Anomaly Negative Resistance Phenomena in Highly Epitaxial PrBa0.7Ca0.3Co2O5+δ Thin Films Induced from Superfast Redox Reactions

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dc.contributor.authorLuo, Yumei
dc.contributor.authorXu, Xing
dc.contributor.authorXia, Yudong
dc.contributor.authorPang, Shengli
dc.contributor.authorXu, Fen
dc.contributor.authorWhangbo, Myung-Hwan
dc.contributor.authorSun, Lixian
dc.contributor.authorChen, Chonglin
dc.date.accessioned2021-12-23T15:06:33Z
dc.date.available2021-12-23T15:06:33Z
dc.date.issued2021-11-26
dc.date.updated2021-12-23T15:06:34Z
dc.description.abstractThin films of Ca-doped double perovskite, PrBa0.7Ca0.3Co2O5+δ (PBCC), were epitaxially grown on (001) SrTiO3, and their redox reactions under a switching flow of H2 and O2 gases were examined at various temperatures by measuring the resistance R(t) of the films as a function of the gas flow time t. In the temperature range between 350 and 725 ◦C, these thin films are reduced and oxidized in an ultrafast manner under the flow of H2 and O2 gases, respectively, suggesting that PBCC thin films are promising candidates for developing ultra-sensitive oxygen sensors or SOFC cathodes at intermediate or high temperatures. When the gas flow is switched to O2, the reduced PBCC thin films exhibit a negative resistance at temperatures above 600 ◦C but a positive resistance at temperatures below 600 ◦C. The probable cause for these anomalous transport properties is the diffusion of the H atoms from the cathode to the anode in the PBCC film, which provides a current opposite to that resulting from the external voltage.
dc.description.departmentPhysics and Astronomy
dc.identifierdoi: 10.3390/catal11121441
dc.identifier.citationCatalysts 11 (12): 1441 (2021)
dc.identifier.urihttps://hdl.handle.net/20.500.12588/778
dc.rightsAttribution 4.0 United States
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectdouble-perovskite oxide
dc.subjectthin film
dc.subjectoxygen sensing
dc.subjectnegative resistance
dc.titleAnomaly Negative Resistance Phenomena in Highly Epitaxial PrBa0.7Ca0.3Co2O5+δ Thin Films Induced from Superfast Redox Reactions
dc.typeArticle

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