A molecular approach to the synthesis of platinum-decorated mesoporous graphitic carbon nitride as selective CO2reduction photocatalyst
Tasbihi, Minoo (Technische Universität Berlin. Department of Chemistry)
Fresno, Fernando (IMDEA Energy)
Álvarez Prada, Luis Ignacio (Universitat Autònoma de Barcelona. Departament de Química)
Acharjya, Amitava (Technische Universität Berlin. Institute of Chemistry)
Thomas, Arne (Technische Universität Berlin. Institute of Chemistry)
Escriche Martínez, Lluís (Universitat Autònoma de Barcelona. Departament de Química)
Romero Fernández, Nuria (Universitat Autònoma de Barcelona. Departament de Química)
Sala Román, Xavier (Universitat Autònoma de Barcelona. Departament de Química)
de la Peña O'Shea, Victor (IMDEA Energy)
García-Antón, Jordi (Universitat Autònoma de Barcelona. Departament de Química)

Fecha:	2021
Resumen:	Platinum nanoparticles (Pt-NPs) have been directly synthesized through the organometallic approach onto the surface of mesoporous graphitic carbon nitride (mpg-CN) semiconductor with two different metal loadings. Thorough multi-technique characterization reveals a very good dispersion of nanoparticles with a narrow size distribution centered at ca. 2. 5 nm, regardless of the metal loading, and composed primarily of platinum metal with a minor contribution of oxidic surface species. Compared to bare mpg-CN, the Pt-NPs decorated materials show improved charge separation properties upon band gap excitation, ascribed to electron extraction by Pt-NPs from the conduction band of mpg-CN, as demonstrated by time-resolved fluorescence measurements. The so-obtained materials show photocatalytic activity for CO2 reduction under both UV and visible light irradiation, with improved selectivity towards highly reduced products such as methanol and methane with respect to the bare semiconductor, which leads to the formation of carbon monoxide as the main product. The obtained results shed light on the pathways that determine selectivity in photocatalytic CO2 conversion, contributing to the development of selective photocatalysts, which is one of the cornerstones in this promising technology for direct solar-to-chemical energy conversion.
Ayudas:	Ministerio de Ciencia e Innovación ENE2017-89170-R Ministerio de Economía y Competitividad PID2019-104171RB-I00
Nota:	Altres ajuts: I. A.-P. acknowledges the Universitat Autònoma de Barcelona for his pre-doctoral grant. J.G.-A. acknowledges Serra Húnter Program. The authors thank the Microscopy Service of the Universitat Autònoma de Barcelona for technical assistance with TEM and SEM
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió acceptada per publicar
Materia:	Carbon nitride ; COphotoreduction ; Nanoparticles ; Platinum ; UV and visible light
Publicado en:	Journal of CO2 Utilization, Vol. 50 (AugUST 2021) , art. 101574, ISSN 2212-9820

DOI: 10.1016/j.jcou.2021.101574

Postprint 27 p, 1.4 MB

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