The MIP and NIP films were deposited under galvanostatic conditions. Chronocoulometric curves recorded during these electropolymerizations are shown on Figure . This process occurred to be more reproducible than electropolymerization under potentiostatic conditions due to better stability of potential over the measurement. Under these conditions thick enough layer was obtained to form a continuous film over whole surface of carbon fibers. Moreover, polymer film was not too thick, thus, pores in the carbon paper were still fully open. Therefore, diffusion of neither redox probe ions nor MTZ into the pores of the carbon paper were blocked. After the MIP film deposition, the gray carbon-paper electrode turned deep-black proving that whole electrode surface was modified.