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Rapid and controlled electrochemical synthesis of crystalline niobium oxide microcones

Shaheen, Basamat S. and Davenport, Timothy C. and Salem, Hanadi G. and Haile, Sossina M. and Allam, Nageh K. (2015) Rapid and controlled electrochemical synthesis of crystalline niobium oxide microcones. MRS Communications, 5 (03). pp. 495-501. ISSN 2159-6859. https://resolver.caltech.edu/CaltechAUTHORS:20151113-100811659

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Abstract

We demonstrate the fabrication by anodization of niobium oxide microcones, several microns long, from aqueous solutions of 1 wt% hydrogen fluoride (HF) with varied sodium fluoride (NaF) concentration (0–1 M). Raman spectroscopy and x-ray diffractometer analysis revealed the as-grown microcones to be crystalline Nb_2O_(5−x) with preferred (1 0 0) and (0 1 0) orientations. The overall Nb_2O_(5−x) formation rate increased with the increasing NaF concentration, and structures as tall as 20 μm were achieved in just 20 min of anodization at 1 M NaF. Rapid formation of niobia microcones was even observed in the absence of HF at this NaF concentration. Photocatalytic activity for water oxidation was highest for microcones grown under the highest NaF concentration.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1557/mrc.2015.43DOIArticle
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=9990837&fileId=S2159685915000439PublisherArticle
ORCID:
AuthorORCID
Haile, Sossina M.0000-0002-5293-6252
Additional Information:© 2015 Materials Research Society. Received May 08 2014. Accepted June 10 2015. B. S. acknowledges financial support from the American University in Cairo via a graduate student research grant. Additional support was provided by LiOx Power Inc. and by the California Institute of Technology.
Funders:
Funding AgencyGrant Number
Cairo American University UNSPECIFIED
LiOx Power IncUNSPECIFIED
CaltechUNSPECIFIED
Issue or Number:03
Record Number:CaltechAUTHORS:20151113-100811659
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20151113-100811659
Official Citation: Basamat S. Shaheen, Timothy C. Davenport, Hanadi G. Salem, Sossina M. Haile and Nageh K. Allam (2015). Rapid and controlled electrochemical synthesis of crystalline niobium oxide microcones. MRS Communications, 5, pp 495-501. doi:10.1557/mrc.2015.43.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62094
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:18 Nov 2015 00:31
Last Modified:03 Oct 2019 09:15

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