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Study on zinc oxide-based electrolytes in low-temperature solid oxide fuel cells
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. Hubei University, China.ORCID iD: 0000-0002-3133-7031
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2017 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 11, no 1, article id 40Article in journal (Refereed) Published
Abstract [en]

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 °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 °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 °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.

Place, publisher, year, edition, pages
MDPI AG , 2017. Vol. 11, no 1, article id 40
Keywords [en]
Composite electrolyte, Proton conduction, Semiconducting-ionic conductor, Solid oxide fuel cells, Zinc oxide
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-220965DOI: 10.3390/ma11010040ISI: 000427764000040Scopus ID: 2-s2.0-85039794294OAI: oai:DiVA.org:kth-220965DiVA, id: diva2:1172595
Funder
Swedish Research Council, 621-2011-4983EU, FP7, Seventh Framework Programme, 303454
Note

QC 20180110

Available from: 2018-01-10 Created: 2018-01-10 Last updated: 2018-04-11Bibliographically approved

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Xia, Chen

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