Polyaniline was possibly doped with cresol-sulfonic acid, though it fa
iled to electrodeposit the polymer from solutions of aniline in cresol
-sulfonic acid. The presence of cresol-sulfonate anions changed the re
dox peaks of the polymer in their positions and heights. Catalytic oxi
dation of cresol-sulfonic acid was observed on polyaniline-filmed elec
trodes at potentials of a limited interval.