Electrochemistry at Chemically Modified Graphenes
Electrochemistry at Chemically Modified Graphenes
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DOI：
10.1002/chem.201101117
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发表时间：
2011-09-01
影响因子：
4.3
通讯作者：
Pumera, Martin
中科院分区：
文献类型：
--
作者：
Ambrosi, Adriano;Bonanni, Alessandra;Pumera, Martin
石墨烯的电化学应用引起了许多研究人员的极大兴趣，因为它们可能导致制造用于能量生产和储存的电化学设备以及高灵敏度传感器的关键技术进步。有许多方法可以制造大量的化学改性的石墨烯（CMG）用于诸如电极材料的应用。每种方法都产生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的石墨烯的电化学性质：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，这使我们能够关联的CMG的结构和化学特征的电化学性能，这些材料的特点。我们发现，热还原的氧化石墨烯在所研究的不同材料中提供了最有利的电化学性能。我们的研究结果对化学修饰的石墨烯在电化学器件中的应用产生了深远的影响。
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.