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Thermal, electrical, and electrochemical properties of Lanthanum-doped Ba0.5Sr0.5 Co0.8Fe0.2O3–δ by Shuyan Li; Zhe Lü; Xiqiang Huang; Bo Wei; Wenhui Su is a Materials Science article available to read on EtoBox.

What is Thermal, electrical, and electrochemical properties of Lanthanum-doped Ba0.5Sr0.5 Co0.8Fe0.2O3–δ about?

Crystal structure, thermogravimetry (TG), thermal expansion coefficient (TEC), electrical conductivity and AC impedance of (Ba 0.5 Sr 0.5 ) 1-x La x Co 0.8 Fe 0.2 O 3-d (BSLCF; 0.05pxp0.20) were studied in relation to their potential use as intermediate temperature solid oxide fuel cell (IT-SOFC) cathode. A single cubic pervoskite was observed by X-ray diffraction (XRD). The TEC of BSLCF was increasing slightly with the increasing content of La, and all the compounds showed abnormal expansion at high temperature. Proved by the TG result, it was associated with the loss of lattice oxygen. The electrical conductivity, which is the main defect of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-d (BSCF), was improved by La doping, e.g., the compound of x 1⁄4 0.20 demonstrated a conductivity of s 1⁄4 376 S cm À1 at 392 1C. The increase of electrical conductivity resulted from the increased concentration of charge carrier induced by La doping. In addition, the AC impedance revealed the better electrochemical performance of BSLCF. For example, at 500 1C, the sample with composition x 1⁄4 0.15 yielded the resistance values of 2.12 O cm 2 , which was only 46% of BSCF.

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Author

Shuyan Li; Zhe Lü; Xiqiang Huang; Bo Wei; Wenhui Su

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0022-3697)

Published

2007

Language

EN

Field

Materials Science (Physical Sciences)