4.6 Article

CNT-TiO2 core-shell structure: synthesis and photoelectrochemical characterization

Journal

RSC ADVANCES
Volume 11, Issue 52, Pages 33169-33178

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra05723e

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Funding

  1. Luxembourg National Research Fund through the MASSENA Pride program [FNR PRIDE/MASSENA/15/10935404]
  2. FNR for the Industrial Fellowship [PLASPEROX 19/13711983]

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The porous composite coatings consisting of CNT-TiO2 core-shell structures show superior performance in photo-electrochemical water splitting reactions, with a photocurrent improvement factor of over 400%. This enhancement is attributed to the increased interface area with the electrolyte and fast withdrawal of electrons, while the strong absorption properties of CNT severely limit light penetration depth.
Porous composite coatings, made of a carbon nanotube (CNT)-TiO2 core-shell structure, were synthesized by the hybrid CVD-ALD process. The resulting TiO2 shell features an anatase crystalline structure that covers uniformly the surface of the CNTs. These composite coatings were investigated as photoanodes for the photo-electrochemical (PEC) water splitting reaction. The CNT-TiO2 core-shell configuration outperforms the bare TiO2 films obtained using the same process regardless of the deposited anatase thickness. The improvement factor, exceeding 400% in photocurrent featuring a core-shell structure, was attributed to the enhancement of the interface area with the electrolyte and the electrons fast withdrawal. The estimation of the photo-electrochemically effective surface area reveals that the strong absorption properties of CNT severely limit the light penetration depth in the CNT-TiO2 system.

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