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The formation of Z-scheme CdS/CdO nanorods on FTO substrates: The shell thickness effects on the flat band potentials

Authors
Cho, Ki-HyunSung, Yun-Mo
Issue Date
6월-2017
Publisher
ELSEVIER SCIENCE BV
Keywords
Hydrogen; Z-scheme; Core/shell nanorods; PEC cell; Water splitting
Citation
NANO ENERGY, v.36, pp.176 - 185
Indexed
SCIE
SCOPUS
Journal Title
NANO ENERGY
Volume
36
Start Page
176
End Page
185
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/83264
DOI
10.1016/j.nanoen.2017.04.037
ISSN
2211-2855
Abstract
CdS/CdO core/shell nanorod photoelectrochemical electrodes were prepared and the working mechanism of n-/n-type Z-scheme band structures is proposed based upon the shell thickness variation. A mild solution chemistry enabled the vertical growth of CdS nanorods on the low-cost conductive glass substrates. The thermal decomposition of Cd(NO3)(2)center dot 4H(2)O coated on the CdS nanorod surface successfully introduced CdS/CdO core/shell nanorod electrodes. The formation of CdO shell on CdS nanorods led to the improved photoelectrochemical performance through constructing the n-/n-type Z-scheme band structure. From the Mott-Schottky and the open-circuit potential analyses, the variation in the flat band potentials were monitored to understand the change in the photovoltage of the n-/n-type Z-scheme nanorod electrodes regarding the CdO shell thickness. The core/shell nanorod electrodes having the shell thickness equal to or smaller than the space charge region width exhibited higher photovoltages than those of others. This could be the outcome of the effective charge separation coming from the absence of the bulk region in which the electron transport is disturbed by boundaries. Finally, the optimum CdO shell thickness of CdS/CdO electrodes was determined to be similar to 2 nm and their corresponding photocurrent density was measured to be similar to 4.35 mA/cm(2), which is a similar to 22% increased value compared to that of bare CdS nanorod electrodes.
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Sung, Yun Mo
공과대학 (신소재공학부)
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