NDLI: Small-sized and high-dispersed WN from [SiO4(W3O9)4]4− clusters loading on GO-derived graphene as promising carriers for methanol electro-oxidation

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Energy & Environmental Science Vol - 7 Issue - 5

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Small-sized and high-dispersed WN from [SiO₄(W₃O₉)₄]⁴⁻ clusters loading on GO-derived graphene as promising carriers for methanol electro-oxidation

Content Provider	Royal Society of Chemistry (RSC)
Author	Tian, Chungui Wu, Aiping Sun, Li Wang, Bo Yin, Jie Wang, Lei Fu, Honggang Yan, Haijing
Copyright Year	2014
Abstract	The small size and high dispersion of cocatalysts on supports are essential to increase the chance to contact with a Pt catalyst for promoting the synergistic effect. In this paper, we report the synthesis of the small-sized WN nanoparticles (NPs) loading on GO-derived graphene (denoted as graphene for simplicity) by using heteropoly acid H4[SiO4(W3O9)4] (SiW12) clusters as a W source. The SiW12 clusters are anchored on the polyethyleneimine (PEI)-modified GO through a hydrothermal process. After the nitridation with NH3, the small-sized and well dispersed WN NPs of 2–3 nm are obtained. The ternary Pt–WN/graphene catalysts are fabricated by an EG reduction method. The intimate contact and intensive interaction between Pt and WN are verified by TEM, XRD, XPS and XAFS tests. Due to the above characteristics, the Pt–WN/graphene catalyst exhibits a remarkably enhanced activity and durability toward methanol electrocatalytic oxidation. The mass activity of Pt–WN/graphene (531.5 mA mgPt−1) is 2.45, 2.88 and 3.70 times that of Pt/graphene, Pt/C(JM) and Pt/Vulcan catalysts, respectively. Furthermore, the ternary Pt–WN/graphene catalyst shows excellent resistance to CO poisoning and good stability. The high activity of Pt–WN/graphene is mainly attributed to the enhanced synergistic effect benefited from the intimate contact and intensive interaction of Pt with WN NPs.
Starting Page	1939
Ending Page	1949
Page Count	11
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	7
Issue Number	6
Journal	Energy & Environmental Science
DOI	10.1039/c4ee00324a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Dispersion relation Graphene Acid Polyethylenimine Hydrothermal circulation Ammonia Intimate Contact Transmission electron microscopy X-ray crystallography Methanol Avro Vulcan
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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