Palladium-modified polysulfonic acid-doped polyaniline layers for hydrazine oxidation in neutral solutions

► Polysulfonic acid-doped polyaniline layers are used for electroless deposition of Pd. ► Finely dispersed Pd nanoparticles are obtained at the polymer surface. ► The Pd nanoparticles are electroactive for hydrazine oxidation in neutral solution. ► Linear current response is found for 0.04 to 1 mmol l−1 hydrazine concentrations.