Bipolar anodic electrochemical exfoliation of graphite powders
Bipolar anodic electrochemical exfoliation of graphite powders
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DOI：
10.1016/j.elecom.2019.06.001
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发表时间：
2019-07
影响因子：
5.4
通讯作者：
H. Hashimoto;Yusuke Muramatsu;Y. Nishina;H. Asoh
中科院分区：
文献类型：
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作者：
H. Hashimoto;Yusuke Muramatsu;Y. Nishina;H. Asoh
石墨的电化学剥离作为用于大规模、快速生产石墨烯和氧化石墨烯（GO）的方法已经引起相当大的关注。由于剥离通常需要直接电接触，并且受到起始石墨的形状和/或尺寸的限制，因此小石墨颗粒和粉末（市售的典型形式）的处理是极其困难的。在这项研究中，GO纳米片成功地从小的石墨颗粒和粉末通过双极电化学过程制备。将石墨样品置于两个铂进料电极之间，并使用稀硫酸作为电解质在进料电极之间施加恒定电流。采用光学显微镜、原子力显微镜、X射线衍射、拉曼光谱和X射线光电子能谱对电解后得到的样品进行了检测。从这些分析获得的结果证实了在石墨样品中发生阳极电化学剥离，并且剥离的样品基本上是具有低氧化度（C/O = 3.6-5.3）的高度结晶的GO纳米片。这种简单的电化学方法对于从小颗粒石墨制备大量石墨烯和GO非常有用。
The electrochemical exfoliation of graphite has attracted considerable attention as a method for large-scale, rapid production of graphene and graphene oxide (GO). As exfoliation typically requires direct electrical contact, and is limited by the shape and/or size of the starting graphite, treatment of small graphite particles and powders, the typical form available commercially, is extremely difficult. In this study, GO nanosheets were successfully prepared from small graphite particles and powders by a bipolar electrochemical process. Graphite samples were placed between two platinum feeder electrodes, and a constant current was applied between the feeder electrodes using dilute sulfuric acid as the electrolyte. Optical microscopy, atomic force microscopy, X-ray diffractometry, Raman spectroscopy, and X-ray photoelectron spectroscopy were employed to examine the samples obtained after electrolysis. The results obtained from these analyses confirmed that anodic electrochemical exfoliation occurs in the graphite samples, and the exfoliated samples are basically highly crystalline GO nanosheets with a low degree of oxidation (C/O = 3.6–5.3). This simple electrochemical method is extremely useful for preparing large amounts of graphene and GO from small particles of graphite.