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Effects of Bi doping on the microstructure, electrical and electrochemical properties of La2-xBixCu0.5Mn1.5O6 (x = 0, 0.1 and 0.2) perovskites as novel cathodes for solid oxide fuel cells.
- Source :
-
Electrochimica Acta . Mar2017, Vol. 229, p429-437. 9p. - Publication Year :
- 2017
-
Abstract
- Bi-doped La 2- x Bi x Cu 0.5 Mn 1.5 O 6 (LBCM- x , x = 0, 0.1 and 0.2) were synthesized as potential cathode materials for intermediate-temperature solid oxide fuel cells. The effects of 6s 2 lone pair electrons on the electrical and electrochemical properties of LBCMs were investigated. The results reveal that Bi 3+ affects the properties of LBCMs in two ways. First, Bi doping can promotes the formation of oxygen vacancies, which is consistent with the results of first-principles calculations. The formation of oxygen vacancies can increase the amount of Mn 3+ /Mn 4+ pairs for the hopping of electrons and accelerate the oxygen transportation. Second, Bi doping can affect the microstructure of LBCMs and make LBCM-0.1 has the smallest grain size. The dual effects of Bi doping result in the highest electrical conductivity (143.91 Scm −1 ) as well as the lowest polarization resistance (0.101 Ωcm 2 ) of LBCM-0.1 at 850 °C and make it a superior cathode candidate for solid oxide fuel cells. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 229
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 121359075
- Full Text :
- https://doi.org/10.1016/j.electacta.2017.01.153