Nickel phosphonate MOF as efficient water splitting photocatalyst

• 作者: Pablo Salcedo-Abraira Sérgio M.F.Vilela Artem A.Babaryk María Cabrero-Antonino Pedro Gregorio Fabrice Salles Sergio Navalón Hermenegildo García Patricia Horcajada
• 来源期刊: 纳米研究（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: Research Articles
• 页码范围: 450-457
• 页数: 8页
• 语种: 英文

摘要

A 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-my diffraction reveals that IEF-13 crystallizes in the triclinic space group P(1) having bi-octahedra nickel nodes and a photo/electroactive tritopic phosphonate ligand.Remarkably,this material exhibits coordinatively unsaturated nickel(Ⅱ) sites,free-PO3H2 and-PO3H acidic groups,a CO2 accessible microporosity,and an exceptional thermal and chemical stability.Further,its in-deep optoelectronic characterization evidences a photoresponsa suitable for phctocatalysis.In this sense,the phctocatalytic activity for challenging H2 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 H2 per gram using methanol as sacrificial agent,exhibiting stability,maintaining its crystal structure and allowing its recycling.Even more,170 μmol of H2 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 O2 reduction.The present work opens new avenues for further optimization of the photocatalytic activity in this type of multifunctional materials.