Journal
ELECTROCHIMICA ACTA
Volume 53, Issue 27, Pages 7941-7945Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2008.06.006
Keywords
anodization; valve metal; zinc; zinc oxide; zinc fluoride; nanowires
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Funding
- Korea Science and Engineering Foundation (KOSEF)
- Korean government (MOST) [R01-2007-000-20290-0]
- National Research Foundation of Korea [R01-2007-000-20290-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Anodization of a Zn foil was investigated in aqueous acidic and neutral electrolytes. It was found that nanowire-like structures can be prepared when it is anodized in an electrolyte containing F- ions under appropriate conditions. In particular, abundant F- ions were detected in the samples with a spiked morphology, which was revealed as ZnF2. Different pathways for the formation and dissolution of ZnO were suggested to explain the mechanism for the formation of ZnF2 nanowires. Dissolution of ZnO at a low potential is mainly attributed to chemical dissolution by H* or OH-, whereas electrochemical dissolution by anions in the electrolytes accounts for the formation of nanowires at a high potential. XRD data and XPS measurements confirm that the anodically prepared nanowire-like structure consists of ZnF2. (c) 2008 Elsevier Ltd. All rights reserved.
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