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Ionic conductivity increase by one order of magnitude in BCY composite electrolyte added with Li2O
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| 【文章作者】You, Jie;Chen, Gang;Wei, Kai;Xu, Siwen;Lv, Zimeng;Geng, Shujiang |
| 【文章摘要】 The low ionic conductivity of proton conductor electrolytes at low temperatures was one of the key issues that restrict the reduction of operating temperature in ceramic fuel cells. The traditional Y-doped BaCeO3 proton conductor (BCY) has an ionic conductivity of only a few tens of mS & sdot;cm- 1 at 500 degrees C, which cannot meet the needs of high-performance low-temperature ceramic fuel cells. In this paper, we found that the ionic conductivity of the composite electrolyte made by adding 20 % Li2O to BCY at 550 degrees C was 0.526 S cm- 1, which was 40 times that of the dense BCY electrolyte sintered at 1550 degrees C. The maximum power density of a ceramic fuel cell using a BCY-Li2O composite material with a thickness of 1 mm as the electrolyte and porous Ag as the symmetrical electrode was 129 mW cm-2 in H2 at 550 degrees C. The characterization results of XRD, EPR, and FTIR showed that there may be a region with a large number of oxygen vacancies and lithium vacancies created at the interface of the BCY and Li2O-LiOH composite electrolyte formed in the BCY-Li2O composite electrolyte during the testing conditions for fuel cell performance due to the migration of Li+. The formation of this region should be the main reason for the extremely high conductivity of the BCY-Li2O-LiOH composite electrolytes formed in the cell at low temperatures. |
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【卷】【ISSUE】【ISSUEID】
【文章期份】2024
【发布日期】2025/5/13 10:26:34
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