Graphene-carbon nanotube composite as an effective conducting scaffold to enhance the photoelectrochemical water oxidation activity of a hematite film
Graphene-carbon nanotube composite as an effective conducting scaffold to enhance the photoelectrochemical water oxidation activity of a hematite film
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DOI：
10.1039/c2ra21169f
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发表时间：
2012-01-01
期刊：
影响因子：
3.9
通讯作者：
Lee, Jae Sung
中科院分区：
文献类型：
--
作者：
Kim, Jae Young;Jang, Ji-Wook;Lee, Jae Sung
采用石墨烯-碳纳米管（CNT）复合导电支架对氧化铁光阳极进行改性，在光电化学水裂解电池中实现了Fe 2 O3颗粒到透明导电氧化物基底的有效电荷转移。与裸Fe 2 O3光阳极相比，Fe 2 O3-复合光阳极在1.23 V vs. RHE下显示出530%的光电流增加，而Fe 2 O3-CNT和Fe 2 O3-石墨烯光阳极的增加分别仅为200和240%。复合支架的这种显着的性能增强归因于由1D CNT和2D石墨烯形成的3D样结构诱导的协同效应。它们成为彼此的间隔物，形成更开放和高度暴露的结构，其中2D石墨烯和1D CNT都可以以更少自团聚的形式存在，从而不仅扩大了导电支架与Fe 2 O3颗粒之间的接触面积，而且部分恢复了石墨烯和CNT的固有导电能力。
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.