Titre :

Photoelectrocatalytic activity of in(iii)-modified tio2 photoanodes in the visible spectrum region

Auteur(s) :

Grinberg, V. A. [Auteur]
Russian Academy of Sciences [Moscow] [RAS]
Emets, V. V. [Auteur]
Maslov, D. A. [Auteur]
Tsodikov, M. V. [Auteur]
Mayorova, N. A. [Auteur]
Averin, A. A. [Auteur]
Fedotov, A. S. [Auteur]
Marinova, Maya [Auteur]
Institut Chevreul - FR2638
Simon, Pardis [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Titre de la revue :

New Journal of Chemistry

Nom court de la revue :

New J. Chem.

Numéro :

44

Pagination :

16200-16210

Date de publication :

2020-08-26

ISSN :

1144-0546

Discipline(s) HAL :

Chimie/Catalyse

Résumé en anglais : [en]

Nanocrystalline film photoanodes of titanium dioxide modified with In(III) ions in the concentration range from 1.0 to 10 mass% (0.23 to 2.52 at%) are manufactured using the sol–gel method. Their physicochemical characteristics ...
Lire la suite >Nanocrystalline film photoanodes of titanium dioxide modified with In(III) ions in the concentration range from 1.0 to 10 mass% (0.23 to 2.52 at%) are manufactured using the sol–gel method. Their physicochemical characteristics and the structure of In-containing compounds on the TiO2 surface are investigated via transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-vis absorption spectroscopy. The photoelectrocatalytic activity of these anodes in the reactions of methanol and formic acid electrooxidation studied under illumination with monochromatic light (369 and 461 nm; 7.5 and 10 mW cm−2, respectively) and visible light (a sunlight simulator; 100 mW cm−2) is shown to decrease symbatically with an increase in indium content. It is also shown that a selective photoelectrooxidation of methanol is observed for titanium dioxide modified with 0.23 at% In in a potential region of (−780 ÷ −550 mV). Using photocurrent modulation spectroscopy (IMPS), the recombination rate constants and the charge carrier transfer efficiency are determined under illumination of the modified photoanode with monochromatic light (369 nm; 7.5 mW cm−2) at a potential of −0.8 V in a solution of 0.1 M KOH containing methanol. It is demonstrated that the doping of titanium dioxide with 0.23 at% In promotes both an increase in the current of electron–hole pair generation and a decrease in recombination losses.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Date de dépôt :

2022-03-02T07:13:17Z
2024-02-06T16:19:26Z