Single-step synthesis of PtRu/N-doped graphene for methanol electrocatalytic oxidation
Single-step synthesis of PtRu/N-doped graphene for methanol electrocatalytic oxidation
复制标题
一步合成 PtRu/N 掺杂石墨烯用于甲醇电催化氧化
DOI：
10.1016/j.electacta.2013.12.062
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发表时间：
2014
影响因子：
6.6
通讯作者：
Jiangbo Liu
中科院分区：
文献类型：
--
作者：
Xiao Xu;Yingke Zhou;Jiming Lu;Xiaohui Tian;Hongxi Zhu;Jiangbo Liu
在这项工作中，一个单步的路线，应用于实现氧化石墨烯的还原，石墨烯的功能性掺杂与氮，并沉积良好分散的PtRu合金纳米粒子的掺杂石墨烯上的同时在溶剂中的乙二醇和N-甲基-2-吡咯烷酮的混合物。采用透射电子显微镜、X射线粉末衍射、拉曼光谱和X射线光电子能谱等表征手段对催化剂的形貌和微观结构进行了表征，并采用循环伏安法、计时电流法和电化学阻抗技术对PtRu/氮掺杂石墨烯催化剂的甲醇氧化活性和耐久性进行了评价。与未掺杂的PtRu/graphene相比，氮掺杂的PtRu/graphene催化剂具有更好的粒径分布，提高了甲醇电催化氧化的活性和耐久性，并可通过优化反应时间、温度以及反应介质的组成进一步提高。该催化剂的一步合成工艺简便，在直接甲醇燃料电池中具有潜在的应用前景。
In this work, a single-step route was applied to achieve the reduction of graphene oxide, functional doping of graphene with nitrogen, and deposition of well-dispersed PtRu alloy nanoparticles on the doped graphene simultaneously in the solvent mixture of ethylene glycol and N-methyl-2-pyrrolidone. Transmission electron microscopy, X-ray powder diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy were used to characterize the morphology and microstructure, while cyclic voltammetry, chronoamperometry and electrochemical impedance techniques were carried out to evaluate the electrocatalytic methanol oxidation activity and durability of the obtained PtRu/nitrogen-doped graphene catalysts. Compared to undoped PtRu/graphene, the nitrogen-doped PtRu/graphene catalyst presented better particle size distribution and improved activity and durability of methanol electrocatalytic oxidation, which could be further improved by optimization of the reaction time, temperature, as well as the composition of the reaction medium. The convenient single-step synthesis process for the PtRu/nitrogen-doped graphene catalysts is promising for the potential application of direct methanol fuel cells.