• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced Functional Materials >Catalytic Twist-Spun Yarns of Nitrogen-Doped Carbon Nanotubes
【24h】

Catalytic Twist-Spun Yarns of Nitrogen-Doped Carbon Nanotubes

机译：氮掺杂碳纳米管的催化捻线

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 treatment of free-standing sheets of multiwailed carbon nanotubes (MWNTs) with a NH_3/He plasma results in self-supporting sheets of aligned N-doped MWNTs (CN_x). These CN_x sheets can be easily twist spun in the solid state to provide strong CN_x yarns that are knottable, weavable, and sewable. The CN_x yarns exhibit tunable catalytic activity for electrochemically driven oxygen reduction reactions (ORR), as well as specific capacitances (up to 39 F·g~(-1)) that are 2.6 times higher than for the parent MWNTs. Due to a high degree of nanotube alignment, the CN_x yarns exhibit specific strengths (451 ± 61 MPa·cm~3·g~(-1)) that are three times larger than observed for hybrid CNj/MWNT biscrolled yarns containing 70 wt.% CN_x in the form of a powder. This difference in mechanical strength arises from substantial differences in yarn morphology, revealed by electron microscopy imaging of yarn cross-sections, as well as the absence of a significant strength contribution from CN_x nanotubes in the biscrolled yarns. Finally, the chemical nature and abundance of the incorporated nitrogen within the CN_x nanotubes is studied as function of plasma exposure and annealing processes using X-ray photoelectron spectroscopy and correlated with catalytic activity.
机译：用NH_3 / He等离子体处理多层有机碳纳米管（MWNT）的自支撑片会产生自支撑的N掺杂MWNT（CN_x）取向片。这些CN_x片材可以很容易地在固态状态下加捻纺丝，以提供结实，可编织和可缝合的坚固CN_x纱线。 CN_x纱对电化学驱动的氧还原反应（ORR）具有可调节的催化活性，并且比电容（高达39 F·g〜（-1））比母体MWNT高2.6倍。由于高度的纳米管排列，CN_x纱表现出的比强度（451±61 MPa·cm〜3·g〜（-1））比含有70 wt。％的CNj / MWNT混合双股纱所观察到的大三倍。粉末形式的％CN_x。机械强度的这种差异是由纱线横截面的电子显微镜成像所揭示的，在纱线形态上的显着差异，以及双卷纱线中CN_x纳米管没有明显的强度贡献所致。最后，使用X射线光电子能谱研究了CN_x纳米管中掺入氮的化学性质和丰度与等离子体暴露和退火过程的关系，并与催化活性相关。

著录项

  • 来源
    《Advanced Functional Materials》 |2012年第5期|p.1069-1075|共7页
  • 作者

    Xavier Lepro; Raquel Ovalle-Robles; Marcio D. Lima; Ana Laura Ellas; Mauricio Terrones; Ray H. Baughman;

  • 作者单位

    The Alan G. MacDiarmid NanoTech Institute The University of Texas at Dallas Richardson, TX 75083, USA;

    The Alan G. MacDiarmid NanoTech Institute The University of Texas at Dallas Richardson, TX 75083, USA;

    The Alan G. MacDiarmid NanoTech Institute The University of Texas at Dallas Richardson, TX 75083, USA;

    Department of Physics Department of Materials Science and Engineering and Materials Research Institute The Pennsylvania State University 104 Davey Lab., University Park, PA 16802, USA;

    Exotic Nanocarbon Research Center Shinshu University Wakasato 4-17-1, Nagano 380-8553, Japan,Department of Physics Department of Materials Science and Engineering and Materials Research Institute The Pennsylvania State University 104 Davey Lab., University Park, PA 16802, USA;

    The Alan G. MacDiarmid NanoTech Institute The University of Texas at Dallas Richardson, TX 75083, USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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