Polyaniline (PANI) is doped with poly(acrylic acid-co-maleic acid) (PAMA) containing HCl to obtain PANI-PAMA film. Platinum particles are deposited into the PANI-PAMA film via electrochemical deposition to obtain PANI-PAMA-Pt composite electrodes. Subsequently, ruthenium oxide (RuO2) particles are incorporated into the composite electrodes by cyclic voltammetry for 20 and 60 cycles to obtain PANI-PAMA-Pt-RuO220 and PANI-PAMA-Pt-RuO260 composite electrodes, respectively. X-ray diffraction analysis explains a decrease in the number of Pt crystalline facets for the incorporation of RuO2 into PANI-PAMA-Pt. Cyclic voltammetry results and chronoamperometric response measurements demonstrate that the PANI-PAMA-Pt-RuO220 electrode has the best activity and stability toward methanol oxidation among the three electrodes.

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