期刊
MATERIALS
卷 11, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/ma11010040
关键词
semiconducting-ionic conductor; solid oxide fuel cells; zinc oxide; composite electrolyte; proton conduction
类别
资金
- National Natural Science Foundation of China [51502084, 51372075]
- Natural Science Foundation of Hubei Province [2015CFA120]
- Swedish Research Council [621-2011-4983]
- European Commission FP7 TriSOFC-project [303454]
Semiconducting-ionic conductors have been recently described as excellent electrolyte membranes for low-temperature operation solid oxide fuel cells (LT-SOFCs). In the present work, two new functional materials based on zinc oxide (ZnO)-a legacy material in semiconductors but exceptionally novel to solid state ionics-are developed as membranes in SOFCs for the first time. The proposed ZnO and ZnO-LCP (La/Pr doped CeO2) electrolytes are respectively sandwiched between two Ni0.8Co0.15Al0.05Li-oxide (NCAL) electrodes to construct fuel cell devices. The assembled ZnO fuel cell demonstrates encouraging power outputs of 158-482 mW cm(-2) and high open circuit voltages (OCVs) of 1-1.06 V at 450-550 degrees C, while the ZnO-LCP cell delivers significantly enhanced performance with maximum power density of 864 mW cm(-2) and OCV of 1.07 V at 550 degrees C. The conductive properties of the materials are investigated. As a consequence, the ZnO electrolyte and ZnO-LCP composite exhibit extraordinary ionic conductivities of 0.09 and 0.156 S cm(-1) at 550 degrees C, respectively, and the proton conductive behavior of ZnO is verified. Furthermore, performance enhancement of the ZnO-LCP cell is studied by electrochemical impedance spectroscopy (EIS), which is found to be as a result of the significantly reduced grain boundary and electrode polarization resistances. These findings indicate that ZnO is a highly promising alternative semiconducting-ionic membrane to replace the electrolyte materials for advanced LT-SOFCs, which in turn provides a new strategic pathway for the future development of electrolytes.
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