Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7725106 | Journal of Power Sources | 2018 | 8 Pages |
Abstract
Zinc oxide (ZnO) as a multi-function semiconductor is widely known for photocatalysis and electronic applications but exceptionally new in Solid State Ionics. In this study, a new semiconducting-ionic conductor is reported for solid oxide fuel cells (SOFCs) applications by composing ZnO with an ionic conductor La/Pr co-doped CeO2 (LCP) in various mass ratios. The prepared composites acting as membranes are sandwiched between two Ni0.8Co0.15Al0.05LiO2-δ (NCAL) electrodes to construct fuel cells. A remarkable maximum power output of 1055â¯mWâ¯cmâ2 is attained along with a high open circuit voltage (OCV) of 1.04â¯Vâ¯at 550â¯Â°C by the fuel cell using an optimal composition of 7LCP-3ZnO. The electrical properties of the composites as a function of LCP/ZnO ratio are studied through EIS measurements and polarization curves. It has been found that the composite of 7LCP-3ZnO exhibits a higher ionic conductivity than other composite samples at 475-550â¯Â°C, while possessing both high electronic and ionic conduction. Our further investigation also verifies the appreciable protonic conduction in LCP-ZnO, suggesting that the developed composite is a triple O2-/H+/eâ conducting material. Additionally, rectification characteristic of the best-performance cell is also measured to interpret the high OCVs and power outputs of LCP-ZnO fuel cells.
Related Topics
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Authors
Zheng Qiao, Chen Xia, Yixiao Cai, Muhammad Afzal, Hao Wang, Jinli Qiao, Bin Zhu,