• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Effect of drying conditions on the structure of three-dimensional N-doped graphene and its electrochemical performance
【24h】

Effect of drying conditions on the structure of three-dimensional N-doped graphene and its electrochemical performance

机译：干燥条件对三维N掺杂石墨烯结构及其电化学性能的影响

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

Freeze drying is a general method for preparing three dimensional (3D) graphene based materials, however, in this paper, we used N-doped graphene as a model material and found that if the N-doped graphene hydrogel was pre-frozen, instead of an interconnected porous structure, a loosely packed layered structure was obtained. Furthermore, the effects of drying conditions on the pore and chemical structure have been discussed. Results demonstrated that when the graphene hydrogel was directly freeze dried, an interconnected porous structure can be obtained, whereas, heat dried and pre-frozen samples had layered structures. The structure determines the performance; the sample prepared by direct freeze drying with an interconnected porous structure had the highest specific capacitance of 218 F g(-1) when the current density was 0.01 A g(-1), and the specific capacitance still remained at about 85% of its initial value even at a high current density (1 A g(-1)). The excellent electrochemical performance is mainly attributed to the fast electrolyte diffusion paths provided by the interconnected porous channels.
机译：冷冻干燥是制备基于三维（3D）石墨烯的材料的通用方法，但是，在本文中，我们使用掺氮石墨烯作为模型材料，发现如果掺氮石墨烯水凝胶是预先冷冻的，而不是互连的多孔结构，得到松散堆积的层状结构。此外，还讨论了干燥条件对孔和化学结构的影响。结果表明，当将石墨烯水凝胶直接冷冻干燥时，可以获得互连的多孔结构，而加热干燥和预冷冻的样品则具有分层结构。结构决定了性能;当电流密度为0.01 A g（-1）时，通过具有互连多孔结构的直接冷冻干燥制备的样品具有最高的218 F g（-1）的比电容，并且比电容仍保持在其约85％甚至在高电流密度（1 A g（-1））时的初始值。优异的电化学性能主要归因于由互连的多孔通道提供的快速电解质扩散路径。

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