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Exploring the integration of CNT interwoven VY-MOF nanostructured for enhanced electrochemical performance supercapacitor device and their charge storage mechanism
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- Authors
- Mohammad Naved Khan, Mohd Shoeb, Fouzia Mashkoor, Kwang-Ju Kim, Mi-Sun Kang, Jungwon Yu, Hyan Su Bae, In-su Jang, Changyoon Jeong
- Issue Date
- 2025-08
- Citation
- Journal of Energy Storage, v.127, pp.1-15
- ISSN
- 2352-152X
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- This study introduces a pioneering bimetallic metal-organic framework (VY-MOF) integrated with carbon nanotubes (CNTs) via a probe sonication-assisted hydrothermal synthesis, leveraging H4BTC as a tetrafunctional organic linker. The VY-MOF@CNT composite uniquely combines the high surface area and redox-active sites of the Y/V bimetallic system with the conductive CNT network, overcoming traditional limitations in charge transfer kinetics and structural stability. XRD, Raman, and XPS characterization confirms the formation of a crystalline VY-MOF matrix with tailored porosity and mixed oxidation states (V3+/V4+, Y3+), while SEM/EDS validates the homogeneous CNT dispersion, creating hierarchical ion diffusion pathways. Electrochemically, the VY-MOF@CNT electrode achieves a specific capacitance of 1661 F/g at 2 A/g surpassing monometallic Y-MOF (3.3×), V-MOF (2.5×), and pristine VY-MOF (1.66×) attributed to synergistic dual charge storage: electric double-layer capacitance (EDLC) from CNTs and pseudocapacitance from Y/V redox centers. Trasatti and Dunn's analyses quantify a hybrid mechanism (b-value = 0.67) with 68 % surface-controlled contributions, while the assembled symmetric supercapacitor (SSD) delivers an exceptional 60 Wh/kg energy density at 1200 W/kg, rivaling lithium-ion capacitors. Remarkably, the device retains 92 % capacitance after 10,000 cycles at 15 A/g, demonstrating unprecedented durability for MOF-based systems. These findings highlight the composite's robustness and superior electrochemical durability, underscoring its potential as a cutting-edge electrode material for next-generation energy storage technologies. This work demonstrates a pathway for enhancing supercapacitor performance and provides a framework for bimetallic MOF-based composites with improved electrochemical functionalities.
- KSP Keywords
- Active sites, Bimetallic MOF, Bimetallic metal, Bimetallic system, CNT composite, CNT dispersion, CNT network, Carbon nano-tube(CNT), Charge storage mechanism, Charge transfer kinetics, Cutting-edge