Porous‐Alumina‐Assisted Growth of Nanostructured Anodic Films on Ti-Nb Alloys

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F18%3APU129462" target="_blank" >RIV/00216305:26620/18:PU129462 - isvavai.cz</a>

Result on the web

<a href="https://onlinelibrary.wiley.com/doi/abs/10.1002/celc.201800785" target="_blank" >https://onlinelibrary.wiley.com/doi/abs/10.1002/celc.201800785</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/celc.201800785" target="_blank" >10.1002/celc.201800785</a>

Result language

angličtina

Original language name

Porous‐Alumina‐Assisted Growth of Nanostructured Anodic Films on Ti-Nb Alloys

Original language description

Porous‐anodic‐alumina (PAA)‐assisted anodizing is employed, for the first time, for growing arrays of oxide nanocolumns on Ti-Nb alloy films with up to 58 at% Nb. Beyond about 24 at% Nb in the alloy, the system allows for high formation potentials of 250–420 V, giving columns that are 500–700 nm long, which are 100 % stable during the PAA etch. The stability worsens when lowering the Nb content in the alloy, owing to contamination of the column roots by alumina, which arises from the amorphous‐to‐crystalline transition of the anodic oxide, oxygen evolution, formation of O2‐filled nanobubbles within the roots, and development of bigger voids. The voids force the roots to regrow and spread laterally along with anodizing the surrounding Al residues, which increases alumina content in the titania‐based nanoroots. The incorporation of sufficient amounts of Nb2O5 in the anodic TiO2 hinders oxide crystallization and lowers alumina content in the roots, which stabilizes the columns. The two oxides are distributed uniformly along the columns, indicating comparable migration rates of Ti4+ and Nb5+ ions in the mixed anodic oxide. This uniform distribution, combined with possibly mixing the oxides at atomic level, is expected to narrow the band gap of the material, which is of vast importance for solar energy conversion applications.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

ChemElectroChem

ISSN

2196-0216

e-ISSN

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Volume of the periodical

5

Issue of the periodical within the volume

19

Country of publishing house

DE - GERMANY

Number of pages

11

Pages from-to

2825-2835

UT code for WoS article

000446066100016

EID of the result in the Scopus database

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