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Construction of CdSe@TiO 2 core‐shell nanorod arrays by electrochemical deposition for efficient visible light photoelectrochemical performance
Author(s) -
Zhuang Huaqiang,
Liu Xiaobin,
Li Fukun,
Xu Wentao,
Lin Liqin,
Cai Zhenping
Publication year - 2019
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4744
Subject(s) - nanorod , visible spectrum , deposition (geology) , materials science , electrochemistry , core (optical fiber) , optoelectronics , nanotechnology , photoelectrochemical cell , shell (structure) , chemical engineering , optics , electrode , chemistry , composite material , physics , paleontology , sediment , electrolyte , biology , engineering
Summary The CdSe@TiO 2 core‐shell nanorod arrays for photoelectrochemical (PEC) application were designed and constructed by a facile electrochemical deposition strategy. The CdSe@TiO 2 photoanodes exhibit highly efficient PEC performance under visible light irradiation, among which the CdSe shell layer thickness can be precisely adjusted by different electrodeposition time. In comparison with nude TiO 2 nanorods, the optimized CdSe@TiO 2 photoanode (TC‐500) shows a significant saturated photocurrent density of 2.1 mA/cm 2 at 0 V (vs Ag/AgCl), which is attributed to the good distribution of CdSe nanoparticles on TiO 2 nanorod arrays, the favorable band alignment, and the intimate interfacial interaction between CdSe nanoparticles and TiO 2 nanorods. The introduction of CdSe shell layer does not only improve light absorption ability but also enhances photogenerated charge carrier's transfer and separation. This current work systematically studies the accurate adjustment of CdSe shell layer thickness on TiO 2 nanorod arrays by electrochemical deposition strategy and provides a paradigm to design and fabricate heterostructure composite for PEC application.