A self-sensitized Co (II)-MOF for efficient visible-light-driven hydrogen evolution without additional cocatalysts

• Published in: Journal of solid state chemistry Vol. 304; p. 122609
• Main Authors: Li, Ting-Ting, Dang, Li-Long, Zhao, Chen-Chen, Lv, Zhuo-Yun, Yang, Xiao-Gang, Zhao, Ying, Zhang, Shu-Hua
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.12.2021
• Subjects: Hydrogen generation; Metal-organic framework; Photocatalysis; Photocurrent response; π···π stacking; Photocurrent response; Metal-organic framework; π···π stacking; Hydrogen generation; Photocatalysis
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2021.122609

Herein, a new metal-organic framework (MOF) {[Co(azpy) (bps) (H2O)]·DMF·2.3H2O}n, 1, (azpy ​= ​4,4′-azopyridine, H2bps ​= ​4, 4′- bibenzoic acid-2, 2′-sulfone (H2bps) has been synthesized by solvothermal method. Complex 1 was characterized in detail by X-ray single-crystal diffraction, elemental analysis, IR spectrum, PXRD and thermogravimetric analysis. X-ray single-crystal diffraction analysis for 1 indicates that two azpy ligands bearing unusual cis-configuration bridge two Co2+ cations, forming an interesting one-dimensional nanopore channel. And these nanopore channels finally form a three-dimensional framework by multiple π···π stacking interactions. Besides, visible-light-driven H2 production exhibited that complex 1 displayed a high-efficiently photocatalytic hydrogen generation (1.44 ​mmol ​g−1·h−1) without additional photosensitizers and cocatalysts. Moreover, the photocurrent response of 1, solid-state UV–Vis absorption spectra of 1 and free ligands were also explored. A new three-dimensional Co (II) based MOF structure was synthesized successfully by one-dimensional pore channel accumulation. The MOF displays a high-efficient photocatalytic hydrogen evolution capacity without additional photosensitizers and cocatalysts, arising from the electron transfer between the ligand and the metal in the stacking system. [Display omitted] •One new 3D Co (II) based MOF structure was synthesized successfully by one-dimensional pore channel accumulation.•The MOF displays a high-efficient photocatalytic hydrogen evolution capacity without additional photosensitizers and cocatalysts.•High-efficient photocatalytic hydrogen of the MOF arise from the electron transfer between the ligand and the metal.