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Enhanced photoelectrochemical and hydrogen production activity of aligned CdS nanowire with anisotropic transport properties

Authors
Kim, WooyulMonllor-Satoca, DamianChae, Weon-SikMahadik, Mahadeo A.Jang, Jum Suk
Issue Date
Jan-2019
Publisher
ELSEVIER
Keywords
Aligned CdS; Nanowire; Solvothermal synthesis; Photocurrent; Hydrogen production
Citation
APPLIED SURFACE SCIENCE, v.463, pp.339 - 347
Journal Title
APPLIED SURFACE SCIENCE
Volume
463
Start Page
339
End Page
347
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/3859
DOI
10.1016/j.apsusc.2018.08.127
ISSN
0169-4332
Abstract
Various solar conversion materials with 1D nanostructure have been developed and are being widely investigated for various solar fuel generation applications. In this study, aligned and non-aligned CdS nanowires (NWs) were synthesized on Cd foil or in solution via solvothermal processes. In the case of aligned CdS NWs, the relative intensity of the (0 0 2) diffraction peak was higher than that of the non-aligned CdS NWs, which indicated that the NWs grew preferentially in the (0 0 1) direction. The systematic comparison between the photoelectrochemical properties of both electrodes revealed that the aligned CdS NW electrode displayed markedly enhanced photocurrent (by a factor of 7), photoelectrochemical hydrogen production (by a factor of 10), and photostability in comparison with those of the non-aligned NWs electrode fabricated on FTO glass. Resistance (R-mu) through the inner part of the aligned CdS NWs was very small due to a low grain-boundary resistance (by a factor of 130). This low resistance induced efficient charge transfer, reducing the charge recombination loss and assisting the charge transport along the axial direction of the aligned NWs. Time-resolved photoluminescence spectroscopy confirmed that the charge separation in the aligned CdS NWs is longer than that in the non-aligned CdS NWs (by a factor of 1.6).
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공과대학 > 화공생명공학부 > 1. Journal Articles

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