Enhanced electrochemical activity using vertically aligned carbon nanotube electrodes grown on carbon fiber
AUTOR(ES)
Morais, Evandro Augusto de, Alvial, Gaston, Longuinhos, Rafael, Figueiredo, Jose Marcos Andrade, Lacerda, Rodrigo Gribel, Ferlauto, Andre Santarosa, Ladeira, Luiz Orlando
FONTE
Materials Research
DATA DE PUBLICAÇÃO
26/08/2011
RESUMO
Vertically aligned carbon nanotubes were successfully grown on flexible carbon fibers by plasma enhanced chemical vapor deposition. The diameter of the CNT is controllable by adjusting the thickness of the catalyst Ni layer deposited on the fiber. Vertically aligned nanotubes were grown in a Plasma Enhanced Chemical Deposition system (PECVD) at a temperature of 630 ºC, d.c. bias of -600 V and 160 and 68 sccm flow of ammonia and acetylene, respectively. Using cyclic voltammetry measurements, an increase of the surface area of our electrodes, up to 50 times higher, was observed in our samples with CNT. The combination of VACNTs with flexible carbon fibers can have a significant impact on applications ranging from sensors to electrodes for fuel cells.
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