期刊
ELECTROCHIMICA ACTA
卷 301, 期 -, 页码 325-331出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.01.175
关键词
Coaxial carbon-TiO2 nanotube arrays; Oxygen vacancies; Photothermal effect; Hydrogen generation
资金
- National Key Research and Development Program of China [2017YFE0102700]
- National Natural Science Foundation of China [50802055, 51732007, 21802086]
- Beijing National Laboratory for Molecular Sciences Program [BNLMS201802]
In this paper, a facile one-step vacuum annealing process has been developed to fabricate the coaxial carbon-TiO2 nanotube arrays (CC-TNAs) film. The obtained composite film is composed of TiO2 nanotubes self-doped by oxygen vacancies (V(o)(center dot)s), and an ultrathin carbon layer covering on the outer wall of TiO2 nanotubes. This composite film exhibited high absorbency from UV to NIR wavelength region, high electric conductivity, and photothermal effect. As a photoanode for hydrogen generation, the film showed promising light response in Na2S/Na2SO3 aqueous solution under a broad wavelength range from UV to NIR wavelength region. The study of the working mechanism revealed that a unique non-stepped photocurrent was resulted from the photothermal effect of CC-TNAs film in the electrolyte environment. The performance of this photothermo-electrochemical (PTEC) process is determined by the co-existence of the V(o)(center dot)s and the coaxial carbons of TNAs. This study provides new insight into the design, preparation, and correlation between the structure and performance for new semiconductor-carbon nanocomposites. (C) 2019 Elsevier Ltd. All rights reserved.
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