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Semiconductor electrolyte for low-operating-temperature solid oxide fuel cell: Li-doped ZnO
KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Hubei Univ, Fac Phys & Elect Sci, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Wuhan 430062, Hubei, Peoples R China.ORCID iD: 0000-0002-3133-7031
Hubei Univ, Fac Phys & Elect Sci, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Wuhan 430062, Hubei, Peoples R China.;Huanggang Normal Univ, Coll Mech & Elect Engn, Huanggang 430062, Hubei, Peoples R China..
Hubei Univ, Fac Phys & Elect Sci, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Wuhan 430062, Hubei, Peoples R China..
Hubei Univ, Fac Phys & Elect Sci, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Wuhan 430062, Hubei, Peoples R China..
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2018 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 43, no 28, p. 12825-12834Article in journal (Refereed) Published
Abstract [en]

Semiconductors have been successfully demonstrated as the electrolytes for solid oxide fuel cells (SOFCs) in recent years. Many such semiconductors have shown their potentials as a competent ionic conductor for fuel cell operation, indicated by the appreciable ionic conduction and electrochemical performance. In the present study, we depart from traditional electrolyte concept to introduce a new semiconductor electrolyte, Li-doped ZnO to low-operating-temperature SOFCs. The used material was synthesized via a co-precipitation method and investigated from phase structure, morphology and UV-vis absorption perspectives. Utilizing Li-doped ZnO as electrolyte layer, we found the corresponding fuel cell exhibited a remarkable maximum power density of 443 mW cm(-2) along with open circuit voltage (OCV) of 1.07 V at 550 degrees C, and represented a lower-temperature operation feasibility with power outputs of 138-165 mW cm(-2) at 425-450 degrees C. Besides, high ionic conductivities of 0.028-0.087 S cm(-1) and low activation energy of 0.5 eV were also found in the synthesized Li-doped ZnO at 425-550 degrees C. Our investigation in terms of electrochemical impedance spectra (EIS) analysis manifested that Li-doped ZnO as the electrolyte layer boosted the electrode reactions of the device, which resulted in rather small polarization resistances and eventually realized good low-temperature performances. Further study based on the rectification characteristic of Ni/Li-doped ZnO contact verified the Schottky junction formation of Li-doped ZnO with anodic Ni, which can avoid the underlying electronic short-circuiting problem. These findings show a profound significance of using doped semiconductor for the future exploitation of SOFC electrolytes.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 43, no 28, p. 12825-12834
Keywords [en]
Semiconductor electrolyte, Li-doped ZnO, Low-temperature SOFCs, Good performance, Schottky junction
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-240215DOI: 10.1016/j.ijhydene.2018.04.121ISI: 000439678700030Scopus ID: 2-s2.0-85033590818OAI: oai:DiVA.org:kth-240215DiVA, id: diva2:1271344
Conference
Forum of Hydrogen and Fuel Cells, DEC 11-13, 2017, Hubei Univ, Wuhan,China
Note

QC 20181217

Available from: 2018-12-17 Created: 2018-12-17 Last updated: 2018-12-17Bibliographically approved

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