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Role of different platinum precursors on the formation and reaction mechanism of FePt nanoparticles and their electrocatalytic performance towards methanol oxidation

DSpace at IIT Bombay

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Title Role of different platinum precursors on the formation and reaction mechanism of FePt nanoparticles and their electrocatalytic performance towards methanol oxidation
 
Creator SAHU, NK
PRAKASH, A
BAHADUR, D
 
Subject MODIFIED POLYOL PROCESS
FUEL-CELL
MAGNETIC NANOPARTICLES
ACETYLACETONATE
ANISOTROPY
REDUCTION
CATALYST
SIZE
 
Description We report the formation mechanism of FePt nanoparticles (NPs) by a high temperature polyol method using an equimolar ratio of Fe and Pt-precursor with different Pt-precursors. Pt(acac)(2), PtCl2, PtCl4 and H2PtCl6 center dot H2O were used as Pt-precursors and Fe(acac)(3) as the only Fe-precursor. Different stoichiometric compositions along with variation in size were obtained by using different precursors of Pt. Nearly, equiatomic FePt having a size similar to 2 nm was formed with Pt(acac)(2). However, Pt rich phases were formed using all other precursors with a size ranging between 3.6 to 6.4 nm. It was found that the atomic percentage (at%) of Fe in the FePt NPs depends on the reaction parameters. The decomposition behaviour of Fe and Pt-precursors were examined by vibrating sample magnetometer and thermogravimetric measurements. A possible reaction mechanism for Fe depleted FePt formation is proposed which suggests that the reduction potential and decomposition behaviour of the organic and inorganic salts of Pt significantly modify the nucleation behaviour. The electrocatalytic properties of all the four nanomaterials towards methanol oxidation have been investigated by cyclic voltammetry. It is found that Fe19Pt81 with an average size of 6.2 nm shows the highest catalytic response.
 
Publisher ROYAL SOC CHEMISTRY
 
Date 2014-12-28T12:13:19Z
2014-12-28T12:13:19Z
2014
 
Type Article
 
Identifier DALTON TRANSACTIONS, 43(12)4892-4900
1477-9226
1477-9234
http://dx.doi.org/10.1039/c3dt53147c
http://dspace.library.iitb.ac.in/jspui/handle/100/16465
 
Language English