...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Synthesis and control of high-performance MnO2/carbon nanotubes nanocomposites for supercapacitors
【24h】

Synthesis and control of high-performance MnO2/carbon nanotubes nanocomposites for supercapacitors

机译：超级电容器用高性能MnO2 /碳纳米管纳米复合材料的合成与控制

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

The rational combination of transition-metal oxides and carbon materials has been regarded as an efficient way of assembling the next-generation of electrode materials for supercapacitors. Here, a unique nanomaterial consisting of carbon nanotubes (CNTs) grafted with MnO2 was synthesized for use in supercapacitors with high electrochemical performance. The synthesis was performed in three steps: surface functionalization of the CNTs with carboxyl groups, grafting of Mn2+ with the carboxyl groups, and transformation of the Mn2+ into MnO2 nanoparticles by KMnO4 oxidation. The bonds between the CNTs and the MnO2 particles are believed to form between the carbon of the carboxyl groups of the CNTs and the oxygen atoms of the MnO2 lattice. In addition, varying the acid-treatment time enabled control of the growth density of MnO2 and affected the structural integrity of the CNTs, endowing the novel hybrid material with an adjustable electrochemical performance. As a consequence, the MnO2/CNTs composite with a 36 h acid treatment exhibited a maximum specific capacitance of up to 348 F g(-1) at a cyclic voltammetry scanning rate of 5 mV s(-1). A symmetric supercapacitor assembled with the electrodes made from this MnO2/CNTs composite showed a capacitance decay rate of only 8.7% after 5000 cycles. (C) 2016 Elsevier B.V. All rights reserved.
机译：过渡金属氧化物和碳材料的合理组合已被视为组装下一代超级电容器电极材料的有效方法。在这里，合成了一种独特的纳米材料，该材料由接枝有MnO2的碳纳米管（CNT）组成，用于具有高电化学性能的超级电容器。合成过程分三个步骤进行：带有羧基的CNT的表面官能化，带有羧基的Mn2 +的接枝以及通过KMnO4氧化将Mn2 +转化为MnO2纳米颗粒。认为CNT与MnO 2颗粒之间的键形成在CNT的羧基的碳与MnO 2晶格的氧原子之间。此外，改变酸处理时间可以控制MnO2的生长密度并影响CNT的结构完整性，从而使新型杂化材料具有可调节的电化学性能。结果，经过36 h酸处理的MnO2 / CNTs复合材料在5 mV s（-1）的循环伏安扫描速率下显示了高达348 F g（-1）的最大比电容。由这种MnO2 / CNTs复合材料制成的电极组装而成的对称超级电容器在5000次循环后的电容衰减率仅为8.7％。 （C）2016 Elsevier B.V.保留所有权利。

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