In-situ growth of nickel-iron metal organic frameworks coupled with prussian blue analogs on a Ni foam as the binder-free electrode of battery supercapacitor hybrids

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Author list: Lai Y.-C.; Cheshideh H.; Kubendhiran S.; Kongvarhodom C.; Saukani M.; Yougbaré S.; Chen H.-M.; Wu Y.-F.; Lin L.-Y.

Publisher: Elsevier

Publication year: 2025

Journal: Journal of Power Sources (0378-7753)

Volume number: 640

ISSN: 0378-7753

eISSN: 1873-2755

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-86000751546&doi=10.1016%2fj.jpowsour.2025.236797&partnerID=40&md5=2456d888a3ec0fa341fa91f9b37545c2

Languages: English-Great Britain (EN-GB)

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Abstract

Nickel-iron metal-organic framework (NiFe-MOF) emerges as efficient active materials for battery supercapacitor hybrids (BSHs), since combining nickel and iron provides abundant redox states and MOF possesses high surface area and porosity. Prussian blue analog (PBA) is also a promising active material for energy storage, due to its open framework structure and high ionic conductivity. Selectively changing metal nodes is able to modulate the electronic structure of MOFs and improve the electrochemical properties. In this study, NiFe-MOF and PBA are firstly combined (NiFe/PBA) as the active material of BSHs through a simple ion-exchange method to prepare NiFe/PBA heterostructure composites. Reaction times are tuned to optimize performance of NiFe/PBA. NiFe-MOF and single metallic counterparts are synthesized to investigate effects of PBA and bimetals on material and electrochemical properties. The highest specific capacitance (CF) of 1795.1 F/g corresponding to the specific capacity of 1077.1 C/g are obtained for the NiFe/PBA electrode at 1 A/g, owing to its preferable sheet-like structure and trimetallic composition of Ni, Fe and Co with multiple redox states. A BSH composed of NiFe/PBA and carbon electrodes presents a maximum energy density of 24.0 Wh/kg at 800.0 W/kg, and the CF retention of 74% and Coulombic efficiency of 95% after 10,000 charge/discharge cycles. This work brings a blueprint for designing a novel MOF-PBA configuration with multiple metals and refined structure as efficient active materials for energy storage applications. © 2025 Elsevier B.V.

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