A new two-fold interpenetrating metal-organic framework based on polyoxometalate: Synthesis, structure, efficient hydrogen evolution and dye degradation

• Published in: Journal of solid state chemistry 2023-07, Vol.323, p.124066, Article 124066
• Main Authors: Zhuanfang, Zhang, Enze, Fan, Shuangqi, Zhou, Zhaojun, Wu, Wenzhi, Zhang, Ming, Zhao, GuoHua, Dong
• Format: Article
• Language: English
• Subjects: Hydrogen evolution reaction; Interpenetration; Photocatalytic catalysis
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2023.124066

A new POMs-based metal–organic framework (POMOF) with interpenetrated 2-fold architecture compound: [(Ni3(bpp)3·(H2O)11(PW9ⅥW3ⅤO40)]·2H2O (1) (bpp = 3, 5′-bis(pyrid-4-yl)pyridine) has been synthesized under hydrothermally method by introducing a pyridyl-containing rigid ligand into polyoxometalate (POMs) system. In compound 1, the Ni ions simultaneously coordinate with N-donor linker bpp and O-donor linker POM to form 3D frameworks with a large stacking channel. and the 3D frameworks further interpenetrate into each other to form a 2-fold POMOFs architecture. Moreover,the as-obtained POMOF with narrow band (2.07eV) facilitates electron transfer and porous structure for mass transfer. Compound 1 had a high photocatalytic degradation activity of RhB dye with a degradation rate of 90%. At the same time, the as-prepared compound produced excellent catalytic activity and high stability for hydrogen evolution reaction (HER), which manifest an overpotential only 74.6 mV for HER (10 mA cm−2) and Tafel slope of 111 mV dec−1 in 1 M KOH. Our research provides that the as-prepared catalyst possesses bifunctional catalytic performance for both HER and dye degradation. [Display omitted] •A new compound has been constructed from PW12O403-, Ni2+ node and 3, 5′-bpp grind ligand.•It exhibits an interesting 3D POM-based structure with 2-fold interpenetration.•The compound displays excellent catalytic ability in hydrogen evolution and dye degradation.•After 2000 cycles of CV and three times of photocatalytic experiment, the compound can still maintain its catalytic activity.