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Article Dans Une Revue Angewandte Chemie International Edition Année : 2017

Anisotropic metal deposition on TiO2 particles by electric-field-induced charge separation

Résumé

Deposition of metals on TiO2 semiconductor particles (M-TiO2) results in hybrid Janus objects combining the properties of both materials. One of the techniques proposed to generate Janus particles is bipolar electrochemistry (BPE). The concept can be applied in a straightforward way for the site-selective modification of conducting particles, but is much less obvious to use for semiconductors. Herein we report the bulk synthesis of anisotropic M-TiO2 particles based on the synergy of BPE and photochemistry, allowing the intrinsic limitations, when they are used separately, to be overcome. When applying electric fields during irradiation, electrons and holes can be efficiently separated, thus breaking the symmetry of particles by modifying them selectively and in a wireless way on one side with either gold or platinum. Such hybrid materials are an important first step towards high-performance designer catalyst particles, for example for photosplitting of water.

Domaines

Matériaux
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Dates et versions

hal-01587892 , version 1 (25-02-2021)

Identifiants

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Supakit Tiewcharoen, Chompunuch Warakulwit, Veronique Lapeyre, Patrick Garrigue, Lucas Fourier, et al.. Anisotropic metal deposition on TiO2 particles by electric-field-induced charge separation. Angewandte Chemie International Edition, 2017, 56 (38), pp.11431-11435. ⟨10.1002/anie.201704393⟩. ⟨hal-01587892⟩
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