Synthesis of boron and nitrogen doped graphene supporting PtRu nanoparticles as catalysts for methanol electrooxidation
Synthesis of boron and nitrogen doped graphene supporting PtRu nanoparticles as catalysts for methanol electrooxidation
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硼氮掺杂石墨烯负载 PtRu 纳米颗粒的合成作为甲醇电氧化催化剂
DOI：
10.1016/j.apsusc.2014.08.083
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发表时间：
2014-10
影响因子：
6.7
通讯作者：
Yuan Tao
中科院分区：
文献类型：
--
作者：
Lu Jiming;Zhou Yingke;Tian Xiaohui;Xu Xiao;Zhu Hongxi;Zhang Shaowei;Yuan Tao
在这项研究中，我们展示了一个单步热处理的方法来合成硼和氮掺杂的石墨烯负载PtRu电催化剂用于甲醇的电氧化反应。氧化石墨烯的还原、石墨烯的硼或氮掺杂以及PtRu纳米粒子的负载在反应过程中同时发生。采用扫描电子显微镜（SEM）、X射线衍射（XRD）、透射电子显微镜（TEM）和X射线光电子能谱（XPS）对催化剂的形貌和微观结构进行了表征。采用循环伏安法和计时电流法对催化剂的甲醇电催化氧化活性和耐久性进行了评价。结果表明，采用一步热处理技术可以成功制备硼氮掺杂石墨烯负载PtRu电催化剂，在还原石墨烯片上引入含硼或氮官能团可以调节负载PtRu纳米颗粒的粒径和分散性，提高其对甲醇氧化反应的电催化性能。最佳退火温度为800 °C，最佳热处理时间为60 min（氮掺杂催化剂）和90 min（硼掺杂催化剂），在此条件下制备的催化剂对甲醇氧化具有上级催化活性。
In this study, we demonstrate a single-step heat treatment approach to synthesize boron and nitrogen doped graphene supporting PtRu electrocatalysts for methanol electro-oxidation reaction. The reduction of graphene oxide, boron or nitrogen doping of graphene and loading of PtRu nanoparticles happened simultaneously during the reaction process. The morphologies and microstructures of the as-prepared catalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The electrocatalytic methanol oxidation activity and durability of the obtained catalysts were evaluated by the cyclic voltammetry and chronoamperometric techniques. The results reveal that the boron and nitrogen doped graphene supporting PtRu electrocatalysts can be successfully prepared by the single step heat treatment technique, and the introduction of boron or nitrogen containing function groups into the reduced graphene sheets could modulate the particle size and dispersion of the supporting PtRu nanoparticles and improve the electrocatalytic performance of methanol oxidation reaction. The optimal annealing temperature is 800 °C, the preferable heat treatment time is 60 min for the nitrogen-doped catalysts and 90 min for the boron-doped catalysts, and the catalysts prepared under such conditions present superior catalytic activities for methanol oxidation than those prepared under other heat treatment conditions.
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