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Issue 25, 2012
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Graphene–carbon nanotube composite as an effective conducting scaffold to enhance the photoelectrochemical water oxidation activity of a hematite film

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Abstract

The iron oxide photoanode was modified with a graphenecarbon nanotube (CNT) composite conducting scaffold for efficient charge transfer from Fe2O3 particles to transparent conducting oxide substrate in photoelectrochemical water splitting cells. The Fe2O3–composite photoanode showed a photocurrent increase of 530% compared with to the bare Fe2O3 photoanode at 1.23 V vs. RHE, while the increase was only 200 and 240% for Fe2O3–CNT and Fe2O3graphene photoanodes, respectively. This remarkable performance enhancement by the composite scaffold was attributed to synergistic effects induced by the formation of a 3D-like architecture from 1D CNT and 2D graphene. They become a spacer for each other forming a more open and highly exposed structure, in which both 2D graphene and 1D CNT can exist in the forms with much less self-agglomeration, thus not only enlarging the contact area between the conducting scaffold and Fe2O3 particles but also recovering in part the intrinsic conducting ability of graphene and CNT.

Graphical abstract: Graphene–carbon nanotube composite as an effective conducting scaffold to enhance the photoelectrochemical water oxidation activity of a hematite film

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Supplementary files

Article information


Submitted
12 Jun 2012
Accepted
07 Aug 2012
First published
08 Aug 2012

RSC Adv., 2012,2, 9415-9422
Article type
Paper

Graphenecarbon nanotube composite as an effective conducting scaffold to enhance the photoelectrochemical water oxidation activity of a hematite film

J. Young Kim, J. Jang, D. Hyun Youn, J. Yul Kim, E. Sun Kim and J. Sung Lee, RSC Adv., 2012, 2, 9415
DOI: 10.1039/C2RA21169F

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