Fig. 6. (a) Cyclic voltammograms on raw-Ta3N5 (orange), TaCl5–Ta3N5 (pink), heated-Ta3N5 (blue) and necked-Ta3N5 (black) electrodes for the reduction of ferricyanide in NaOH + K3Fe(CN)6 aqueous solution. (b) The plots of capacitive current to scan rate for the Ti foil (grey), raw-Ta3N5 (orange), TaCl5–Ta3N5 (pink), heated-Ta3N5 (blue) and necked-Ta3N5 (black) electrodes. The slopes are shown beside the curves.
