Electrochemical Properties of Transparent Conducting Films of Tantalum-Doped Titanium Dioxide

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F17%3A00471904" target="_blank" >RIV/61388955:_____/17:00471904 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.electacta.2017.02.124" target="_blank" >http://dx.doi.org/10.1016/j.electacta.2017.02.124</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.electacta.2017.02.124" target="_blank" >10.1016/j.electacta.2017.02.124</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Electrochemical Properties of Transparent Conducting Films of Tantalum-Doped Titanium Dioxide

Popis výsledku v původním jazyce

Highly conducting, optically transparent Ta-doped TiO2 (anatase) thin films are grown on ordinary sodalime glass substrates by pulsed-laser deposition. They exhibit quasi-reversible cyclic voltammograms of Fe(CN)(6)(3/4) and dimethylviologen redox couples, mimicking the electrochemical activity of F-doped SnO2 (FTO). Hence, our Ta-doped titania films can prospectively replace FTO, e.g. in homo-junction dyesensitized and perovskite solar cells. However, these films are idle for the Ru(bpy)(3)(2+) oxidation, which is attributed to the space-charge barrier. The flatband potential of our Ta-doped TiO2 is comparable to that of an undoped reference film and/or of the pristine anatase single-crystal electrode. Our films show photoelectrochemical activity upon irradiation with UV light at potentials positive to flatband. The UV-photocurrents decrease proportionally to the increase of Ta-content. The Li-insertion ability analogously decreases with increasing Ta-content. This is attributed to the positive charge of Ta5+ cations which occupy the Ti4+ sites in anatase lattice and thus impede the Li+-transport. Consistent with the quasi-metallic nature of our films, the Li-extraction peak in cyclic voltammograms shows no cut at larger potentials. (C) 2017 Elsevier Ltd. All rights reserved.

Název v anglickém jazyce

Electrochemical Properties of Transparent Conducting Films of Tantalum-Doped Titanium Dioxide

Popis výsledku anglicky

Highly conducting, optically transparent Ta-doped TiO2 (anatase) thin films are grown on ordinary sodalime glass substrates by pulsed-laser deposition. They exhibit quasi-reversible cyclic voltammograms of Fe(CN)(6)(3/4) and dimethylviologen redox couples, mimicking the electrochemical activity of F-doped SnO2 (FTO). Hence, our Ta-doped titania films can prospectively replace FTO, e.g. in homo-junction dyesensitized and perovskite solar cells. However, these films are idle for the Ru(bpy)(3)(2+) oxidation, which is attributed to the space-charge barrier. The flatband potential of our Ta-doped TiO2 is comparable to that of an undoped reference film and/or of the pristine anatase single-crystal electrode. Our films show photoelectrochemical activity upon irradiation with UV light at potentials positive to flatband. The UV-photocurrents decrease proportionally to the increase of Ta-content. The Li-insertion ability analogously decreases with increasing Ta-content. This is attributed to the positive charge of Ta5+ cations which occupy the Ti4+ sites in anatase lattice and thus impede the Li+-transport. Consistent with the quasi-metallic nature of our films, the Li-extraction peak in cyclic voltammograms shows no cut at larger potentials. (C) 2017 Elsevier Ltd. All rights reserved.

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

<a href="/cs/project/GA13-07724S" target="_blank" >GA13-07724S: Materiálové inženýrství pro inovativní Graetzelovy solární články</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Electrochimica acta

ISSN

0013-4686

e-ISSN

—

Svazek periodika

232

Číslo periodika v rámci svazku

APR 2017

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

44-53

Kód UT WoS článku

000398327300007

EID výsledku v databázi Scopus

2-s2.0-85014086952