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Nano Research

Article Title

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

Keywords

N-doped graphene, silk cocoon, interconnected carbonfibers, oxygen reduction reaction, photocatalytic hydrogenproduction

Abstract

Carbon-based metal-free catalysts are a promising substitute for the rare andexpensive platinum (Pt) used in the oxygen reduction reaction. We herein reportN-doped graphene (NG) that is exquisitely integrated into highly conductiveframeworks, simultaneously providing more active sites and higher conductivity.The NG was in situ grown on carbon fibers derived from silk cocoon (SCCf) usinga simple one-step thermal treatment. The resulting product (NG-SCCf), possessinga meso-/macroporous structure with three-dimensional (3D) interconnectednetworks, exhibits an onset potential that is only 0.1 V less negative than thatof Pt/C and shows stability and methanol tolerance superior to those of Pt/C inalkaline media. Moreover, in the absence of Pt as co-catalyst, NG-SCCf shows aphotocatalytic H2 production rate of 66.0 μmol·h–1·g–1, 4.4-fold higher than thatof SCCf. This outstanding activity is intimately related to the in situ grown NG,hierarchically porous structure, and 3D interconnected networks, which notonly introduce more active sites but also enable smooth electron transfer,mass transport, and effective separation of electron-hole pairs. Considering theabundance of the green raw material in combination with easy and low-costpreparation, this work contributes to the development of advanced sustainablecatalysts in energy storage/conversion fields, such as electro- and photocatalysis.

Graphical Abstract

Publisher

Tsinghua University Press

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