TY - JOUR
T1 - Photoelectrochemical performance of CdS/ZnSe core/shell nanorods grown on FTO substrates for hydrogen generation
AU - Cho, Ki Hyun
AU - Sung, Yun Mo
N1 - Funding Information:
This research was supported by National Research Foundation (NRF) of Korea grants funded by Korean government (NRF-2016R1E1A1A01942834). The authors thank Dr. H. Baik of Korea Basic Science Institute (KBSI) for kindly providing access of their HRTEM.
PY - 2017
Y1 - 2017
N2 - One-dimensional nanostructured CdS/ZnSe core/shell photoelectrodes were prepared to show improved photocatalytic properties compared to CdS thin film photoelectrodes. The enhanced surface area and the type-II energy band structure originating from the nanorod growth and ZnSe nanoparticle decoration, respectively, are attributed to the improved photoelectrochemical performance. A mild solution based approach enabled the formation of uniform and high-density CdS nanorods having a diameter and a length of ∼15–20 nm and < 1 μm, respectively. As-synthesized CdS nanorods were uniformly coated with ZnSe nanoparticles to form ZnSe shell with ∼3 nm thickness using a spin coating method. According to the energy bandgaps of CdS nanorods and ZnSe nanoparticles estimated by UV-Visible spectrum analyses, their energy band alignment was expected to be the type-II band structure. This type-II band structure could induce the charge separation of carriers in the semiconductor electrodes and in turn could accelerate the photocatalytic reactions for efficient water splitting not only at lower but also at higher bias voltages compared to CdS thin film electrodes and bare CdS nanorod electrodes.
AB - One-dimensional nanostructured CdS/ZnSe core/shell photoelectrodes were prepared to show improved photocatalytic properties compared to CdS thin film photoelectrodes. The enhanced surface area and the type-II energy band structure originating from the nanorod growth and ZnSe nanoparticle decoration, respectively, are attributed to the improved photoelectrochemical performance. A mild solution based approach enabled the formation of uniform and high-density CdS nanorods having a diameter and a length of ∼15–20 nm and < 1 μm, respectively. As-synthesized CdS nanorods were uniformly coated with ZnSe nanoparticles to form ZnSe shell with ∼3 nm thickness using a spin coating method. According to the energy bandgaps of CdS nanorods and ZnSe nanoparticles estimated by UV-Visible spectrum analyses, their energy band alignment was expected to be the type-II band structure. This type-II band structure could induce the charge separation of carriers in the semiconductor electrodes and in turn could accelerate the photocatalytic reactions for efficient water splitting not only at lower but also at higher bias voltages compared to CdS thin film electrodes and bare CdS nanorod electrodes.
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U2 - 10.1149/2.1281706jes
DO - 10.1149/2.1281706jes
M3 - Article
AN - SCOPUS:85027858625
SN - 0013-4651
VL - 164
SP - H382-H388
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 6
ER -