MICROELECTRODE VOLTAMMETRIC MEASUREMENT OF HETEROGENEOUS ELECTRON-TRANSFER RATE CONSTANTS FOR REDUCTION OF 7,7,8',8'-TETRACYANOQUINODIMETHANE IN POLYMER ELECTROLYTES

This paper presents a microelectrode voltammetric determination of het erogeneous electron transfer rate constants (k(s)) and diffusion coeff icients (D) of 7,7,8',8 '-tetracyanoquinodimethane (TCNQ) in polyelect rolytes. The diffusion coefficients are estimated using cyclic voltamm etry under linear diffusion conditions, and the heterogeneous electron transfer rate constants are obtained under mixed linear and radial di ffusion in the polyelectrolyte. k(s) and D increase with increasing te mperature, and the activation barriers of the electrode reaction for r eduction of TCNQ are obtained. On the other hand, the dependencies of D and k(s) of TCNQ on the size and charge of the counterion are compar ed in the polyelectrolyte. (C) 1998 Elsevier Science Ltd. All rights r eserved.