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MgO-MgAl2O4-Supported Flat-Tubular Segmented-In-Series SOFCs Featuring Ultra-High Conductivity Interlayer for
Yanan Li1, Xiang-Xiang Pan2, Hui-Yu Zhang1
1State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Abstract:
Development of a highly conductive interlayer with good multilayer interfacial compatibility is critical for achieving high-performance inert ceramic-supported flat-tubular segmented-in-series solid oxide fuel cells (FT-SIS-SOFCs). In this study, a high-performance MgO-MgAl2O4 (MMA)-supported solid oxide fuel cell is prepared by developing an innovative 70 vol % NiO-30 vol % MgAl2O4 interlayer via a cosintering process. The NiO-MgAl2O4 interlayer effectively suppresses MgO diffusion from the MMA substrate, limiting the diffusion distance to 25 μm. Additionally, the conductivity of the fabricated interlayer exceeds 3400 S cm-1 at the operational temperature. It exhibits excellent cosintering compatibility with the other functional layers. When the thickness of the NiO-MgAl2O4 interlayer is approximately 40 μm, the MMA-supported SOFC single cell shows an open circuit voltage (OCV) of about 1.07 V and a power density of 760 mW cm-2 at 850 °C, as well as excellent long-term stability. Moreover, the 16-cell FT-SIS-SOFCs show an OCV and maximum output power at 850 °C of 17 V and 15 W, respectively.
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