Gd(III) metal-organic framework as an effective humidity sensor and its hydrogen adsorption properties. (October 2022)

• Record Type: Journal Article
• Authors: Garg, Akash; Almáši, Miroslav; Bednarčík, Jozef; Sharma, Rishabh; Rao, Vikrant Singh; Panchal, Priyanka; Jain, Ankur; Sharma, Anshu
• Is Part Of: Chemosphere. Volume 305(2022)
• Publication Date: 2022-10
• Subjects: Metal-organic framework -- MOF-76(Gd) -- Hydrogen storage -- Humidity sensing; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.135467
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Metal-organic frameworks (MOFs) represent a class of nanoporous materials built up by metal ions and organic linkers with several interesting potential applications. The present study described the synthesis and characterization of Gd(III)-based MOF with the chemical composition [Gd(BTC)(H2 O)]·DMF (BTC – trimesate, DMF = N, N′ -dimethylformamide), known as MOF-76(Gd) for hydrogen adsorption/desorption capacity and humidity sensing applications. The structure and morphology of as-synthesized material were studied using powder X-ray diffraction, scanning and transmission electron microscopy. The crystal structure of MOF-76(Gd) consists of gadolinium (III) and benzene-1, 3, 5-tricarboxylate ions, one coordinated aqua ligand and one crystallization DMF molecule. The polymeric framework of MOF-76(Gd) contains 1D sinusoidally shaped channels with sizes of 6.7 × 6.7 Å propagating along c crystallographic axis. The thermogravimetric analysis, heating infrared spectroscopy and in-situ heating powder X-ray diffraction experiments of the prepared framework exhibited thermal stability up to 550 °C. Nitrogen adsorption/desorption measurement at −196 °C showed a BET surface area of 605 m 2 g −1 and pore volume of 0.24 cm 3 g −1 . The maximal hydrogen storage capacity of MOF-76(Gd) was 1.66 wt % and 1.34 wt % −196 °C and −186 °C and pressure up to 1 bar, respectively. Finally, the humidity sensing measurements (water adsorption experiments) were performed, and the results indicate that MOF-76(Gd) is a suitable material for moisture sensing application with a fast response (11 s) and recovery time (2 s) in the relative humidity range of 11–98%. Graphical abstract: Image 1 Highlights: A simple and effective method to synthesize Gd(III) MOF is presented. Structural and Morphological properties are discussed. Investigated its humidity sensing and gas adsorption properties. H2 storage capacities at 77 K and pressure up to 20 bar are discussed.