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Enhanced Electrocatalysis for Methanol Oxidation on Ordered {[PdPW 11 O 39 ] 5– /Pt/PAMAM} n Multilayer Composites
Author(s) -
He X.,
Chen L.,
Li Z.,
Zhang X.,
Ma A.,
Lin S.
Publication year - 2015
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201400005
Subject(s) - x ray photoelectron spectroscopy , materials science , cyclic voltammetry , nanocomposite , electrocatalyst , nanoparticle , scanning electron microscope , chemical engineering , methanol , catalysis , nuclear chemistry , nanotechnology , electrochemistry , composite material , electrode , chemistry , organic chemistry , engineering
The {[PdPW 11 O 39 ] 5– /Pt/PAMAM} n multilayer composites constructed from G4.0 Amino‐terminated poly (amidoamine) dendrimer (PAMAM), Pt and Keggin‐type palladium(II)‐substituted polyoxometalates anion ([PdPW 11 O 39 ] 5– ) were prepared via layer by layer electro‐depositing technique. The X‐ray photoelectron spectroscopy (XPS), X‐ray diffraction (XRD), and field emission scanning electron microscope (FE‐SEM) characterization indicate that the Pt nanoparticles have been anchored on the as‐prepared nanocomposites. And the morphologies of Pt nanoparticles are influenced by deposition potential, the number of layers of {[PdPW 11 O 39 ] 5– /Pt/PAMAM} n multilayer nanocomposites, and the existence of PAMAM. The electrocatalytic properties and stability of {[PdPW 11 O 39 ] 5– /Pt/PAMAM} n multilayer nanocomposites were investigated by cyclic voltammetry. Experimental investigation results reveal that PAMAM is a good support for Pt nanoparticle growth due to its interior cavity structure and high stability. [PdPW 11 O 39 ] 5– play an important role to prevent intermediate product (mainly as CO) in the methanol oxidation from poisoning the as‐prepared catalyst. The {[PdPW 11 O 39 ] 5– /Pt/PAMAM} 3 /GC shows better electrocatalytic properties, stability, and CO tolerance ability than Pt/GC and {Pt/PAMAM} 3 /GC fabricated by similar electrodeposition processes.