摘要石墨烯由于其独特的化学结构而具有优异的物理化学性质，得到越来越多研究工作者的关注与探讨。一方面燃料电池的电化学催化剂目前用于商用的仍是铂或铂合金等贵金属催化剂，为了降低成本同时保证性能，人们开始研究过渡金属及其氧化物作为电催化剂的可能性。本论文首先利用一步水热法制备氮掺杂石墨烯/铁氧化物，既利用石墨烯的优异性质，又利用铁氧化物的催化作用，同时通过氮掺杂来进一步改善石墨烯的电学性能。另一方面，碳材料负载金属氧化物也是超级电容器的一个研究热点，本论文也同时检测了样品的比电容、阻抗等电学性质。另外辅以X射线衍射谱(XRD)，拉曼光谱(Raman)，透射电子显微镜(TEM)等手段对制备的电极材料的元素组成和形貌进行了表征。结果表明制得的铁氧化物是Fe2O3，TEM显示Fe2O3均匀负载在氮掺杂的石墨烯上，电催化CV曲线对比显示当反应物中有乙酸钠作为辅助时得到的样品电化学催化氧还原性能最好，而采用乙二胺辅助氮掺杂得到的样品的比电容比其他样品明显偏高，电阻也较小。63804

毕业论文关键词  氮掺杂石墨烯  铁氧化物  电催化  超级电容器

毕业设计说明书（论文）外文摘要

Title The Preparation and the Electrochemical Properties of Graphene/Iron Oxides Composite                              

  Abstract Due to its unique chemical structure and has excellent physical and chemical properties, Graphene has been achieve more and more attention. And for fuel cells, the noble metal such as platinum or platinum alloy are still currently used for commercial the catalysts, in order to reduce cost while maintaining performance, transition metals and their oxides have been studied as the new catalysts. In this paper, nitrogen-doped graphene / iron oxide was synthesized by one pot hydrothermal method. The as-prepared composite both combine the excellent properties of graphene with the catalyst properties of iron oxide. Besides, nitrogen doping was used to further improve the electrical properties of graphene. In another way, the carbon material/metal oxide composites are considered as a candidate for supercapacitor. This paper also test the supercapacitor performance of the as-prepared composie, such as the specific capacitance, electrochemical impedance. Furthermore, the component and the morphology of those composites were characterized by X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM). As the results TEM images show that Fe2O3 nanoparticles were uniform coated on the nitrogen-doped graphene sheets. From the CV curves of electrochemical catalytic, the oxygen reduction properties of composite, which was prepared using sodium acetate, exhibits the best performance. While for supercapacitor, the adding of ethylenediamine is helpful to increased the capacitance of the composoite, the composite obtained in this conduction get the better specific capacitance than other composite, and the resistance of this composite is small.

Keywords N doped graohene; iron oxide; electrochemical catalyst; supercapacitor

 1 绪论 1

1.1  电化学催化与电化学催化剂 1

1.1.1  电化学催化 1

1.1.2  电化学催化剂 1

1.2  电化学催化氧还原 2

1.2.1  电化学催化氧还原机理 2

1.2.2  电化学催化氧还原研究进展 3

1.3  超级电容器 3