Journal
ELECTROCHIMICA ACTA
Volume 88, Issue -, Pages 107-111Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.10.060
Keywords
Tungsten trioxide; Microsphere; Platinum; Electrocatalytic activity; Methanol electro-oxidation
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Funding
- National Natural Science Foundation of China [21203168]
- Program for New Century Excellent Talents in University of Ministry of Education of China [NCET-11-1081]
- Program for Zhejiang Leading Team of Science and Technology Innovation [2009R50020]
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Hexagonal tungsten trioxide (hex-WO3) hierarchical microspheres with nest-like pores are synthesized by a facile hydrothermal method. The nest-like-porous (NLP) WO3 hierarchical microspheres with 5-6 mu m in diameters are self-assembled of single-crystal nanowires. The nanowires have lengths of several hundred nanometers and diameters of 5-30 nm; the long axis of nanowire is oriented toward (0 01) direction. The specific surface area of hex-WO3 microspheres is 62 m(2) g(-1). 20 wt.% Pt nanoparticles with similar to 7 nm are loaded onto the WO3 microspheres using a conventional microwave-assisted ethylene glycol (EG) method. The electrocatalytic activity for methanol oxidation of Pt/NLP-WO3 microspheres is investigated by cyclic voltammetry and chronoamperometry. Due to the large tunnels of hexagonal structure and high porous surface morphology, great enhancement of electrochemical performance is achieved. The Pt/NLP-WO3 microspheres are demonstrated to be a promising anode material for direct methanol fuel cells (DMFC). (C) 2012 Elsevier Ltd. All rights reserved.
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