A Study On The Preparation Of Polyaniline Nanomposite Materials And Their Electrocatalytic Performance

Polyaniline(PANI) with porous structure and high surface area are usually used as carrier and the noble metal particles incorporated on the carrier serves as catalyst. However, PANI itsself has low electrocal conductivity and poor stability in solution, so its application is limited.The electrical conductivity and mechanical properties of the complex materals have been improved after adding carbon nanotubes into the polyaniline and their catalytic properties have been further improved by depositing,dispersing metal particles onto Polyaniline/carbon nanotubes (PANI/CNTs) composite materials.As a result, the application potenial will be extended.In this paper, the processing conditions how to prepare PANI,PANI/MWCNTs composite membrane have been studied.Composite materails have been used as matrix to deposite Pt,Au nanoparticles by constant potential deposition and pulse voltammetry and their catalytic properties to formaldehyde were discussed.1.The porous,mesh structure of PANI has been obtained by controlling the electrochemical conditions in different acids.The effects of different acid medium on the membrane morphology were studied;The single-wall,multi-walled carbon nanotubes and aniline have been mixed by heating to disperse single-wall, multi-walled carbon nanotubes.It was confirmed that the structure of aniline and carbon nanotubes were not further damaged through this decentralization approach after char-acterization of SEM,Raman,UV,IR,cyclic voltammetry.The porous,mesh structure of PANI/MWCNTs composite materals were obtained by controlling the electrochemical reaction conditions in sulfuric acid.It was confirmed that the conductivity of nanocomposite materals increased after adding carbon nanotubes into PANI by SEM images,cyclic voltammetry characterization and measurement of electrical conductivity of nanocomposite materials.2.PANI,PANI/MWCNTs nanocomposite materals have been fabricated by cyclic voltammetry. Through controlling the deposition potential,Pt particles have been uniformly dispersed on the film surface of nanocomposite material.EDS analysis confirmed that Pt quality per unit area have been improved after adding carbon nanotube into PANI.possible reaction mechanism of Pt-modified PANI, PANI/MWCNTs nanocomposite materals have been proposed.There were higher oxidation current and lower oxidation voltage on Pt-modified PANI/MWCNTs nanocomposite materals electrode than Pt modified PANI electrode and pure Pt electrode When formaldehyde with the same concentration was oxidated on Pt-modified PANI and Pt-modified PANI/MWCNTs composite electrode and the pure Pt electrodes,respectively.There was better stability in the formaldehyde solution of Pt-modified PANI/MWCNTs nanocomposite electrode than Pt-modified PANI electrode, so there was higher dispersion capacity of Pt particles on the nanocomposite material of Pt-modified PANI/MWCNTs by adding MWCNTs into the PANI and catalytic performance and stability of the nanocomposite material were improved.3.Au-modified PANI, Au-modified PANI/MWCNTs nanocomposite materials and Pt,Au-modified PANI/MWCNTs nanocomposite materials have been prepared by pulse voltammetry, constant potential deposition and cyclic voltammetry. It was confirmed that the Pt, Au nanoparticles were uniformly dispersed on the membrane surface by analysis of potentiostatic deposition I-t curves,SEM images,EDS spectra. Pt content per unit area have been improved after adding carbon nanotube into PANI and possible reaction mechanisms have been explained.