Photoelectrocatalytic activity of in(iii)-modified tio2 photoanodes in the visible spectrum region - Université de Lille Accéder directement au contenu
Article Dans Une Revue New Journal of Chemistry Année : 2020

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

V. V. Emets
  • Fonction : Auteur
D. A. Maslov
  • Fonction : Auteur
M. V. Tsodikov
  • Fonction : Auteur
N. A. Mayorova
  • Fonction : Auteur
A. A. Averin
  • Fonction : Auteur
A. S. Fedotov
  • Fonction : Auteur
Maya Marinova
  • Fonction : Auteur
  • PersonId : 1127621

Résumé

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.

Domaines

Catalyse
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Dates et versions

hal-04442343 , version 1 (06-02-2024)

Identifiants

Citer

V. A. Grinberg, V. V. Emets, D. A. Maslov, M. V. Tsodikov, N. A. Mayorova, et al.. Photoelectrocatalytic activity of in(iii)-modified tio2 photoanodes in the visible spectrum region. New Journal of Chemistry, 2020, New Journal of Chemistry, 44, pp.16200-16210. ⟨10.1039/d0nj03162c⟩. ⟨hal-04442343⟩
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