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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

ChemElectroChem

ISSN

2196-0216

e-ISSN

—

Svazek periodika

5

Číslo periodika v rámci svazku

19

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

11

Strana od-do

2825-2835

Kód UT WoS článku

000446066100016

EID výsledku v databázi Scopus

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