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<p>The development of advanced electrode materials remains critical for next-generation energy storage systems. In this study, bimetallic Zn-based metal–organic frameworks (MOFs) incorporating Co<sup>2</sup>⁺ and Cu<sup>2</sup>⁺ were synthesized via a microwave-assisted method using phenyl phosphinic acid as a bridging ligand. Structural analysis revealed that Zn/Cu-MOF exhibits characteristic sodalite-type zeolitic imidazolate frameworks (ZIFs). In contrast, Zn/Co-MOF exhibited layered phosphinate coordination framework characteristics, indicating metal-dependent structural evolution. Electrochemical measurements demonstrated mixed electric double-layer and pseudocapacitive behavior, with Zn/Co-MOF (1:1) delivering a maximum specific capacitance of 464&#xa0;F&#xa0;g⁻<sup>1</sup>. Equivalent-circuit fitting of impedance data confirmed reduced charge-transfer resistance in optimized compositions. The results highlight that combining microwave-assisted synthesis, phosphinate ligands, and compositional tuning provides an effective pathway for designing high-performance MOF-based supercapacitor electrodes.</p>

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Synthesis of mixed-metal Zn-based metal–organic frameworks via microwave-assisted method for supercapacitor applications

  • 期刊论文

  • 发表日期：

    2026年7月4日

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  • Juvence L. Nguefack,
  • Onyekachi Nwakanma,
  • Nada Al Taisan,
  • Adil Alshoaibi,
  • Assumpta C. Nwanya,
  • Chunyu Zhu,
  • Joshua Chidiebere Mba,
  • Paul Ejikeme,
  • Fabian I. Ezema

摘要

The development of advanced electrode materials remains critical for next-generation energy storage systems. In this study, bimetallic Zn-based metal–organic frameworks (MOFs) incorporating Co2⁺ and Cu2⁺ were synthesized via a microwave-assisted method using phenyl phosphinic acid as a bridging ligand. Structural analysis revealed that Zn/Cu-MOF exhibits characteristic sodalite-type zeolitic imidazolate frameworks (ZIFs). In contrast, Zn/Co-MOF exhibited layered phosphinate coordination framework characteristics, indicating metal-dependent structural evolution. Electrochemical measurements demonstrated mixed electric double-layer and pseudocapacitive behavior, with Zn/Co-MOF (1:1) delivering a maximum specific capacitance of 464 F g⁻1. Equivalent-circuit fitting of impedance data confirmed reduced charge-transfer resistance in optimized compositions. The results highlight that combining microwave-assisted synthesis, phosphinate ligands, and compositional tuning provides an effective pathway for designing high-performance MOF-based supercapacitor electrodes.