Jeyabharathi, C. and Venkateshkumar, P. and Mathiyarasu, J. and Phani, K.L.N. (2008) Platinum–tin bimetallic nanoparticles for methanol tolerant oxygen-reduction activity. Electrochimica Acta, 54 (2). pp. 448-454.

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Carbon-supported Pt–Sn/C bimetallic nanoparticle electrocatalystswere prepared by the simple reduction of the metal precursors using ethylene glycol. The catalysts heat-treated under argon atmosphere to improve alloying of platinum with tin. As-prepared Pt–Sn bimetallic nanoparticles exhibit a single-phase fcc structure of Pt and heat-treatment leading to fcc Pt75Sn25 phase and hexagonal alloy structure of the Pt50Sn50 phase. Transmission electron microscopy image of the as-prepared Pt–Sn/C catalyst reveals a mean particle diameter of ca. 5.8nm with a relatively narrow size distribution and the particle size increased to ca. 20nm when heat-treated at 500 ◦C due to agglomeration. The electrocatalytic activity of oxygen reduction assessed using rotating ring disk electrode technique (hydrodynamic voltammetry) indicated the order of electrocatalytic activity to be: Pt–Sn/C (as-prepared) > Pt–Sn/C (250 ◦C) > Pt–Sn/C (500 ◦C) > Pt–Sn/C (600 ◦C) > Pt–Sn/C (800 ◦C). Kinetic analysis reveals that the oxygen reduction reaction on Pt–Sn/C catalysts follows a four-electron process leading to water. Moreover, the Pt–Sn/C catalyst exhibited much higher methanol tolerance during the oxygen reduction reaction than the Pt/C catalyst, assessing that the present Pt–Sn/Cbimetallic catalystmay function as amethanol-tolerant cathode catalyst in a direct methanol fuel cell.

Item Type: Article
Uncontrolled Keywords: Methanol tolerant; Electrocatalysis; Cathode catalyst; Platinum–tin; Oxygen-reduction
Subjects: Electrodics and Electrocatalysis
Depositing User: ttbdu cecri
Date Deposited: 16 Jan 2012 16:08
Last Modified: 16 Jan 2012 16:08

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