2003 Volume 71 Issue 12 Pages 1117-1119
The performance enhancing effect of a graphitized carbon fiber treated by Ag film deposition has been examined by impedance spectroscopy analysis. The surface modification was performed by depositing Ag films in vacuum at various thicknesses, followed by heat-treatment. For the case of a 200 Å-thick film the spectra indicated that both the film resistance and the charge transfer resistance increased. The heat-treated sample showed larger film resistance but smaller charge transfer resistance, implying that the increase in the reaction rate is caused by the activation of the reaction site.