Effect of Y/Mg Ion Ratio and Phase Assemble on Ionic Conductivity of Multi-Doped Zirconia Ceramic Solid Electrolytes

Y.G. Hoo; Yusheng Shi; Wenzhong Lu

doi:10.20944/preprints201812.0047.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Version 1 : Received: 2 December 2018 / Approved: 4 December 2018 / Online: 4 December 2018 (08:43:39 CET)

The phase composition design principle is introduced to obtain balanced properties of ionic conductivity and thermo-tolerant for zirconia solid electrolytes used in solid oxide fuel cells (SOFCs). The zirconia ceramic solid electrolytes are fabricated by two-step free sintering. With increasing Y/Mg ionic ratio from 1.78:1 to 1.88:1, the content of monoclinic phase fluctuates little (±3%). The ionic conductivity, including the total electrical resistance; grain electrical resistance and grain boundary electrical resistance at 1223K, are all gradually declining with the increasing of Y/Mg ionic ratio. Furthermore, the enrichment of Mg ion in grain boundary acts as a disincentive to grain boundary ionic conductivity. In addition, the maximum total equivalent conductivity at 1223K in this study reaches to 0.143 Scm-1 which can compare with that of certain YSZ. It will be beneficial to SOFCs application profited from increasing ionic conductivity of ceramic solid electrolytes.

phase assemble, zirconia electrolyte, ionic conductivity, SOFCs

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Effect of Y/Mg Ion Ratio and Phase Assemble on Ionic Conductivity of Multi-Doped Zirconia Ceramic Solid Electrolytes

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