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Synthesis of Truncated‐Octahedral Pt–Pd Nanocrystals Supported on Carbon Black as a Highly Efficient Catalyst for Methanol Oxidation
Author(s) -
Chu Y.Y.,
Wang Z.B.,
Dai Z.,
Gu D.M.,
Yin G.P.
Publication year - 2014
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.201300117
Subject(s) - catalysis , ethylene glycol , methanol , materials science , transmission electron microscopy , dangling bond , nanocrystal , chemical engineering , inorganic chemistry , crystallography , chemistry , nanotechnology , organic chemistry , metallurgy , silicon , engineering
A novel PtPd/C nanocrystals catalyst with truncated‐octahedral structure has been successfully prepared by ethylene glycol reduction to induce anisotropic growth in an isotropic medium by adding a small amount of Fe 3+ species. Its structure, composition, and morphology are characterized by X‐ray diffraction, transmission electron microscopy, and scanning transmission electron microscopy‐energy dispersive spectroscopy elemental maps, respectively. The electrochemical measurements demonstrate that the highly dispersed and uniform PtPd/C nanocrystals have excellent poisoning tolerance, significantly higher electrocatalytic activity and durability for the methanol oxidation, as compared to solid solution PtPd/C and Pt/C catalysts. This may be ascribed to the stepped atoms and dangling bonds, which served as active sites for breaking chemical bonds during oxidation–reduction reaction; the high density of preferred crystal planes of (111) facets greatly enhanced the oxidation of poisonous residues during reaction.