SH Hong, SA 2024-01-21T10:14:25Z 2024-01-21T10:14:25Z 2021-09-01 2002-07-20 0378-7753 https://pubs.kist.re.kr/handle/201004/139369 The compatibility of a composite electrolyte composed of a yttria stabilized zirconia (YSZ) film and a yttria-doped ceria (YDC) substrate in a solid oxide fuel cell (SOFC) that can be operated under 800 C was evaluated. The YSZ film coated on a YDC substrate was derived from a polymeric YSZ sol using a sol-gel spin coating method followed by heat-treatment at 1400 C for 2 h. The SEM and XRD analysis indicated that there were no cracks, pinholes, or byproducts. The composite electrolyte comprising a YSZ film of 2 mum thickness and a YDC substrate of 1.6 mm thickness was used in a single cell performance test. A 0.5 V higher value of open circuit voltage (OCV) was found for the composite electrolyte single cell compared with an uncoated YDC single cell between 700 and 1050 C and confirmed that the YSZ film was an electron blocking layer. The maximum power density of the composite electrolyte single cell at 800 C, 122 mW/cm(2) at 285 mA/cm(2), is comparable with that of a YSZ single cell with the same thickness at 1000 C, namely 144 mW/cm(2) at 330 mA/cm(2). The hypothetical oxygen partial pressure at the interface between the YSZ film and the YDC substrate for the composite electrolyte with the same thickness ratio at 800 C is 5.58 x 10(-18) atm which is two orders of magnitude higher than the equilibrium oxygen partial pressure of Ce2O3/CeO2, 2.5 x 10(-20) aim, at the same temperature. (C) 2002 Elsevier Science B.V. All rights reserved. English ELSEVIER SCIENCE BV OXIDE FUEL-CELLS DOPED CERIA YTTRIA Fabrication and characterization of a YSZ/YDC composite electrolyte by a sol-gel coating method Article 10.1016/S0378-7753(02)00270-7 1 JOURNAL OF POWER SOURCES, v.110, no.1, pp.222 - 228 JOURNAL OF POWER SOURCES 110 1 222 228 scie scopus 000176934600029 2-s2.0-24944554496 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article OXIDE FUEL-CELLS DOPED CERIA YTTRIA low temperature SOFC composite electrolyte sol-gel coating YSZ thin film single cell performance