石墨烯负载PtPd纳米催化剂的合成及其电催化氧化甲醇性能

doi:10.3866/PKU.WHXB201704242

Abstract

Abstract:

This work describes the preparation of three kinds of PtPd/graphene (PtPd/G) nanocatalysts. Graphene oxide was first prepared as the carrier precursor by the Hummers method, and subsequently, the simultaneous reduction of graphene oxide and the metal precursor led to the in situ loading of PtPd on graphene. The fabrication procedure involving liquid phase co-reduction and successive reduction methods utilized the block copolymer P123 as a reducing agent, stabilizer, and morphology control agent. The morphology, structure, and composition of the obtained catalysts were studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). It was found that the catalysts synthesized by the co-reduction method possess a nanodendritic structure, while those prepared by successive reduction exhibit a hollow structure. Cyclic voltammetry and chronoamperometry investigations revealed that the PtPd/G catalyst with a hollow structure displayed the best anti-CO poisoning properties. In contrast, the catalyst with a dendritic structure that had been prepared at 100℃ showed the highest electrocatalytic performance towards methanol oxidation, which was 1.5 times that of the commercial Pt/C electrocatalyst.

Key words: Graphene, In situ loading, Nanodendritic, Hollow structure, Methanol oxidation

Yi YANG,Lai-Ming LUO,Di CHEN,Hong-Ming LIU,Rong-Hua ZHANG,Zhong-Xu DAI,Xin-Wen ZHOU. Synthesis and Electrocatalytic Properties of PtPd Nanocatalysts Supported on Graphene for Methanol Oxidation[J]. Acta Phys. -Chim. Sin. 2017, 33(8), 1628-1634. doi: 10.3866/PKU.WHXB201704242

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Synthesis and Electrocatalytic Properties of PtPd Nanocatalysts Supported on Graphene for Methanol Oxidation

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