Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore.
Chemistry. 2011 Sep 12;17(38):10763-70. doi: 10.1002/chem.201101117. Epub 2011 Aug 11.
Electrochemical applications of graphene are of great interest to many researchers as they can potentially lead to crucial technological advancements in fabrication of electrochemical devices for energy production and storage, and highly sensitive sensors. There are many routes towards fabrication of bulk quantities of chemically modified graphenes (CMG) for applications such as electrode materials. Each of them yields different graphene materials with different functionalities and structural defects. Here, we compare the electrochemical properties of five different chemically modified graphenes: graphite oxide, graphene oxide, thermally reduced graphene oxide, chemically reduced graphene oxide, and electrochemically reduced graphene oxide. We characterized these materials using transmission electron microscopy, Raman spectroscopy, high-resolution X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy, and cyclic voltammetry, which allowed us to correlate the electrochemical properties with the structural and chemical features of the CMGs. We found that thermally reduced graphene oxide offers the most favorable electrochemical performance among the different materials studied. Our findings have a profound impact for the applications of chemically modified graphenes in electrochemical devices.
石墨烯的电化学应用引起了许多研究人员的极大兴趣，因为它们有可能为电化学器件的制造带来关键的技术进步，这些电化学器件可用于能量产生和存储以及高灵敏度传感器。有许多途径可以制备大量的化学改性石墨烯（CMG），例如作为电极材料。它们中的每一种都得到了具有不同功能和结构缺陷的不同石墨烯材料。在这里，我们比较了五种不同化学改性石墨烯的电化学性能：氧化石墨、氧化石墨烯、热还原氧化石墨烯、化学还原氧化石墨烯和电化学还原氧化石墨烯。我们使用透射电子显微镜、拉曼光谱、高分辨率 X 射线光电子能谱、电化学阻抗谱和循环伏安法对这些材料进行了表征，这使我们能够将电化学性能与 CMG 的结构和化学特征相关联。我们发现，在研究的不同材料中，热还原氧化石墨烯提供了最有利的电化学性能。我们的研究结果对化学改性石墨烯在电化学器件中的应用具有深远的影响。
