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Article

Borocarbonitride Layers on Titanium Dioxide Nanoribbons for Efficient Photoelectrocatalytic Water Splitting

1
Departamento de Física de Materiales, Campus de Cantoblanco, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
2
Centro de Nanociencias y Nanotecnología (CNyN), Universidad Nacional Autónoma de México (UNAM), Ensenada 22860, BC, Mexico
3
Dipartimento di Fisica, Università di Roma ‘La Sapienza’, I-00185 Rome, Italy
4
Instituto Nicolás Cabrera, Campus de Cantoblanco, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Filippo Giannazzo
Materials 2021, 14(19), 5490; https://doi.org/10.3390/ma14195490
Received: 30 August 2021 / Revised: 15 September 2021 / Accepted: 16 September 2021 / Published: 23 September 2021
Heterostructures formed by ultrathin borocarbonitride (BCN) layers grown on TiO2 nanoribbons were investigated as photoanodes for photoelectrochemical water splitting. TiO2 nanoribbons were obtained by thermal oxidation of TiS3 samples. Then, BCN layers were successfully grown by plasma enhanced chemical vapour deposition. The structure and the chemical composition of the starting TiS3, the TiO2 nanoribbons and the TiO2-BCN heterostructures were investigated by Raman spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Diffuse reflectance measurements showed a change in the gap from 0.94 eV (TiS3) to 3.3 eV (TiO2) after the thermal annealing of the starting material. Morphological characterizations, such as scanning electron microscopy and optical microscopy, show that the morphology of the samples was not affected by the change in the structure and composition. The obtained TiO2-BCN heterostructures were measured in a photoelectrochemical cell, showing an enhanced density of current under dark conditions and higher photocurrents when compared with TiO2. Finally, using electrochemical impedance spectroscopy, the flat band potential was determined to be equal in both TiO2 and TiO2-BCN samples, whereas the product of the dielectric constant and the density of donors was higher for TiO2-BCN. View Full-Text
Keywords: borocarbonitride; TiO2-BCN heterostructures; water splitting; photoelectrocatalysis; X-ray photoelectron spectroscopy; graphene analogues; hybrid structures borocarbonitride; TiO2-BCN heterostructures; water splitting; photoelectrocatalysis; X-ray photoelectron spectroscopy; graphene analogues; hybrid structures
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MDPI and ACS Style

Jiménez-Arévalo, N.; Flores, E.; Giampietri, A.; Sbroscia, M.; Betti, M.G.; Mariani, C.; Ares, J.R.; J. Ferrer, I.; Leardini, F. Borocarbonitride Layers on Titanium Dioxide Nanoribbons for Efficient Photoelectrocatalytic Water Splitting. Materials 2021, 14, 5490. https://doi.org/10.3390/ma14195490

AMA Style

Jiménez-Arévalo N, Flores E, Giampietri A, Sbroscia M, Betti MG, Mariani C, Ares JR, J. Ferrer I, Leardini F. Borocarbonitride Layers on Titanium Dioxide Nanoribbons for Efficient Photoelectrocatalytic Water Splitting. Materials. 2021; 14(19):5490. https://doi.org/10.3390/ma14195490

Chicago/Turabian Style

Jiménez-Arévalo, Nuria, Eduardo Flores, Alessio Giampietri, Marco Sbroscia, Maria Grazia Betti, Carlo Mariani, José R. Ares, Isabel J. Ferrer, and Fabrice Leardini. 2021. "Borocarbonitride Layers on Titanium Dioxide Nanoribbons for Efficient Photoelectrocatalytic Water Splitting" Materials 14, no. 19: 5490. https://doi.org/10.3390/ma14195490

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