Electron transfer kinetics at single-walled carbon nanotube paper: The role of band structure

The role of band structure of individual tubules from single-walled carbon nanotube paper in the electron transfer process was considered within Gerischer-Marcus theory using Raman scattering spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy data. A heterogeneous electron transfer rate of 1.06 x 10(-3) cm s was observed for ferri/ferrocyanid. A position of the Raman radial breathing mode was used for determination of the chiral vectors of tubules being in resonance with excitation laser light of 1.17 eV. For these tubules, the calculated electron transfer rates are similar. It has been shown that nanotube electronic states away from the Fermi level contribute to the electron transfer kinetics due to the broad distribution of the redox states in electrolyte. (C) 2011 Elsevier B.V. All rights reserved.