Platinum Particles Embedded into Nanowires of Polyaniline Doped With Poly(Acrylic Acid-co-Maleic Acid) as Electrocatalyst for Methanol Oxidation

摘要

Polyaniline-poly(acrylic acid-co-maleic acid) (PANI-PAMA) with a nanowire network structure isprepared using a doping-dedoping-redoping route. Platinum (Pt) particles are deposited into PANI andPANI-PAMA nanowire network structures via a potentiostatic process to obtain PANI-Pt and PANI- PAMA-Pt composite electrodes, respectively. Functional group analysis is conducted using Fouriertransform infrared (FT-IR) spectroscopy and the morphology of PANI-PAMA is determined usingscanning electron microscopy (SEM). SEM images reveal that PANI-PAMA is composed of highlyporous nanowires. The structures of PANI-Pt and PANI-PAMA-Pt composite electrodes are furthercharacterized using X-ray photoelectron spectroscopy (XPS), electron dispersive element analysis(EDS), and Auger electron spectroscopy (AES). The EDS and AES results indicate that the Pt isdispersed uniformly in the PANI-PAMA matrix. The cyclic voltammetry (CV) results andchronopotentiometry measurements demonstrate that the electrocatalytic activity and stability formethanol oxidation of the PANI-PAMA-Pt composite are higher than those of PANI-Pt.