Citation: Xunfu Zhou, Qiongzhi Gao, Siyuan Yang, Yueping Fang. Carbon nanotube@silicon carbide coaxial heterojunction nanotubes as metal-free photocatalysts for enhanced hydrogen evolution[J]. Chinese Journal of Catalysis, ;2020, 41(1): 62-71. doi: S1872-2067(19)63421-2 shu

Carbon nanotube@silicon carbide coaxial heterojunction nanotubes as metal-free photocatalysts for enhanced hydrogen evolution

College of Materials and Energy, South China Agricultural University, Guangzhou 510642, Guangdong, China

Received Date: 29 April 2019
Revised Date: 3 June 2019

Fund Project: This research was supported by the National Natural Science Foundation of China (21673083, 21802046). The authors thank the Guangdong Provincial Science and Technology Project (2017A030313090, 2014A030310427).

Considerable research efforts have been devoted to developing novel photocatalysts with increased performances by hybridizing inorganic nanomaterials with carbon nanotubes. In this work, one-dimensional coaxial core-shell carbon nanotubes@SiC nanotubes were successfully synthesized via in situ growth of SiC coatings on carbon nanotubes by a vapor-solid reaction between silicon vapor and carbon nanotubes. High-resolution transmission electron microscope images show that SiC and carbon nanotubes link to form a robust heterojunction with intrinsic atomic contact, which results in efficient separation of the photogenerated electron-hole pairs on SiC and electron transfer from SiC to carbon nanotubes. Compared with those of similar materials such as pure SiC nanocrystals and SiC nanotubes, the metal-free carbon nanotubes@SiC exhibits an enhanced photocatalytic activity for hydrogen evolution, which is attributed to the enhanced light absorption and the efficient interfacial charge transfer/separation brought about by their one-dimensional coaxial nanoheterostructures. Moreover, the photocatalytic stability of the metal-free carbon nanotubes@SiC was tested for over 20 h without any obvious decay.
- Silicon carbide,
- Coaxial core-shell nanotubes,
- Nanoheterostructures,
- Charge separation,
- Hydrogen evolution
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