Aligned Fe2TiO5-containing nanotube arrays with low onset potential for visible-light water oxidation
Aligned Fe2TiO5-containing nanotube arrays with low onset potential for visible-light water oxidation
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对齐的含 Fe2TiO5 纳米管阵列，具有低可见光水氧化起始电位
DOI：
10.1038/ncomms6122
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发表时间：
2014-10-01
影响因子：
16.6
通讯作者：
Wei, Shiqiang
中科院分区：
文献类型：
--
作者：
Liu, Qinghua;He, Jingfu;Wei, Shiqiang
在水分解的光电化学应用中，如何有效地利用可见光仍然是一个紧迫的挑战。在这里，我们设计并制造了生长在垂直排列的tio2纳米管阵列上的假brookite fe2tio5超薄层，可以增强光生电荷载流子的传导和利用。我们的光电阳极具有~0.2 V的低起始电位，400-600 nm辐照下的光子-电流效率高达40-50%，总能量转换效率为~2.7%。基于电化学阻抗分析和第一性原理计算，fe2tio5纳米管阵列具有各向异性的载流子输运和较长的载流子扩散长度（与传统的tio2或fe2o3光阳极相比）。fe2tio5纳米管阵列可以为设计高效、低成本的可见光光电阳极提供更多的机会。
There remains a pressing challenge in the efficient utilization of visible light in the photoelectrochemical applications of water splitting. Here, we design and fabricate pseudobrookite Fe2TiO5ultrathin layers grown on vertically aligned TiO2nanotube arrays that can enhance the conduction and utilization of photogenerated charge carriers. Our photoanodes are characterized by low onset potentials of ~0.2 V, high photon-to-current efficiencies of 40–50% under 400–600 nm irradiation and total energy conversion efficiencies of ~2.7%. The high performance of Fe2TiO5nanotube arrays can be attributed to the anisotropic charge carrier transportation and elongated charge carrier diffusion length (compared with those of conventional TiO2or Fe2O3photoanodes) based on electrochemical impedance analysis and first-principles calculations. The Fe2TiO5nanotube arrays may open up more opportunities in the design of efficient and low-cost photoanodes working in visible light for photoelectrochemical applications.