Preliminary studies of the electrochemical performance of Pt/X@MoO₃/C (X?=?Mo₂C, MoO₂, Mo⁰) catalysts for the anode of?a DMFC: Influence of the Pt loading and Mo-phase

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• 作者：O. Guillé ; n-Villafuerte^a ; G. Garcí ; a^a ; ^b ; ^{gonzalo@icp.csic.es} ; ^{ggarcia@ull.es} ; J.L. Rodrí ; guez^a ; E. Pastor^a ; R. Guil-Ló ; pez^b ; ^{rut.guil@icp.csic.es} ; E. Nieto^b ; J.L.G. Fierro^b
• 关键词：Molybdenum carbide ; Carbothermal reduction method ; CO stripping ; Methanol oxidation ; Pt loading ; DMFC
• 刊名：International Journal of Hydrogen Energy
• 出版年：2013
• 出版时间：27 June, 2013
• 年：2013
• 卷：38
• 期：19
• 页码：7811-7821
• 全文大小：1418 K

文摘

The present study is focused on the influence of Pt loading on the reactivity of catalysts prepared supporting the metal on novel core-shell molybdenum substrates. The electrocatalytic activity and stability of nine Pt/X@MoO3/C catalysts (where X denotes the nature of Mo-phases in the core of the core-shell Mo-particle: Mo₂C, MoO₂ and/or Mo⁰) with three Pt loading (5, 20 and 30?wt % Pt) were tested for carbon monoxide and methanol electro-oxidation reactions.

For both reactions, Pt loading appears to be a key factor, obtaining the best performance for those catalysts with higher Pt content. Furthermore, it is observed that the nature of X@MoO₃/C samples plays an important role as promoter for CO and methanol oxidation. MoO₃-shell catalyzes and homogenizes the potentiodynamic responses, while the reduced Mo-phase in the core produces an electronic effect which determines the catalytic activity and stability during the electro-oxidation processes investigated.