Senthil Kumar, S. and Phani, K.L.N. (2009) Exploration of unalloyed bimetallic Au–Pt/C nanoparticles for oxygen reduction reaction. Journal of Power Sources, 187 (1). pp. 19-24.

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Abstract

The synthesis of carbon-supported unalloyed Au–Pt bimetallic nanoparticles using polyol method at a temperature as low as 85 ◦C is reported. Various compositions of Au–Pt/C bimetallic nanoparticles are characterized using transmission electron microscopy (TEM), X-ray florescence (XRF), X-ray diffraction and cyclic voltammetry. Electron microscopy shows that the particles have a near-narrowsize distribution that peaks at an average size of ∼5 to 6 nm. The electrocatalytic activity of Au–Pt/C nanoparticles towards the oxygen reduction reaction (ORR) is studied by linear sweep polarization measurements obtained using a rotating disc electrode (RDE). The results reveal that a four-electron transfer pathway is mainly operative for ORR and the half-wave potential for ORR on bimetallic Au–Pt/C (20%:20%) is ∼100mV less negative when compared with that of Pt/C (home-made and E-Tek). Studies of the methanol oxidation reaction (MOR) on these catalysts show that the MOR activity is significantly lowered with increasing content of Au in Au–Pt/C.

Item Type:	Article
Uncontrolled Keywords:	Unalloyed Au–Pt/C bimetallic nanoparticle; Oxygen reduction; Methanol oxidation; Rotating disc electrode
Subjects:	Electrodics and Electrocatalysis
Divisions:	UNSPECIFIED
Depositing User:	TTBD CECRI
Date Deposited:	25 Feb 2012 15:41
Last Modified:	25 Feb 2012 15:41
URI:	http://cecri.csircentral.net/id/eprint/658

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