Pt–Au/nitrogen-doped graphene nanocomposites for enhanced electrochemical activities
Pt–Au/nitrogen-doped graphene nanocomposites for enhanced electrochemical activities
复制标题
DOI：
10.1039/c2ta00776b
复制
发表时间：
2013-01
影响因子：
--
通讯作者：
Guohai Yang;Yongjie Li;R. Rana;Jun‐Jie Zhu
中科院分区：
文献类型：
--
作者：
Guohai Yang;Yongjie Li;R. Rana;Jun‐Jie Zhu
采用原位组装法在氮掺杂石墨烯（N-G）片上制备了Pt-Au合金纳米粒子（NPs），制备的Pt-Au/N-G纳米复合材料具有良好的电化学性能。通过透射电子显微镜、X射线光电子能谱、X射线衍射分析和电感耦合等离子体原子发射光谱等技术表征，Pt-Au合金纳米颗粒通过内在共价键均匀分布在N-G表面，平均粒径为4-5 nm。Pt-Au/N-G纳米复合材料对甲醇氧化反应表现出优异的电催化活性和稳定性，其中Pt/Au原子比为3/1时的催化活性最高。独特的电化学特征是区别于那些无N纳米复合材料和市售的Pt/C催化剂，指示Pt-Au的合金化效应和它们与N-G片的协同相互作用，这可能开辟了新的可能性，为其他密集的应用，以及制备N-G-基纳米复合材料。
A facile in situ assembly strategy was developed for the fabrication of Pt–Au alloy nanoparticles (NPs) on nitrogen-doped graphene (N–G) sheets, and the as-fabricated Pt–Au/N–G nanocomposites were suitable for electrochemical applications. As characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction analysis and inductively coupled plasma-atomic emission spectroscopy techniques, Pt–Au alloy NPs with an average size of 4–5 nm were uniformly distributed on the N–G surface through intrinsic covalent bonds. The Pt–Au/N–G nanocomposites exhibited excellent electrocatalytic activity and stability towards the methanol oxidation reaction with the highest capability observed for a Pt/Au atomic ratio of 3/1. The unique electrochemical features are distinctive from those of N-free nanocomposites and commercially available Pt/C catalysts, indicative of the alloying effect of Pt–Au and their synergistic interaction with the N–G sheet, which may open up new possibilities for the preparation of N–G-based nanocomposites for other intensive applications as well.