Different interesting enhanced influence from polyaniline and poly(o-toluidine) on electrocatalytic activities of Pt on them toward electrooxidation of methanol. (16th August 2018)

• Record Type: Journal Article
• Authors: Zhang, Guirong; Tan, Lushi; Cheng, Haiyan; Li, Fenpei; Liu, Xiangqing; Lu, Jiaxing
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 33(2018)
• Page Start: 16049
• Page End: 16060
• Publication Date: 2018-08-16
• Subjects: Conducting polymer -- Polyaniline -- Poly(o-toluidine) -- Methanol oxidation -- Platinum nanoparticles; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.07.046
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Polyaniline (PANI) and poly( o -toluidine) (POT) with various film thickness were electropolymerized using potentiostatic method at the surface of GC electrode. The two conducting polymers were characterized by CV, in situ UV–vis spectroscopy and electrochemical impedance spectroscopy. Two composite catalysts (Pt/PANI/GC and Pt/POT/GC) with various film growth charge have been fabricated by the electro deposition of Pt on the PANI/GC and POT/GC at −0.1 V. then they were used for the electrooxidation of methanol in 0.5 M H2 SO4 containing 1.0 M methanol. The properties of both the polymers change with the increase of film growth charge. As-formed composite catalysts were characterized by SEM and the electrochemical methods. The Pt nanoparticles deposited at −0.1 V exhibit thorns morphology and good dispersion on the POT with the film growth charge of 4.5 mC. The electrocatalytic activity for methanol oxidation of Pt/POT/GC is higher than Pt/PANI/GC for all the film charge, and they both exhibit the largest electrocatalytic activity at film charge of 4.5 mC. The present study shows that Pt/POT/GC would be a promising choice for methanol electrooxidation in comparison with Pt/PANI/GC. Highlights: The difference of electropolymerizaton behavior between ANI and OT causing different Pt deposition on between PANI and POT. The morphology of Pt nano particles on poly(o-toluidine) is different from that of Pt nano particles on polyaniline. ECSA for Pt nano particles on poly(o-toluidine) is larger than that of Pt nano particles on polyaniline. Pt/POT/GC would be a promising choice for methanol electro oxidation with regard to Pt/PANI/GC.