Exploring MOF-199 composites as redox-active materials for hybrid battery-supercapacitor devices

RSC Adv. 2023 Jan 18;13(5):2860-2870. doi: 10.1039/d2ra06457j. eCollection 2023 Jan 18.


Metal-organic frameworks (MOFs) have emerged as intriguing porous materials with diverse potential applications. Herein, we synthesized a copper-based MOF (MOF-199) and investigated its use in energy storage applications. Methods were adapted to intensify the electrochemical characteristics of MOF-199 by preparing composites with graphene and polyaniline (PANI). The specific capacity of the synthesized MOF in a three-electrode assembly was significantly enhanced from 88 C g-1 to 475 C g-1 and 766 C g-1 with the addition of graphene and polyaniline (PANI), respectively. Due to the superior performance of (MOF-199)/PANI, a hybrid supercapacitor was fabricated with the structure of (MOF-199)/PANI//activated carbon, which displayed an excellent maximum energy and power density of 64 W h kg-1 and 7200 W kg-1, respectively. The hybrid device exhibited an appreciable capacity retention of 92% after 1000 charge-discharge cycles. Moreover, using Dunn’s model, the capacitive and diffusive contributions as well as the k 1 and k 2 currents of the fabricated device were calculated, validating the hybrid nature of the supercapattery device. The current studies showed that MOF-199 exhibits promising electrochemical features and can be considered as potential electrode material for hybrid energy storage devices.

PMID:36756429 | PMC:PMC9847227 | DOI:10.1039/d2ra06457j


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