NDLI: Well-dispersed and size-tuned bimetallic PtFe<sub><i>x</i></sub> nanoparticle catalysts supported on ordered mesoporous carbon for enhanced electrocatalytic activity in direct methanol fuel cells

Content Provider	Royal Society of Chemistry (RSC)
Author	Yin, Longwei Xiang, Dong
Copyright Year	2012
Abstract	Ordered mesoporous carbon (OMC) supported well-dispersed PtFex nanoparticles with a controllable size distribution were prepared via a modified polyol synthesis route, using hexachloroplatinic acid and ferric chloride as Pt and Fe source, and ethylene glycol as a reducing agent. The catalytic activities relevant to direct methanol fuel cell of the PtFex/OMC composites were investigated using cyclic voltammetry, single-cell proton exchange membrane fuel cell (PEMFC) test and electrochemical impedance spectroscopy (EIS) technique. Due to the existence of more Pt0 species and Fe ion corrosion caused by the formation of the alloyed PtFex catalyst, Pt0 can provide the more active sites for methanol oxidation reaction, and the methanol oxidation activity of the PtFex/OMC electrode is evidenced to be enhanced by the increased anodic peak current with increasing the incorporation content of Fe. The oxygen reduction reaction (ORR) current density of 0.662 A cm−2 and power density of 237.2 mW cm−2 generated by the PtFe3/OMC sample are more than two times the values of 0.32 mA cm−2 and 102.6 mW cm−2 by the Pt/OMC sample. The PtFe3/OMC catalyst in 0.5 M H2SO4 + 1 M CH3OH displays the highest specific catalytic activity of 100.6 mA m−2, which is almost 3 times lower than that of 283.7 mA m−2 in 0.5 M H2SO4. The enhanced higher activity for the PtFe3/OMC sample can be firstly attributed to a highly homogeneous dispersion of the PtFe3 nanoparticles on the mesoporous channels within OMC, such PtFe3 nanoparticles with a diameter of 3.3 nm can accelerate the formation of Pt–OH groups. Meanwhile, the alloyed PtFe3 nanoparticles can provide a lower onset potential for the electrooxidation of CO/H2 than that of pure Pt, and would contribute more to the promotion of C–H breaking and COad tolerance. Furthermore, the larger surface area, the favorable pore structure and the structural integrity between the PtFe3 nanoparticles and the OMC matrix, will effectively facilitate the transportation of reactants and products in liquid electrochemical reactions.
Starting Page	9584
Ending Page	9593
Page Count	10
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	22
Issue Number	19
Journal	Journal of Materials Chemistry
DOI	10.1039/c2jm16641k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	OMC Mesoporous material Carbon Polyol Acid Iron(III) chloride Ethylene glycol Redox Direct methanol fuel cell Cyclic voltammetry Proton-exchange membrane fuel cell Electrochemistry Electrical impedance Spectroscopy Ion Corrosion Methanol Electrode Electric current Mitochondrial matrix
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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