High capacity SiO2-Graphite composite electrodes with chemically incorporated metal MHCFs for electrochemically switched alkaline cation exchange

Bulk metal hexacyanoferrate (MHCF) has been synthesized within the porous microstructure of conductive composite materials using a simple chemical procedure. The composite materials consist of micrometer-size graphite particles encapsulated in a SiO2 solid matrix using a sol-gel technique. A strong...

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Veröffentlicht in:Journal of the Electrochemical Society 2004, Vol.151 (9), p.87-D92
Hauptverfasser: REYES-GOMEZ, J, MEDINA, J. Antonio, JEERAGE, Kavita M, STEEN, William A, SCHWARTZ, Daniel T
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Sprache:eng
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Zusammenfassung:Bulk metal hexacyanoferrate (MHCF) has been synthesized within the porous microstructure of conductive composite materials using a simple chemical procedure. The composite materials consist of micrometer-size graphite particles encapsulated in a SiO2 solid matrix using a sol-gel technique. A strong electrochemical signal from the chemically treated composites is associated with electrochemically switched alkaline-cation exchange. The exchange capacity of these composite electrodes exceeds by more than two orders of magnitude that of thin-film MHCF electrodes of comparable dimensions. The effects of some fabrication parameters on the cation-exchange capacity and on the distribution of the hexacyanoferrate within the composite electrodes are presented.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.1776590