Reaction, diffusion and migration in conducting polymer electrodes: analysis of the steady-state amperometric response

The processes of reaction, diffusion and electromigration of a charged subs trate within an electronically conducting polymer film deposited on an iner t supporting electrode are examined in terms of a quantitative analysis and solution of the pertinent differential equations. An analytical expression for the concentration profiles of substrate within the polymer layer is de rived and a theoretical expression for the corresponding steady-state amper ometric current response is presented. The transport and kinetics of the su bstrate are discussed in terms of a dimensionless reaction/diffusion parame ter gamma and a migratian/diffusion parameter beta.