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Electrochemical and electrical properties of doped CeO2-ZnO composite for low-temperature solid oxide fuel cell applications
KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Hubei University, Wuhan, Hubei, China.ORCID iD: 0000-0002-3133-7031
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.ORCID iD: 0000-0001-8244-6572
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2018 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 392, p. 33-40Article in journal (Refereed) Published
Abstract [en]

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 1055 mW cm−2 is attained along with a high open circuit voltage (OCV) of 1.04 V at 550 °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 475–550 °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+/e− 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.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 392, p. 33-40
Keywords [en]
High ionic conductivity, Rectification characteristic, Semiconducting-ionic conductor, Solid oxide fuel cells, Triple O2-/H+/e− conduction, Zinc oxide
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-228718DOI: 10.1016/j.jpowsour.2018.04.096ISI: 000435055500005Scopus ID: 2-s2.0-85046400190OAI: oai:DiVA.org:kth-228718DiVA, id: diva2:1211014
Funder
Swedish Research Council, 621-2011-4983
Note

QC 20180530

Available from: 2018-05-30 Created: 2018-05-30 Last updated: 2018-07-17Bibliographically approved

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Xia, ChenAfzal, Muhammad

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