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Nano Research

, Volume 9, Issue 8, pp 2498–2509 | Cite as

N-doped graphene grown on silk cocoon-derived interconnected carbon fibers for oxygen reduction reaction and photocatalytic hydrogen production

  • Yongpeng LeiEmail author
  • Qi Shi
  • Cheng Han
  • Bing Wang
  • Nan Wu
  • Hong Wang
  • Yingde WangEmail author
Research Article

Abstract

Carbon-based metal-free catalysts are a promising substitute for the rare and expensive platinum (Pt) used in the oxygen reduction reaction. We herein report N-doped graphene (NG) that is exquisitely integrated into highly conductive frameworks, simultaneously providing more active sites and higher conductivity. The NG was in situ grown on carbon fibers derived from silk cocoon (SCCf) using a simple one-step thermal treatment. The resulting product (NG-SCCf), possessing a meso-/macroporous structure with three-dimensional (3D) interconnected networks, exhibits an onset potential that is only 0.1 V less negative than that of Pt/C and shows stability and methanol tolerance superior to those of Pt/C in alkaline media. Moreover, in the absence of Pt as co-catalyst, NG-SCCf shows a photocatalytic H2 production rate of 66.0 μmol·h–1·g–1, 4.4-fold higher than that of SCCf. This outstanding activity is intimately related to the in situ grown NG, hierarchically porous structure, and 3D interconnected networks, which not only introduce more active sites but also enable smooth electron transfer, mass transport, and effective separation of electron-hole pairs. Considering the abundance of the green raw material in combination with easy and low-cost preparation, this work contributes to the development of advanced sustainable catalysts in energy storage/conversion fields, such as electro- and photocatalysis.

Keywords

N-doped graphene silk cocoon interconnected carbon fibers oxygen reduction reaction photocatalytic hydrogen production 

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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.College of Basic EducationNational University of Defense TechnologyChangshaChina
  2. 2.Science and Technology on Advanced Ceramic Fiber and Composites LaboratoryNational University of Defense TechnologyChangshaChina
  3. 3.College of Materials Science and EngineeringWuhan Textile UniversityWuhanChina
  4. 4.Luoyang Ship Material Research InstituteLuoyangChina

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