New modified electrodes (ME) were prepared in coating carbon electrodes with cerium poly(allyl ether p-benzenesulfonate) that display reactivity for acetic aldehyde and benzylalcohol oxidation. Electrolysis of benzylalcohol gave benzaldehyde and benzoic acid. These electrodes have been proven to be very stable and resistant and they have the advantage to perform easily in function in the pam position of the benzene ring that opens many possibilities for the use of ME of the ion exchange type.