Comparison of In Situ‐Fabricated Ternary NiCoMn‐Metal–Organic Frameworks versus Slurry Deposition on Porous Ni‐Foam: A Facile Approach for Enhancing Supercapacitor Performance

• Published in: Energy technology (Weinheim, Germany) Vol. 12; no. 4
• Main Authors: Abdul Karim, Muhammad Ramzan, Khalid, Wajahat, Zahid, Rida
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01-04-2024
• Subjects: Bimetals; Capacitance; Deposition; Electrochemical analysis; Electrochemistry; Electrode materials; Electrodes; Electron microscopy; Emission analysis; Energy; Energy requirements; Energy storage; Foams; Heavy metals; in situ; Investigations; Metal-organic frameworks; Oxidation; Slurries; slurry deposition; Substrates; Supercapacitors
• ISSN: 2194-4288; 2194-4296
• DOI: 10.1002/ente.202301160

Owing to the worldwide energy requirements, metal–organic frameworks (MOFs) have been extensively used as electrode material. Ternary MOFs have been of prime importance because of their characteristic of a variety of oxidation states than mono‐ and bimetallic MOFs. Herein, a novel comparison and superiority of binder‐free MOF deposition known as in situ (IN) on the substrate have been investigated over the slurry deposition method involving the excellent properties of ternary MOFs. Confirmation of MOF formation using X‐ray diffraction and investigation of its morphological features have been explored using field‐emission scanning electron microscopy. Energy dispersive X‐ray area mapping has also been integrated for conformity of uniform elemental distribution. The electrochemical properties of NiCoMn‐MOF have been investigated and the results obtained for NiCoMn deposited using IN methodology are superior due to excellent penetration of MOF inside substrate that provides the basis of excellent electrochemical properties. A specific capacitance of 1000 C g−1 at 4 A g−1 in 3‐electrode assembly has been achieved accompanied by energy and power density of 55 Wh kg−1 and 2467 W kg−1 in 2‐electrode setup. An excellent cyclic stability of about 97% has been obtained after subjecting the asymmetric supercapacitor device to 5000 charge/discharge cycles at 20 A g−1. Diffusive nature dominancy over capacitive is also observed by manipulating Dunns’ model. The superior and novel aspect of using IN deposition may pave the way for their efficient use in energy storage devices.
Metal‐organic frameworks (MOFs), resulting from metal nodes and organic linkers, play a pivotal role in contemporary energy development. Ternary MOFs, with diverse oxidation states, stand out. This study compares in situ (IN) MOF deposition to slurry deposition, emphasizing the excellence of ternary MOFs. Analyzing NiCoMn‐MOF's electrochemical properties, the IN method demonstrates superior results, showcasing a specific capacitance of 1000 C g−1, energy density of 55 Wh kg−1, and power density of 2467 W kg−1. With 97% cyclic stability and 100% of coulombic efficiency after 5000 cycles, IN deposition proves promising for efficient energy storage devices.