Abstract
A functionalised Fe-substituted Keggin Na 14[Fe 4(C 2O 4) 4(H 2O) 2(SbW 9O 33) 2]·60H 2O type POM termed "Fe 4Ox 4" has been successfully immobilised onto carbon electrode surfaces through the employment of conducting polypyrrole films and the layer-by-layer (LBL) technique. For the POM doped polypyrrole films the redox systems associated with the POM's tungsten-oxo framework was not apparent upon redox cycling, however a reversible redox couple associated with the Fe III/II redox system was clearly seen within the pH range 2-7. Organised multilayer assemblies were constructed by the employment of the layer by layer (LBL) technique through alternating anionic Fe 4Ox 4 layers and cationic Ru II metallodendrimers with poly(diallyldimethylammonium chloride) (PDDA) employed as an initial base layer. Stable redox couples associated with both the Fe III/II and tungsten-oxo framework, for the Fe 4Ox 4 POM, and the Ru III/II for the metallodendrimer, were clearly observed upon layer construction and redox switching within the pH domain of 2-7. The resulting multilayer assembly showed good stability towards redox cycling. Further investigations into the multilayer assembly were undertaken by determining it is charge transfer resistance using AC-impedance voltammetry. The layer also showed catalytic ability towards the reduction of H 2O 2 at pH 6.5.
Original language | English |
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Pages (from-to) | 1-7 |
Number of pages | 7 |
Journal | Electrochimica Acta |
Volume | 59 |
DOIs | |
Publication status | Published - 1 Jan 2012 |
Keywords
- Conducting polymer
- Immobilisation
- LBL
- Polyoxometallate
- Sandwich type