Aligned Fe2TiO5-containing nanotube arrays with low onset potential for visible-light water oxidation

Qinghua Liu, Jingfu He, Tao Yao, Zhihu Sun, Weiren Cheng, Shi He, Yi Xie (), Yanhua Peng, Hao Cheng, Yongfu Sun, Yong Jiang, Fengchun Hu, Zhi Xie, Wensheng Yan, Zhiyun Pan, Ziyu Wu () and Shiqiang Wei ()
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Qinghua Liu: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Jingfu He: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Tao Yao: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Zhihu Sun: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Weiren Cheng: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Shi He: Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China
Yi Xie: Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China
Yanhua Peng: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Hao Cheng: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Yongfu Sun: Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China
Yong Jiang: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Fengchun Hu: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Zhi Xie: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Wensheng Yan: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Zhiyun Pan: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Ziyu Wu: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Shiqiang Wei: National Synchrotron Radiation Laboratory, University of Science and Technology of China

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract 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 Fe2TiO5 ultrathin layers grown on vertically aligned TiO2 nanotube 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 Fe2TiO5 nanotube arrays can be attributed to the anisotropic charge carrier transportation and elongated charge carrier diffusion length (compared with those of conventional TiO2 or Fe2O3 photoanodes) based on electrochemical impedance analysis and first-principles calculations. The Fe2TiO5 nanotube arrays may open up more opportunities in the design of efficient and low-cost photoanodes working in visible light for photoelectrochemical applications.

Date: 2014
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DOI: 10.1038/ncomms6122

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