Polyaniline-Poly (o-methoxyaniline) composite films as supports of Pt-Ru nanoparticles for formic acid electro-oxidation

摘要

Polyaniline-Poly (o-methoxyaniline) (PANI-POMAN) composites are synthesized using cyclicvoltammetry (CV) methods. Platinum (Pt) and Ruthenium (Ru) bimetal nanoparticles are co-depositedonto the PANI-POMAN film to produce a durable and efficient electro-active catalyst for formic acidoxidation. The morphology of composite/catalysts is characterized by scanning electron microscopy(SEM) and transmission electron microscopy (TEM). The electrocatalytic activity of the catalyststoward formic acid oxidation is investigated using CV and other electrochemical methods. The metalnanoclusters having average particle size of 5 nm as measured directly from TEM images. The PANI- POMAN supported bimetallic catalyst exhibits two times higher catalytic activity than that for purePANI supported catalyst, and has a much better stability. The high activity is due to the unique porousand layered structure, high surface area, and uniform distribution of Pt-Ru nanoparticles. Theenhanced stability is attributed to the introduction of Ru metal into Pt catalyst to display a synergisticeffect, and the ability to reduce the propensity of poisoning of the catalyst by the intermediateproducts.