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Effect of nitrogen-containing functionalization on the electrocatalytic activity of PtRu nanoparticles supported on carbon nanotubes for direct methanol fuel cells

Paper ID Volume ID Publish Year Pages File Format Full-Text
45865 46426 2014 10 PDF Available
Title
Effect of nitrogen-containing functionalization on the electrocatalytic activity of PtRu nanoparticles supported on carbon nanotubes for direct methanol fuel cells
Abstract

•N-containing functionalized CNTs as effective support for PtRu catalysts.•N-group of functionalization agents promotes methanol oxidation reaction.•Activity of PtRu catalysts depends on distribution of N-groups.

PtRu nanoparticles (NPs) with average size of ∼3 nm are supported onto poly(diallyldimethylammonium chloride) (PDDA), polyethylenimine (PEI), 1-aminopyrene (1-AP or AP), and terahydrofuran (THF) functionalized multi-walled carbon nanotubes (CNTs) using microwave assisted self-assembly method. The PtRu/CNTs catalysts are extensively characterized by TGA, TEM, XRD, XPS, cyclic voltammetry and chronoamperometry. Non-covalent functionalization substantially improves the dispersion and distribution of PtRu NPs on CNTs. Most important, the results demonstrate that nitrogen-containing functional groups of the functionalization agents play a critical role in the electrocatalystic activity of PtRu NPs supported on CNTs. PtRu NPs supported on PEI, AP and in less extent PDDA functionalized CNTs exhibited significantly higher electrocatalystic activity and stability for the electro-oxidation of methanol as compared with PtRu supported on THF-CNTs and conventional acid-treated CNTs. The superior activity of PtRu supported on functionalized CNTs is most likely due to the strong interaction of the electron rich nitrogen-containing functional groups of the functionalization agents such as PEI, AP and in less extend PDDA and the PtRu NPs assembled on CNTs.

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Keywords
Fuel cells; PtRu nanoparticles; Polyelectrolyte; Solvent; Nitrogen-containing functionalization; Methanol oxidation reaction
First Page Preview
Effect of nitrogen-containing functionalization on the electrocatalytic activity of PtRu nanoparticles supported on carbon nanotubes for direct methanol fuel cells
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 158–159, October 2014, Pages 140–149
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis