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Enhanced photoelectrochemical performance of {001}TiO2/{001}SrTiO3 epitaxial heterostructures

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Abstract

The anatase TiO2 films with controllable {001} highly reactive facets were fabricated on {001}SrTiO3 substrate with various total work pressure (TWP) by direct current facing-target magnetron sputtering (DCFTMS). X-ray diffraction (XRD), scanning electron microscopy (SEM), surface roughness tester (SRT), and X-ray photoelectron spectroscopy (XPS) were employed to confirmed the influence of different TWPs on the interface of TiO2/SrTiO3 heterostructured with epitaxial preferred growth of the anatase {001}TiO2 facet. The mechanisms of enhanced photoelectrochemical properties were explored by transient photocurrent (TP), current–potential (I–V), cyclic voltammetry (CV), polarization (Tafel), electrochemical impedance spectroscopy (EIS), and Mott–Schottky (M–S) curves, which can be ascribed to the formation of high-quality heterojunction between {001}TiO2 thin film and {001}SrTiO3 substrate, which suppress the recombination of photogenerated electron–hole pairs effectively.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (21406164, 21466035), the National Key Basic Research and Development Program of China (973 program, No. 2014CB239300, 2012CB720100), and the Natural Science Foundation of Tianjin (No.13JCQNJC05700). Research Fund for the Doctoral Program of Higher Education of China (20110032110037 and 20130032120019).

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    Authors and Affiliations

    1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China

      Qianqian Shang, Tao Yu, Yunling Zou & Yuqing Zhang

    2. School of Science, Tibet University, Tibet, 850000, China

      Xin Tan

    3. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, People’s Republic of China

      Tao Yu

    4. School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China

      Zhiyang Zhang

    5. Chinese Research Academy of Environmental Sciences, Beijing, 100000, China

      Siyu Wang

    6. School of Pharmaceutical Science and Technology, Tianjin, China

      Ling Zhang

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    1. Qianqian Shang
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    2. Tao Yu
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    Correspondence to Tao Yu.

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    Qianqian Shang and Tao Yu contributed equally to this work.

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    Shang, Q., Yu, T., Tan, X. et al. Enhanced photoelectrochemical performance of {001}TiO2/{001}SrTiO3 epitaxial heterostructures. J Solid State Electrochem 20, 123–132 (2016). https://doi.org/10.1007/s10008-015-2995-4

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    • DOI: https://doi.org/10.1007/s10008-015-2995-4

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