Semiconductor-Ionic Nanocomposite La0.1 Sr0.9 MnO3-δ -Ce0.8 Sm0.2 O2-δ Functional Layer for High Performance Low Temperature SOFC

Materials
Zhaoqing WangHao Wang

Abstract

A novel composite was synthesized by mixing La0.1Sr0.9MnO3-δ (LSM) with Ce0.8Sm0.2O2-δ (SDC) for the functional layer of low temperature solid oxide fuel cell (LT-SOFC). Though LSM, a highly electronic conducting semiconductor, was used in the functional layer, the fuel cell device could reach OCVs higher than 1.0 V without short-circuit problem. A typical diode or rectification effect was observed when an external electric force was supplied on the device under fuel cell atmosphere, which indicated the existence of a junction that prevented the device from short-circuit problem. The optimum ratio of LSM:SDC = 1:2 was found for the LT-SOFC to reach the highest power density of 742 mW·cm-2 under 550 °C The electrochemical impedance spectroscopy data highlighted that introducing LSM into SDC electrolyte layer not only decreased charge-transfer resistances from 0.66 Ω·cm² for SDC to 0.47⁻0.49 Ω·cm² for LSM-SDC composite, but also decreased the activation energy of ionic conduction from 0.55 to 0.20 eV.

References

Apr 29, 2000·Nature·J B Goodenough
Feb 25, 2003·Chemical Society Reviews·R Mark Ormerod
Nov 19, 2011·Science·Eric D Wachsman, Kang Taek Lee
Mar 10, 2012·Journal of Nanoscience and Nanotechnology·Bin Zhu
Oct 9, 2015·Nature Communications·Sang Mo YangJudith L MacManus-Driscoll

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