Carbon nanoriber-polystyrene composite electrodes for electroanalytical processes


Rassaei, L., Sillanpaa, M., Bonn, M. J. and Marken, F., 2007. Carbon nanoriber-polystyrene composite electrodes for electroanalytical processes. Electroanalysis, 19 (14), pp. 1461-1466.

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Carbon nanofibers provide an active and well-defined high surface area material for electroanalytical processes. In this study a novel procedure is suggested for compacting carbon nanofiber (CNF) materials (diameter typically 100200 nm) with a polystyrene (PS) binder and additives into highly conducting and re-polishable CNF-PS composite electrodes. Three types of carbon nanofibers (Pyrograf III, 70-200 nra diameter) and a range of compositions are surveyed. A 33 wt% carbon nanofibers in polystyrene electrode provides optimum electrical conductivity and reactivity. The capacitive background current responses from CNF-PS electrodes are lowered (compared to those at glassy carbon) due to the reduced active surface area of the exposed carbon. However, faradaic currents for the reduction of Ru(NH3)(3+)(6) at CNF-PS electrodes are approaching those for diffusion controlled processes. Resistivity measurements - 6 indicate a typical pellet resistance of 200-400 Omega mm(-1) at 3 mm diameter. Anodic stripping voltarnmetry experiments for the Pb2+ System are reported and SEM images of electrodeposited Pbmetal are used to demonstrate the uniformly reactive surface of the CNF-PS electrode. Finally, the redox system 1,1'-ferrocenedicarboxylic acid is immobilized onto the carbon nanofibers and incorporated into the CNF-PS pellet electrodes. The voltammetric signal observed in aqueous media is consistent with release of the oxidized form of ferrocenedicarboxylic acid into solution.


Item Type Articles
CreatorsRassaei, L., Sillanpaa, M., Bonn, M. J. and Marken, F.
DepartmentsFaculty of Science > Chemistry
ID Code4545
Additional InformationID number: ISI:000248202400002


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