Issue 13, 2024

Highly efficient photosynthesis of hydrogen peroxide by a stable Zr(iv)-based MOF with a diamino-functionalized ligand

Abstract

Metal–organic frameworks (MOFs) have emerged as a promising class of materials for solar-driven hydrogen peroxide (H2O2) generation due to their porosity, large surface area and designable molecular building blocks; however, producing H2O2 from oxygen and water without sacrificial agents remains a major challenge. Herein, we have constructed two UiO-67-type MOFs, UiO-67-NH2 and UiO-67-(NH2)2, by a solvothermal method using 2-amino-4,4′-biphenyldicarboxylic acid and 2,2′-diamino-4,4′-biphenyldicarboxylic acid as ligands, respectively. A variety of photochemical measurements have shown that the introduction of diamino groups into UiO-67-(NH2)2 not only enhances its absorption ability for visible light, but also facilitates the separation of photogenerated electron/hole pairs. Consequently, compared to monoamino-functionalized UiO-67-NH2, UiO-67-(NH2)2 exhibits a 5.5 times higher H2O2 production rate in pure water for 1 h. A two-step one-electron oxygen reduction reaction pathway for photocatalytic H2O2 production was suggested based on a series of control experiments and active species trapping tests by electron paramagnetic resonance spectra. This work provides new insights into the regulation of functionalized MOF ligands at the molecular level and a catalytic mechanism towards MOF-based photocatalysts for H2O2 production with high activity.

Graphical abstract: Highly efficient photosynthesis of hydrogen peroxide by a stable Zr(iv)-based MOF with a diamino-functionalized ligand

Supplementary files

Article information

Article type
Paper
Submitted
03 Oct 2023
Accepted
20 Feb 2024
First published
28 Feb 2024

Dalton Trans., 2024,53, 5836-5843

Highly efficient photosynthesis of hydrogen peroxide by a stable Zr(IV)-based MOF with a diamino-functionalized ligand

Q. Zhai, Y. Ren, H. Wang, C. Liu, Z. Li and H. Jiang, Dalton Trans., 2024, 53, 5836 DOI: 10.1039/D3DT03237J

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