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Morosini V, Chave T, Virot M, et al. Sonochemical water splitting in the presence of powdered metal oxides. Ultrason Sonochem. 2015;29:512-6doi: 10.1016/j.ultsonch.2015.11.006.
Morosini, V., Chave, T., Virot, M., Moisy, P., & Nikitenko, S. I. (2016). Sonochemical water splitting in the presence of powdered metal oxides. Ultrasonics sonochemistry, 29512-6. https://doi.org/10.1016/j.ultsonch.2015.11.006
Morosini, Vincent, et al. "Sonochemical water splitting in the presence of powdered metal oxides." Ultrasonics sonochemistry vol. 29 (2016): 512-6. doi: https://doi.org/10.1016/j.ultsonch.2015.11.006
Morosini V, Chave T, Virot M, Moisy P, Nikitenko SI. Sonochemical water splitting in the presence of powdered metal oxides. Ultrason Sonochem. 2016 Mar;29:512-6. doi: 10.1016/j.ultsonch.2015.11.006. Epub 2015 Nov 04. PMID: 26558997.
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Ultrason Sonochem. 2016 Mar;29:512-6. doi: 10.1016/j.ultsonch.2015.11.006. Epub 2015 Nov 04.

Sonochemical water splitting in the presence of powdered metal oxides.

Ultrasonics sonochemistry

Vincent Morosini, Tony Chave, Matthieu Virot, Philippe Moisy, Sergey I Nikitenko

Affiliations

  1. Institut de Chimie Séparative de Marcoule, UMR5257, CEA-CNRS-UM2-ENSCM, Centre de Marcoule, Bat. 426, BP 17171, 30207 Bagnols-sur-Cèze, France.
  2. CEA/DEN/MAR/DRCP, Nuclear Energy Division, Radiochemistry and Process Department, BP17171, 30207 Bagnols sur Cèze, France.
  3. Institut de Chimie Séparative de Marcoule, UMR5257, CEA-CNRS-UM2-ENSCM, Centre de Marcoule, Bat. 426, BP 17171, 30207 Bagnols-sur-Cèze, France. Electronic address: [email protected].

PMID: 26558997 DOI: 10.1016/j.ultsonch.2015.11.006

Abstract

Kinetics of hydrogen formation was explored as a new chemical dosimeter allowing probing the sonochemical activity of argon-saturated water in the presence of micro- and nano-sized metal oxide particles exhibiting catalytic properties (ThO2, ZrO2, and TiO2). It was shown that the conventional sonochemical dosimeter based on H2O2 formation is hardly applicable in such systems due to catalytic degradation of H2O2 at oxide surface. The study of H2 generation revealed that at low-frequency ultrasound (20 kHz) the sonochemical water splitting is greatly improved for all studied metal oxides. The highest efficiency is observed for relatively large micrometric particles of ThO2 which is assigned to ultrasonically-driven particle fragmentation accompanied by mechanochemical water molecule splitting. The nanosized metal oxides do not exhibit particle size reduction under ultrasonic treatment but nevertheless yield higher quantities of H2. The enhancement of sonochemical water splitting in this case is most probably resulting from better bubble nucleation in heterogeneous systems. At high-frequency ultrasound (362 kHz), the effect of metal oxide particles results in a combination of nucleation and ultrasound attenuation. In contrast to 20 kHz, micrometric particles slowdown the sonolysis of water at 362 kHz due to stronger attenuation of ultrasonic waves while smaller particles show a relatively weak and various directional effects.

Copyright © 2015 Elsevier B.V. All rights reserved.

Keywords: Catalysts; Mechanochemistry; Metal oxides; Nanoparticles; Sonochemistry; Water splitting

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