Anodic TiO2 nanotube walls reconstructed: Inner wall replaced by ALD TiO2 coating

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F21%3A39918168" target="_blank" >RIV/00216275:25310/21:39918168 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26620/21:PU141850

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0169433221003822" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0169433221003822</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apsusc.2021.149306" target="_blank" >10.1016/j.apsusc.2021.149306</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Anodic TiO2 nanotube walls reconstructed: Inner wall replaced by ALD TiO2 coating

Popis výsledku v původním jazyce

A reconstruction process of TiO2 nanotube (TNT) layers towards their superior photoelectrochemical performance and photocatalytic activity is presented. At first, TNT layers (similar to 5 mu m thick, similar to 250 nm in diameter) were prepared via electrochemical anodization to obtain double-wall (DW) TNT layers. Second, a selective chemical treatment was conducted to etch the inner wall, yielding single-wall (SW) TNT layers. Third, TNT layers were coated by an additional approx. 5.5 nm, 11 nm, and 16 nm thick TiO2 coatings, respectively, using Atomic Layer Deposition (ALD). A pronounced increase in the incident photon-to-electron conversion efficiency (reaching similar to 85% at lambda - 350 nm) was achieved on SW TNT layers coated with 11 nm thick ALD coatings compared to SW without coating (similar to 35% at lambda = 350 nm). This is due to the optimal thickness of the ALD TiO2 coating that passivates surface states and improves the separation of the photogenerated charge carriers. Photocatalytic performance of SW TNT layers with 11 nm thick ALD coatings (rate constant; k = 0.1156 min(-1)) was increased by approx. 10-times compared to that of the nowadays most reported blank DW TNT layers (rate constant; k = 0.0119 min(-1)).

Název v anglickém jazyce

Anodic TiO2 nanotube walls reconstructed: Inner wall replaced by ALD TiO2 coating

Popis výsledku anglicky

A reconstruction process of TiO2 nanotube (TNT) layers towards their superior photoelectrochemical performance and photocatalytic activity is presented. At first, TNT layers (similar to 5 mu m thick, similar to 250 nm in diameter) were prepared via electrochemical anodization to obtain double-wall (DW) TNT layers. Second, a selective chemical treatment was conducted to etch the inner wall, yielding single-wall (SW) TNT layers. Third, TNT layers were coated by an additional approx. 5.5 nm, 11 nm, and 16 nm thick TiO2 coatings, respectively, using Atomic Layer Deposition (ALD). A pronounced increase in the incident photon-to-electron conversion efficiency (reaching similar to 85% at lambda - 350 nm) was achieved on SW TNT layers coated with 11 nm thick ALD coatings compared to SW without coating (similar to 35% at lambda = 350 nm). This is due to the optimal thickness of the ALD TiO2 coating that passivates surface states and improves the separation of the photogenerated charge carriers. Photocatalytic performance of SW TNT layers with 11 nm thick ALD coatings (rate constant; k = 0.1156 min(-1)) was increased by approx. 10-times compared to that of the nowadays most reported blank DW TNT layers (rate constant; k = 0.0119 min(-1)).

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

2021

Kód důvěrnosti údajů

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

Název periodika

Applied Surface Science

ISSN

0169-4332

e-ISSN

1873-5584

Svazek periodika

549

Číslo periodika v rámci svazku

May

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

149306

Kód UT WoS článku

000630051900001

EID výsledku v databázi Scopus

2-s2.0-85101076278