Semiconductor heterostructure composite materials of Fe2O3 and CeO2 for low-temperature solid oxide fuel cells


There is a rapid growing interest in low-temperature operation of solid oxide fuel cells (LTSOFCs). Recent advances in composited or doped CeO2 have resulted in high ion conductivity at low temperature below 600 °C. However, doped CeO2 faced reduced electronic conduction by fuel cell operation. In this study, we report a semiconductor heterostructure of CeO2–Fe2O3 for the electrolyte applications. We successfully developed high ionic conduction up to 0.18 S cm−1 while suppressing its electronic conduction following a good fuel cell demonstration of 403 mW cm−2 at 530 °C. The mechanism of ionic conduction and enhanced conductivity as well as suppression of electronic conductivity has been further investigated. Our findings demonstrate that the composite of the semiconductor heterostructure materials is a highly promising electrolyte for LTSOFCs.

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This work was supported by the Natural Science Foundation of Jiangsu Higher Education Institutions of China (Grant No. 19KJB480010; 18KJD480004), the Natural Science Foundation of Jiangsu Province (Grant No. BK20190137).

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Correspondence to Yuzheng Lu.

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Li, J., Lu, Y., Li, D. et al. Semiconductor heterostructure composite materials of Fe2O3 and CeO2 for low-temperature solid oxide fuel cells. J Mater Sci: Mater Electron 31, 11825–11832 (2020).

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