期刊论文详细信息
Catalysts
Anomaly Negative Resistance Phenomena in Highly Epitaxial PrBa0.7Ca0.3Co2O5+δ Thin Films Induced from Superfast Redox Reactions
Myung-Hwan Whangbo1  Shengli Pang2  Chonglin Chen2  Yudong Xia2  Xing Xu2  Yumei Luo3  Fen Xu3  Lixian Sun3 
[1] Department of Chemistry, North Carolina State University, Raleigh, NC 27695, USA;Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX 78249, USA;Guangxi Collaborative Innovation Center of Structure and Property for New Energy, Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China;
关键词: double-perovskite oxide;    thin film;    oxygen sensing;    negative resistance;   
DOI  :  10.3390/catal11121441
来源: DOAJ
【 摘 要 】

Thin 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.

【 授权许可】

Unknown   

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