Investigating and correlating photoelectrochemical, photocatalytic, and antimicrobial properties of $$\hbox {TiO}_2$$ TiO 2 nanolayers

Investigating and correlating photoelectrochemical, photocatalytic, and antimicrobial properties of $$\hbox {TiO}_2$$ TiO 2 nanolayers

Abstract Semiconducting transition metal oxides such as $$\hbox {TiO}_2$$ TiO 2 are promising photo(electro)catalysts for solar water splitting and photoreduction of $$\hbox {CO}_2$$ CO 2 as well as for antibacterial, self-, water and air-cleaning coatings and admixtures in paints, building material...

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Autores principales: Volker Seiß, Uta Helbig, Ralf Lösel, Maik Eichelbaum
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Publicado: Nature Portfolio 2021
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Acceso en línea:https://doaj.org/article/ebd9e5debf4245768a64764b39c13286
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spelling oai:doaj.org-article:ebd9e5debf4245768a64764b39c132862021-11-14T12:19:34ZInvestigating and correlating photoelectrochemical, photocatalytic, and antimicrobial properties of $$\hbox {TiO}_2$$ TiO 2 nanolayers10.1038/s41598-021-01165-x2045-2322https://doaj.org/article/ebd9e5debf4245768a64764b39c132862021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01165-xhttps://doaj.org/toc/2045-2322Abstract Semiconducting transition metal oxides such as $$\hbox {TiO}_2$$ TiO 2 are promising photo(electro)catalysts for solar water splitting and photoreduction of $$\hbox {CO}_2$$ CO 2 as well as for antibacterial, self-, water and air-cleaning coatings and admixtures in paints, building materials, on window glass or medical devices. In photoelectrocatalytic applications $$\hbox {TiO}_2$$ TiO 2 is usually used as photoanode only catalyzing the oxidation reaction. In coatings and admixtures $$\hbox {TiO}_2$$ TiO 2 works as heterogeneous catalyst and has to catalyze a complete redox cycle. While photoelectrochemical charge transport parameters are usually quite well accessible by electrochemical measurements, the quantitative description of photocatalytic properties is more challenging. Here, we present a systematic structural, photoelectrocatalytic, photocatalytic and antimicrobial study to understand if and how photoelectrochemical parameters can be used to predict the photocatalytic activity of $$\hbox {TiO}_2$$ TiO 2 . For this purpose $$\hbox {TiO}_2$$ TiO 2 thin films on flourine-doped tin oxide substrates were prepared and annealed at temperatures between 200 and 600 $$^{\circ }\hbox {C}$$ ∘ C . The film morphologies and thicknesses were studied by GIXRD, FESEM, and EDX. Photoelectrochemical properties were measured by linear sweep voltammetry, photoelectrochemical impedance spectroscopy, chopped light chronoamperometry, and intensity modulated photocurrent/ photovoltage spectroscopy. For comparison, photocatalytic rate constants were determined by methylene blue degradation and Escherichea coli inactivation and correlated with the deduced photoelectrocatalytic parameters. We found that the respective photoactivities of amorphous and crystalline $$\hbox {TiO}_2$$ TiO 2 nanolayers can be best correlated, if the extracted photoelectrochemical parameters such as charge transfer and recombination rates, charge transfer efficiencies and resistances are measured close to the open circuit potential (OCP). Hence, the interfacial charge transport parameters at the OCP can be indeed used as descriptors for predicting and understanding the photocatalytic activity of $$\hbox {TiO}_2$$ TiO 2 coatings.Volker SeißUta HelbigRalf LöselMaik EichelbaumNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-16 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Volker Seiß
Uta Helbig
Ralf Lösel
Maik Eichelbaum
Investigating and correlating photoelectrochemical, photocatalytic, and antimicrobial properties of $$\hbox {TiO}_2$$ TiO 2 nanolayers
description Abstract Semiconducting transition metal oxides such as $$\hbox {TiO}_2$$ TiO 2 are promising photo(electro)catalysts for solar water splitting and photoreduction of $$\hbox {CO}_2$$ CO 2 as well as for antibacterial, self-, water and air-cleaning coatings and admixtures in paints, building materials, on window glass or medical devices. In photoelectrocatalytic applications $$\hbox {TiO}_2$$ TiO 2 is usually used as photoanode only catalyzing the oxidation reaction. In coatings and admixtures $$\hbox {TiO}_2$$ TiO 2 works as heterogeneous catalyst and has to catalyze a complete redox cycle. While photoelectrochemical charge transport parameters are usually quite well accessible by electrochemical measurements, the quantitative description of photocatalytic properties is more challenging. Here, we present a systematic structural, photoelectrocatalytic, photocatalytic and antimicrobial study to understand if and how photoelectrochemical parameters can be used to predict the photocatalytic activity of $$\hbox {TiO}_2$$ TiO 2 . For this purpose $$\hbox {TiO}_2$$ TiO 2 thin films on flourine-doped tin oxide substrates were prepared and annealed at temperatures between 200 and 600 $$^{\circ }\hbox {C}$$ ∘ C . The film morphologies and thicknesses were studied by GIXRD, FESEM, and EDX. Photoelectrochemical properties were measured by linear sweep voltammetry, photoelectrochemical impedance spectroscopy, chopped light chronoamperometry, and intensity modulated photocurrent/ photovoltage spectroscopy. For comparison, photocatalytic rate constants were determined by methylene blue degradation and Escherichea coli inactivation and correlated with the deduced photoelectrocatalytic parameters. We found that the respective photoactivities of amorphous and crystalline $$\hbox {TiO}_2$$ TiO 2 nanolayers can be best correlated, if the extracted photoelectrochemical parameters such as charge transfer and recombination rates, charge transfer efficiencies and resistances are measured close to the open circuit potential (OCP). Hence, the interfacial charge transport parameters at the OCP can be indeed used as descriptors for predicting and understanding the photocatalytic activity of $$\hbox {TiO}_2$$ TiO 2 coatings.
format article
author Volker Seiß
Uta Helbig
Ralf Lösel
Maik Eichelbaum
author_facet Volker Seiß
Uta Helbig
Ralf Lösel
Maik Eichelbaum
author_sort Volker Seiß
title Investigating and correlating photoelectrochemical, photocatalytic, and antimicrobial properties of $$\hbox {TiO}_2$$ TiO 2 nanolayers
title_short Investigating and correlating photoelectrochemical, photocatalytic, and antimicrobial properties of $$\hbox {TiO}_2$$ TiO 2 nanolayers
title_full Investigating and correlating photoelectrochemical, photocatalytic, and antimicrobial properties of $$\hbox {TiO}_2$$ TiO 2 nanolayers
title_fullStr Investigating and correlating photoelectrochemical, photocatalytic, and antimicrobial properties of $$\hbox {TiO}_2$$ TiO 2 nanolayers
title_full_unstemmed Investigating and correlating photoelectrochemical, photocatalytic, and antimicrobial properties of $$\hbox {TiO}_2$$ TiO 2 nanolayers
title_sort investigating and correlating photoelectrochemical, photocatalytic, and antimicrobial properties of $$\hbox {tio}_2$$ tio 2 nanolayers
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/ebd9e5debf4245768a64764b39c13286
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AT utahelbig investigatingandcorrelatingphotoelectrochemicalphotocatalyticandantimicrobialpropertiesofhboxtio2tio2nanolayers
AT ralflosel investigatingandcorrelatingphotoelectrochemicalphotocatalyticandantimicrobialpropertiesofhboxtio2tio2nanolayers
AT maikeichelbaum investigatingandcorrelatingphotoelectrochemicalphotocatalyticandantimicrobialpropertiesofhboxtio2tio2nanolayers
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