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Porous nickel MCFC cathode coated by potentiostatically deposited cobalt oxide: III. Electrochemical behaviour in molten carbonate

Authors :
Escudero, M.J.
Ringuedé, A.
Cassir, M.
González-Ayuso, T.
Daza, L.
Source :
Journal of Power Sources. Sep2007, Vol. 171 Issue 2, p261-267. 7p.
Publication Year :
2007

Abstract

Abstract: A cobalt oxide coating was deposited on porous nickel by a potentiostatic electrochemical technique and studied in molten (Li0.52Na0.48)2CO3 eutectics at 650°C under an atmosphere of CO2:Air (30:70). The structural and morphological characteristics of this coating before and after immersion in the molten electrolyte were described in a previous paper, showing that the initial Co3O4 layer is rapidly transformed into LiCoO2 and afterwards probably into LiCo1−y Ni y O2. In the present part, the electrical and electrochemical behaviour of this promising novel MCFC cathode material was thoroughly analysed during 50h by impedance spectroscopy. A porous nickel cathode was tested in the same conditions and taken as a reference. The oxidation and lithiation reactions are accelerated by the presence of cobalt. The charge transfer resistance is higher with the coated cathode but the diffusion resistance through this new material is lower in comparison with the state-of-the-art cathode. [Copyright &y& Elsevier]

Details

Language :
English
ISSN :
03787753
Volume :
171
Issue :
2
Database :
Academic Search Index
Journal :
Journal of Power Sources
Publication Type :
Academic Journal
Accession number :
26488401
Full Text :
https://doi.org/10.1016/j.jpowsour.2007.06.013