【作者】 林少雄； 申承民； 陆大班； 王春明； 高鸿钧；

【Author】 S.X.Lin;C.M.Shen;D.B.Lu;C.M.Wang;H.-J.Gao;Beijing National Laboratory of Condensed Matter Physics,Institute of Physics, Chinese Academy of Sciences;College of Chemistry and Engineering, Lanzhou University;

【机构】 北京凝聚态国家实验室中国科学院物理研究所； 兰州大学化学化工学院；

【摘要】 采用一种零维结构四氧化三铁-石墨烯(核/壳结构)作为载体材料,改善在甲醇电化学氧化中Pt纳米粒子催化剂的利用率。在合成的Fe3O4磁性纳米球表面包裹上一薄层的SiO2,再利用化学方法于表面修饰上氨基,使磁性颗粒表面带有正电荷。通过静电组装的方法在其表面上包覆一薄层的氧化石墨烯,并采用乙二醇-水体系同时还原,得到Pt-rGO-AMs磁性纳米球。对合成的Pt-rGO-AMs进行了形貌、结构及性质的表征。通过电化学实验证实了合成出来的催化剂相对于层状石墨烯载体具有较高的电化学活性表面积,电催化活性和电化学稳定性。更多还原

【Abstract】 Pt nanoparticles(NPs) have attracted much attention for their superior catalysis for many chemical reactions, especially for hydrogen oxidation and oxygen reduction in fuel cell reactions. Here, we reported that reduced graphene oxide(rGO)-encapsulated amine functionalized Fe3O4 magnetic nanospheres(AMs), were used to support Pt catalysts(Pt-rGO-AMs). The Pt-rGO-AMs exhibit excellent ferromagnetic property, which makes it possible to realize controllable on-off reactions and convenient recycling of catalyst materials. The electrochemical activity of the catalyst for methanol oxidation is significantly improved compared to Pt NPs absorbed on a rGO sheet and has better stability. The superior performance of this Pt-rGO-AMs catalyst is attributed both to the structure, which improve the accessibility of the Pt NPs by exposing them on the surface of the support, and to the greatly improved electronic conductivity of the support.更多还原