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Carbon-Based Composite as an Efficient and Stable Metal-Free Electrocatalyst

机译：碳基复合材料作为高效，稳定的无金属电催化剂

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摘要

Silicon carbide (SiC) encapsulated with graphitized nanodiamond (GD) sheaths (SiC-GD) as a core-shell nanocrystal (NC) is synthesized with atomic H post-treatment of vertically aligned carbon nanotubes, which are unzipped and converted into graphene nanoribbons (GNRs) and preserve their vertically aligned integrity. The SiC-GD core-shell NCs anchor on the GNRs framework and form SiC-GD@GNRs composite. The nucleation and growth mechanisms for single crystal nanodiamond without diamond seed are discussed. The SiC-GD@GNRs composite as a metal-free electrocatalyst exhibits a high activity in the hydrogen evolution reaction, with a small onset overpotential of 8 mV, Tafel slope of 54 mV dec(-1), and exchange current density @200 mV of 77.4 mV, as well as long term stability in acid medium. The superior electrocatalytic performances of SiC-GD@GNRs are ascribed to a high dispersion of SiC-GD NCs on the GNRs support and a high stability of the GD and GNRs in acid solution.
机译：通过对垂直排列的碳纳米管进行原子H后处理，将石墨化的纳米金刚石（GD）鞘（SiC-GD）封装为核壳纳米晶体（NC）封装的碳化硅（SiC），将其解压缩并转化为石墨烯纳米带（ GNR）并保留其垂直对齐的完整性。 SiC-GD核-壳NC锚固在GNRs框架上，并形成SiC-GD @ GNRs复合材料。讨论了没有金刚石种子的单晶纳米金刚石的成核和生长机理。 SiC-GD @ GNRs复合材料作为一种无金属的电催化剂，在析氢反应中表现出高活性，起始电势较小，为8 mV，Tafel斜率为54 mV dec（-1），交换电流密度为200 mV在酸性介质中的长期稳定性为77.4 mV。 SiC-GD @ GNRs优异的电催化性能归因于SiC-GD NCs在GNRs载体上的高度分散性以及GD和GNRs在酸性溶液中的高稳定性。

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  • 来源
    《Advanced Functional Materials》 |2016年第21期|3621-3629|共9页
  • 作者

    Fan Xiujun; Peng Zhiwei; Wang Juanjuan; Ye Ruquan; Zhou Haiqing; Guo Xia;

  • 作者单位

    Shanxi Univ, Inst Crystalline Mat, Taiyuan 030006, Shanxi, Peoples R China|Beijing Univ Technol, Coll Elect Informat & Control Engn, Beijing 100124, Peoples R China|Rice Univ, Dept Chem, POB 1892, Houston, TX 77005 USA|Rice Univ, Richard E Smalley Inst Nanoscale Sci & Technol, Houston, TX 77005 USA;

    Rice Univ, Dept Chem, POB 1892, Houston, TX 77005 USA;

    Shanxi Univ, Sci Instrument Ctr, Taiyuan 030006, Shanxi, Peoples R China;

    Rice Univ, Dept Chem, POB 1892, Houston, TX 77005 USA;

    Rice Univ, Dept Chem, POB 1892, Houston, TX 77005 USA|Rice Univ, Richard E Smalley Inst Nanoscale Sci & Technol, Houston, TX 77005 USA;

    Beijing Univ Technol, Coll Elect Informat & Control Engn, Beijing 100124, Peoples R China;

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