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Catalysts 2019, 9(3), 285; https://doi.org/10.3390/catal9030285

Photocatalytic Hydrogen Evolution Using Bi-Metallic (Ni/Pt) Na2Ti3O7 Whiskers: Effect of the Deposition Order

1
Facultad de Ingeniería Civil-Departamento de Ecomateriales y Energía, Universidad Autónoma de Nuevo León, Cd. Universitaria, 66455 San Nicolás de los Garza, N.L., Mexico
2
Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besós, Spain
3
Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava #6, 78290 San Luis Potosí, S.L.P., Mexico
*
Authors to whom correspondence should be addressed.
Received: 15 February 2019 / Revised: 7 March 2019 / Accepted: 15 March 2019 / Published: 20 March 2019
(This article belongs to the Section Photocatalysis)
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Abstract

Photocatalytic hydrogen production through ethanol photo-reforming using Na2Ti3O7 whiskers increases if the sodium titanate is decorated with well-known metallic catalysts such as Ni and Pt. Whereas wet impregnation with nickel gives only a slight increase in the activity, photo-deposition of Pt increased the H2 production by more than one order of magnitude. Through the combination of both co-catalysts (Ni and Pt) a superior performance in terms of H2 production is further observed. However, hydrogen yield is largely enhanced (almost three-fold), up to 778 μmol·g−1·h−1, if the Pt is photo-deposited on the surface of the catalyst before wet impregnation with Ni species (NTO/Pt/Ni) compared to H2 yield (283 μmol·g−1·h−1) achieved with the catalyst prepared in the reverse order (NTO/Ni/Pt). Structural, morphological, optical, and chemical characterization was carried out in order to correlate physicochemical properties with their photocatalytic activity. The X-ray photoelectron spectroscopy (XPS) results show a higher concentration of Pt2+ species if this metallic layer is under the nickel oxide layer. Moreover, X-ray diffraction patterns (XRD) show that Na2Ti3O7 surface is modified for both metal decoration processes. View Full-Text
Keywords: Na2Ti3O7; metal deposition; photo-reforming Na2Ti3O7; metal deposition; photo-reforming
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Garay-Rodríguez, L.F.; Murcia-López, S.; Andreu, T.; Moctezuma, E.; Torres-Martínez, L.M.; Morante, J.R. Photocatalytic Hydrogen Evolution Using Bi-Metallic (Ni/Pt) Na2Ti3O7 Whiskers: Effect of the Deposition Order. Catalysts 2019, 9, 285.

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