HOẠT TÍNH XÚC TÁC CỦA VẬT LIỆU NANO PtFe/C CHO SỰ OXY HÓA METHANOL TRONG PIN NHIÊN LIỆU MÀNG TRAO ĐỔI PROTON

Abstract

Platinum (Pt) - catalysts have been considered the most efficient catalysts for electrode reactions in proton-exchange membrane fuel cells (PEMFCs). However, the challenge for this catalyst material is its scarcity and high cost. In order to reduce the cost and enhance the catalytic activity, recent studies have focused on making the material in the form of nanoparticles or replacing the Pt metal with another cheaper metal. The Pt-Fe bimetallic nanoparticles supported on nano carbon (Pt_xFe_y/C) have been synthesized by the EG reduction under ultrasonic irradiation. The morphology, crystal structure and specific area of synthesized nanomaterials were characterized by X-Ray diffraction (XRD), transmission electron microscopy (TEM). The electrocatalytic activity for methanol oxidation of the synthesized Pt_xFe_y/C materials and the commercial 10wt.% Pt loaded on activated carbon catalyst (Aldrich Sigma, Pt/C_com) was investigated by cyclic voltammetry (CV) and chronoamperometry (CA). The major size of synthesized metallic particles was around 4 nm. The ratio i_f/i_b  of methanol oxidation of synthetic nanomaterials is greater than 1.