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Nb2O5 nanowire photoanode sensitized by a composition-tuned CdSxSe1-x shell

Authors
Kang, Jun HaMyung, YoonChoi, Jin WoongJang, Dong MyungLee, Chi WooPark, JeungheeCha, Eun Hee
Issue Date
2012
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY, v.22, no.17, pp.8413 - 8419
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MATERIALS CHEMISTRY
Volume
22
Number
17
Start Page
8413
End Page
8419
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/109321
DOI
10.1039/c2jm16008k
ISSN
0959-9428
Abstract
Nb2O5 nanowires (NWs) were grown by the thermal oxidation of Nb foils. The thermal chemical vapor transport of CdS/CdSe powders produces Nb2O5-CdSxSe1-x core-shell NWs with complete composition tuning. In the alloy composition, CdSe-like and CdS-like phases exist in the outer and inner regions of the shell, respectively, forming unique multi-shell structures. As x increases, the thickness of the CdSe-like outer shell decreases, while that of the CdS-like inner shell increases. We fabricated photoelectrochemical (PEC) cells using the as-grown Nb2O5-CdSxSe1-x NWs and measured their photocurrents and hydrogen generation rates under AM 1.5G irradiation. The PEC cells showed excellent photoconversion efficiency, which is comparable to that of TiO2-CdSxSe1-x NWs. It indicates that the present Nb2O5 NW promises an excellent photoanode of solar cell devices. The multi-shell structures increase the PEC performance by producing novel band alignment for efficient electron-hole separation following enhanced visible-range photon absorption.
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