Тип публикации: статья из журнала

Год издания: 2023

Идентификатор DOI: 10.1002/cptc.202300100

Ключевые слова: cyclic voltammetry, electrochemical anodization, photoelectrochemical activity, TiO2 nanotubes, water splitting

Аннотация: <jats:title>Abstract</jats:title><jats:p>A facile and eco-friendly method for activating anodic TiO<jats:sub>2</jats:sub> nanotubes (TNTs) by cyclic voltammetry (CV) is proposed, and photoelectrochemical properties of CV-activated TNTs are compared with those of non-activated TNTs and of TNTs activated by hydrogen-thermal reductionПоказать полностью. EPR and luminescence studies show that the pristine samples demonstrate rather large content of paramagnetic and luminescing defects, while hydrogenation and CV-activation lead to the different type of rearrangement of defects. TNTs activated by CV-Na<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> demonstrate significantly improved photocurrent density (2.25 mA cm<jats:sup>−2</jats:sup>) in comparison with that of the hydrogen treated and pristine ones (0.93 mA cm<jats:sup>−2</jats:sup> and 0.31 mA cm<jats:sup>−2</jats:sup>) under NUV-irradiation at 0.2 V (RHE). Enhanced photoactivity of Na<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub>-activated TNTs correlates with higher luminescence quantum yield, lowest paramagnetic defects content and larger decay time of the luminescence. Thus, a decrease in the content of defects is an important factor that reduces the non-radiative recombination of charge carriers. The activation-induced redistribution of surface and bulk defects in nanotubes explains the increased photoelectrochemical activity of TiO<jats:sub>2</jats:sub>-based anodes. Cyclic voltammetry has been proved to be a reliable method to increase the efficiency of TNTs in PEC water splitting.</jats:p>

Журнал: ChemPhotoChem

Выпуск журнала: Т.7, №9

Номера страниц: 202300100

ISSN журнала: 23670932

• Zos'ko Nikolay A. (Laboratory of Catalytic Transformations of Renewable Resources Laboratory of Molecular Spectroscopy and Analysis Institute of Chemistry and Chemical Technology, SB RAS FRC «Krasnoyarsk Science Center SB RAS» Krasnoyarsk 660036 Russia)
• Aleksandrovsky Aleksandr S. (Siberian Federal University Krasnoyarsk 660041 Russia)
• Kenova Tatyana A. (Laboratory of Catalytic Transformations of Renewable Resources Laboratory of Molecular Spectroscopy and Analysis Institute of Chemistry and Chemical Technology, SB RAS FRC «Krasnoyarsk Science Center SB RAS» Krasnoyarsk 660036 Russia)
• Gerasimova Marina A. (Siberian Federal University Krasnoyarsk 660041 Russia)
• Maksimov Nikolay G. (Laboratory of Catalytic Transformations of Renewable Resources Laboratory of Molecular Spectroscopy and Analysis Institute of Chemistry and Chemical Technology, SB RAS FRC «Krasnoyarsk Science Center SB RAS» Krasnoyarsk 660036 Russia)
• Taran Oxana P. (Siberian Federal University Krasnoyarsk 660041 Russia)

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