Bimetallic PtRu Nanoparticles Supported on Functionalized Multiwall Carbon Nanotubes as High Performance Electrocatalyst for Direct Methanol Fuel Cells

Abstract

PtRu nanoparticles (NPs) supported on acid treated multiwall carbon nanotubes (Pt 1 Ru 1 / MWCNTs) were prepared by a modi¯ed polyol method without adding any other surfactant or protective agent. The structural and compositional properties of the as-obtained samples were characterized by transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), X-ray di®raction (XRD) and X-ray photoelectron (XPS) spectroscopy. The electrocatalytic performance of the catalyst was evaluated by cyclic voltammetry (CV), CO stripping voltammetry and chronoamperometry, indicating a high catalytic activity, excellent CO tolerance and stability for methanol oxidation. Interestingly, a series of accurate controllable experiments have been designed to explore the enhancement mechanism of Pt 1 Ru 1 /MWCNTs for methanol oxidation reaction. Most importantly, Pt 1 Ru 1 /MWCNTs composites were used as an anode catalyst in the direct methanol fuel cells (DMFCs) exhibiting outstanding power density (126.1 mW/cm 2 Þ 1.7 times higher than that of the commercial catalyst of Pt 1 Ru 1 /C (74.1 mW/cm 2 Þ (E-TEK).

Nonenzymatic Electrochemical Immunosensor Using Ferroferric Oxide–Manganese Dioxide–Reduced Graphene Oxide Nanocomposite as Label for α-Fetoprotein Detection

“…Up to now, various metal and metal oxide nanomaterials have been found to exhibit intrinsic peroxidase-like activities, such as Au, 7,8 Pt, 9,10 Pd, 11 CuO, 12,13 The material used to modify electrode is another key point for ultrasensitive detection in electrochemical immunosensors. Multi-walled carbon nanotubes (MWCNTs) and graphene oxide (GO) are widely used as transducers for sensing enhancement because of their unique nanostructures and excellent physical properties.…”

Oxidação eletroquímica do metanol em eletrólito alcalino por intermédio de eletrocatalisadores PtRuIn/C preparados pelo método de redução por borohidreto de sódio

“…Neste caso, sugere-se que há maior quantidade de sítios ativos de Platina por área, o que facilita a adsorção do metanol. Já foi visto em literatura[69][70] que o Rutênio favorece a oxidação de intermediários e que a razão atômica entre os metais Pt e Ru, são de extrema importância para se obter uma eficiência catalítica satisfatória. Além do que, como anteriormente foi comentado, a composição 50:50, tem mostrado eficiência para aplicação em células a combustível do tipo PEMFC[68], sendo aceita de forma bem difundida para a categoria DMFC[81][82].…”