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II. Structural, morphological, chemical and electrochemical analysis of nickel covered by electrochemically deposited Co3O4 in molten Li2CO3–Na2CO3 at 650 °C by L. Mendoza; A. Ringuedé; M. Cassir; A. Galtayries is a Engineering article available to read on EtoBox.

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The behaviour of dense nickel substrates coated by electrochemically deposited Co 3 O 4 was analysed in Li 2 CO 3 -Na 2 CO 3 under the usual molten carbonate fuel cell conditions. The cobalt oxide deposit reacts rapidly yielding LiCoO 2 , detected by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Nevertheless, after 1 h of immersion in the carbonate melt, XPS shows that, in the outermost layers (<10 nm), LiCoO 2 is no longer detected and has probably gone from the substrate by mechanical disintegration or chemical transformation in the molten carbonate. The progressive loss of cobalt from the sample is proved by energy dispersive spectroscopy (EDS) and confirmed by all the other techniques (XRD, SEM, XPS) including the open-circuit-potential and cyclic voltammetry. However, the remaining cobalt detected by EDS, even after 48 h of immersion in the melt, could be progressively transformed into a mixed cobalt-nickel compound, which diffuses in the bulk. A significant decrease in the nickel solubility can be noted when using the coated substrate.

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Author

L. Mendoza; A. Ringuedé; M. Cassir; A. Galtayries

Publisher

Elsevier ; Elsevier BV (ISSN 1572-6657)

Published

2005

Language

EN

Field

Engineering (Physical Sciences)