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首页> 外文期刊>ACS applied materials & interfaces >Microwave-Assisted Synthesis of Highly Dispersed PtCu Nanoparticles on Three-Dimensional Nitrogen-Doped Graphene Networks with Remarkably Enhanced Methanol Electrooxidation
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Microwave-Assisted Synthesis of Highly Dispersed PtCu Nanoparticles on Three-Dimensional Nitrogen-Doped Graphene Networks with Remarkably Enhanced Methanol Electrooxidation

机译：在三维氮掺杂石墨烯网络上微波辅助合成高度分散的PtCu纳米粒子，甲醇电化学氧化显着增强

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摘要

A well-dispersed PtCu alloy nanoparticles (NPs) on three-dimensional nitrogen-doped graphene (PtCu/3D N-G) electrocatalyst has been successfully synthesized by a conventional hydrothermal method combined with a high-efficiency microwave-assisted polyol process. The morphology, composition, and structures are well-characterized by scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, X-ray powder diffraction, and X-ray photoelectron spectroscopy. Cyclic voltammograms illustrate that the as-prepared PtCu/3D N-G electrocatalyst possesses the larger electrochemical active surface area, lower onset potential, higher current density, and better tolerance to CO poisoning than PtCu NPs on reduced graphene oxide and XC-72 carbon black in acid solution. In addition, long-time chronoamperometry reveals that the PtCu/3D N-G catalyst exhibits excellent stability even longer than 60 min toward acid methanol electrooxidation. The remarkably enhanced performance is related to the combined effects of uniformly interconnected three-dimensional porous graphene networks, nitrogen doping, modified Pt alloy NPs, and strong binding force between Pt alloy NPs and 3D N-G structures.
机译：通过常规水热法结合高效微波辅助多元醇工艺成功地合成了在三维氮掺杂石墨烯（PtCu / 3D N-G）电催化剂上的分散良好的PtCu合金纳米粒子（NPs）。形态，组成和结构通过扫描电子显微镜，透射电子显微镜，拉曼光谱，X射线粉末衍射和X射线光电子光谱被很好地表征。循环伏安图表明，与还原后的氧化石墨烯和XC-72炭黑在酸性条件下相比，所制备的PtCu / 3D NG电催化剂具有更大的电化学活性表面积，更低的起始电势，更高的电流密度以及对CO中毒的耐受性。解。此外，长时间计时电流法显示，PtCu / 3D N-G催化剂即使对酸性甲醇进行电氧化也能保持60分钟以上的稳定性。显着增强的性能与均匀互连的三维多孔石墨烯网络，氮掺杂，改性的Pt合金NP以及Pt合金NP与3D N-G结构之间的强结合力的综合作用有关。

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