Journal
RSC ADVANCES
Volume 2, Issue 25, Pages 9415-9422Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ra21169f
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Funding
- Hydrogen Energy R D Center
- Korean Centre for Artificial Photosynthesis [NRF-2011-C1AAA0001-2011-0030278]
- Basic Science Research Program [2012-017247]
- Ministry of Education, Science, and Technology of Republic of Korea
- Brain Korea 21, WCU [R31-30005]
- A3 Foresight Programs
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The iron oxide photoanode was modified with a graphene-carbon 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 Fe2O3-graphene 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.
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