• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Aqueous Dispersions of Graphene from Electrochemically Exfoliated Graphite
【24h】

Aqueous Dispersions of Graphene from Electrochemically Exfoliated Graphite

机译：电化学剥离石墨中石墨烯的水分散体

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A facile and environmentally friendly synthetic strategy for the production of stable and easily processable dispersions of graphene in water is presented. This strategy represents an alternative to classical chemical exfoliation methods (for example the Hummers method) that are more complex, harmful, and dangerous. The process is based on the electrochemical exfoliation of graphite and includes three simple steps: 1)the anodic exfoliation of graphite in (NH4)(2)SO4, 2)sonication to separate the oxidized graphene sheets, and 3)reduction of oxidized graphene to graphene. The procedure makes it possible to convert around 30wt% of the initial graphite into graphene with short processing times and high yields. The graphene sheets are well dispersed in water, have a carbon/oxygen atomic ratio of 11.7, a lateral size of about 0.5-1m, and contain only a few graphene layers, most of which are bilayer sheets. The processability of this type of aqueous dispersion has been demonstrated in the fabrication of macroscopic graphene structures, such as graphene aerogels and graphene films, which have been successfully employed as absorbents or as electrodes in supercapacitors, respectively.
机译：提出了一种简便，环保的合成策略，用于生产稳定且易于加工的石墨烯在水中的分散体。该策略代表了更复杂，有害和危险的经典化学剥离方法（例如Hummers方法）的替代方法。该方法基于石墨的电化学剥离，包括三个简单步骤：1）在（NH4）（2）SO4中对石墨进行阳极剥离，2）超声处理以分离氧化的石墨烯片，以及3）氧化的石墨烯还原为石墨烯。该程序使得可以以短的处理时间和高产率将约30wt％的初始石墨转化为石墨烯。石墨烯片良好地分散在水中，碳/氧原子比为11.7，横向尺寸约为0.5-1m，并且仅包含几个石墨烯层，其中大多数是双层片。这种类型的水分散体的可加工性已在宏观石墨烯结构的制造中得到证明，例如石墨烯气凝胶和石墨烯薄膜，它们已分别成功地用作吸收剂或用作超级电容器中的电极。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号