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Exploring the Optical and Energetic Properties of a Co(II)-Based Mixed Ligand MOF
Dhouha Abid1, Issam Mjejri2, Rim Jaballi1
1Laboratory Physical-Chemistry of Solid State, Faculty of Sciences of Sfax, University of Sfax, BP 802, Route de Soukra, Sfax 3018, Tunisia.
Inorganic Chemistry
|March 29, 2024
Summary
A novel Cobalt(II)-based metal-organic framework (MOF) exhibits excellent electrochemical properties for high-performance Li-ion batteries. Its unique structure and high surface area contribute to impressive capacity retention and rate capability.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Electrochemistry
Background:
- Metal-organic frameworks (MOFs) are recognized for their porosity and surface area, driving research into diverse applications.
- Cobalt(II)-based MOFs are of particular interest due to their versatile coordination chemistry and potential catalytic and electrochemical properties.
Purpose of the Study:
- To synthesize and characterize a novel Cobalt(II)-based mixed ligand metal-organic framework.
- To investigate the optical and electrochemical properties of the synthesized MOF for potential energy storage applications.
Main Methods:
- Synthesis of a Co(II)-based mixed ligand MOF: Co 4(HTrz)2(d-cam)2.5(μ-OH)3.
- Characterization of the 3D framework structure and analysis of helical chains and ligand connectivity.
- Optical absorption spectroscopy to determine the optical gap energy and assess semiconducting properties.
- Electrochemical testing, including cyclic voltammetry and charge-discharge cycling, to evaluate performance in Li-ion batteries.
Main Results:
- The synthesized MOF, Co 4(HTrz)2(d-cam)2.5(μ-OH)3, possesses a 3D framework with helical chains linked by d-camphorate ligands.
- The material exhibits a wide visible light absorption range with an optical gap of 3.7 eV, indicating semiconducting behavior.
- Demonstrated excellent electrochemical performance with high reversibility, cyclability, and specific capacity up to 100 cycles at 0.1 mV·s-1 and 50 mA·g-1.
- Achieved impressive rate capability in Li-ion charge/discharge processes, attributed to a surface area of 348.294 m2·g-1 and pore size of 20.448 Å.
Conclusions:
- The novel Co(II)-based MOF shows promising semiconducting properties and efficient light absorption.
- The material's remarkable electrochemical stability, capacity retention, and rate capability make it a strong candidate for high-performance Li-ion batteries.
- Synergistic effects of high surface area and defined pore structure are key to its electrochemical performance.
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