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Nickel phosphonate MOF as efficient water splitting photocatalyst

AuthorsSalcedo-Abraira, Pablo; Vilela, S.M.F.; Babaryk, Artem A.; Cabrero-Antonino, María; Gregorio, P.; Salles, Fabrice; Navalón, Sergio; García Gómez, Hermenegildo; Horcajada, Patricia
Issue Date21-Sep-2021
PublisherTsinghua University Press
Springer Nature
CitationNano Research 14: 450-457 (2021)
AbstractA novel microporous two-dimensional (2D) Ni-based phosphonate metal-organic framework (MOF; denoted as IEF-13) has been successfully synthesized by a simple and green hydrothermal method and fully characterized using a combination of experimental and computational techniques. Structure resolution by single-crystal X-ray diffraction reveals that IEF-13 crystallizes in the triclinic space group P having bi-octahedra nickel nodes and a photo/electroactive tritopic phosphonate ligand. Remarkably, this material exhibits coordinatively unsaturated nickel(II) sites, free–POH and–POH acidic groups, a CO accessible microporosity, and an exceptional thermal and chemical stability. Further, its in-deep optoelectronic characterization evidences a photoresponse suitable for photocatalysis. In this sense, the photocatalytic activity for challenging H generation and overall water splitting in absence of any co-catalyst using UV–Vis irradiation and simulated sunlight has been evaluated, constituting the first report for a phosphonate-MOF photocatalyst. IEF-13 is able to produce up to 2,200 µmol of H per gram using methanol as sacrificial agent, exhibiting stability, maintaining its crystal structure and allowing its recycling. Even more, 170 µmol of H per gram were produced using IEF-13 as photocatalyst in the absence of any co-catalyst for the overall water splitting, being this reaction limited by the O reduction. The present work opens new avenues for further optimization of the photocatalytic activity in this type of multifunctional materials. [Figure not available: see fulltext.].
Publisher version (URL)http://dx.doi.org/10.1007/s12274-020-3056-6
Identifiersdoi: 10.1007/s12274-020-3056-6
issn: 1998-0000
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