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摘要电极材料催化剂的性能是燃料电池的性能优劣的关键因素之一，开发廉价的非贵金属催化剂是降低燃料电池的成本的有效途径。本论文制备了过渡金属掺杂的N掺杂石墨烯基复合催化材料，并利用XRD、TEM等技术手段对电极材料的微观结构和形貌进行表征，采用循环伏安（CV）、交流阻抗等测试技术手段对材料的电化学电容性能进行了测试。主要的研究内容如下：
- 上一篇：基于二维锑原子晶体的场效应晶体管
- 下一篇：材料亚稳态转变的比容研究
（1）以氧化石墨烯，硝酸钴，硝酸铁，苯胺和过硫酸铵为原料，制备了NG-CoFe2O4纳米复合材料。所制备的复合物呈高度非晶态，墨烯片仍然保持完整。研究表明所制备的复合物具有较小的电阻和比较优异的氧气还原性能，经过750℃热处理后的材料的起始电位约为-0.11 V，峰电位约为-0.26 V，其半峰电流电位约为-0.2 V，经过旋转圆盘电极测试所得到的该材料的氧气还原反应路径主要是按四电子反应历程进行，其电化学性能良好。28494
（2）以乙酸钴、乙酸镍，氨水和氧化石墨烯为原料，采用水热法制备了GN-NiCo2S4纳米复合物。氧化石墨烯在水热过程中还原成了石墨烯。通过TEM图片可以看出，NiCo2S4纳米颗粒均匀的附着在石墨烯片上，纳米粒子的粒径在10~20 nm之间。通过电化学研究，所制备的材料的起始电位大约为-0.09 V,峰电流电位大约为-0.18 V，转移电子数约为4，表明复合材料具有较好的电化学催化性能。
关键词：过渡金属；石墨烯；电化学性能 ；复合物
毕业设计说明书（毕业论文）外文摘要
Title Preparation and Properties of Cobalt containing Multi Metal Sulfide /N Doped Graphene Composites
Abstract
The performance of electrode catalyst is one of the key factors for the performance of the fuel cell. The effective way to reduce the cost of fuel cell is to develop a cheap non noble metal catalyst. In this paper, transition metal based N-doped graphene composites were prepared, and the material microstructure and morphology were characterized by XRD, TEM, and the properties of oxygen reduction reaction were testedusing cyclic voltammetry (CV) and and AC impedance test technology. The main research is as follows:
(1) With graphene oxide, cobalt nitrate, ferric nitrate, aniline and ammonium persulfate were slected as the raw material to prepare the NG-CoFe2O4 nano composite materials. The prepared complexes are highly amorphous, graphene sheets are still intact. The composites prepared show a smaller resistance and good oxygen reduction performance, the onset potential of the composite named as NG-FeCo-750 about -0.11 V, peak potential is about 0.26 V, and half peak current potential about -0.2 V. The oxygen reduction reaction path is mainly according to the four electron reaction mechanism.
(2) With cobalt acetate, nickel acetate, ammonia and graphene oxide as raw materials, GN-NiCo2S4 nanocomposites were prepared by hydrothermal method. Graphene oxide was reduced to graphene during hydrothermal process.. According to the TEM images, NiCo2S4 nanoparticles uniformly attached on the graphene sheets, and the size of nanoparticles is in the range of 10～20 nm. Through electrochemical studies, the preparation of the initial potential of the prepared material is approximately -0.09 V, peak current and potential about 0.18 V, and transfer electron number is about 4, which show that the composite material has good electrochemical performance.
Keywords：metal oxides; graphene; electrochemical performance; composite
目次
第一章 绪论 7
1.1 引言 7
1.2 燃料电池 7
1.2.1 燃料电池的简介 7
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