Tuesday, September 04, 2012

Pt–Pd alloy nanoparticle-decorated carbon nanotubes: a durable and methanol tolerant oxygen reduction electrocatalyst

Sourov Ghosh, Ranjan K Sahu and C Retna Raj



We describe the decoration of multiwalled carbon nanotubes (MCNTs) with Pt–Pd alloy nanoelectrocatalysts of three different compositions and their electrocatalytic performance toward the oxygen reduction reaction (ORR). The decoration of the MCNTs involves polymer-assisted impregnation of metal precursors ##IMG## [http://ej.iop.org/images/0957-4484/23/38/385602/nano431900ieqn22.gif] {${\mathrm{PtCl}}_{6}^{2-}$} and ##IMG## [http://ej.iop.org/images/0957-4484/23/38/385602/nano431900ieqn23.gif] {${\mathrm{PdCl}}_{4}^{2-}$} and the subsequent reduction of the impregnated precursors by a modified polyol route. The composition of the catalyst was controlled by tuning the molar ratio of the precursors during their impregnation. Electron probe microscopic analysis shows that the catalysts have compositions of Pt 46 Pd 54, Pt 64 Pd 36 and Pt 28 Pd 72 . The Pt 46 Pd 54 a...



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