Herein, we propose an effective strategy to enhance the electrochemical activity of metal organic framework-based (MOF) electrode material for electrochemical capacitors. The fabrication involves the synthesis of CuO nanowires on...

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Metal sulfides delivered much better electrochemical performance over metal oxides due to the extended potential window with high conductivity and therefore are much investigated in the field of energy storage applications. Herein, binder-free two-dimensional bimetallic (ZnS/FeS) interconnected composite nanosheet arrays are synthesized on carbon cloth (2D-ZFS@CC) as an innovative negative electrode material for supercapacitors. The 2D-ZFS@CC exhibits improved capacitance (1367.5 F g–1/1641 C g–1 at 3 A g–1), rate-capability (58.5% at 10-fold high current density), and capacitance retention (87%) over bimetallic oxide (ZnFe2O4). This is accomplished by intelligently regulating the morphology to generate numerous pores with a wide accessible surface area and high porosity, which favors high capacitance, whereas the binder-free nature of the active material promotes fast charge transfer characteristics. Moreover, the kinetic analysis suggested that the 2D-ZFS@CC electrode stored charge based on the hybrid charge storage mechanism with b values of 0.70 and 0.72 for anodic and cathodic peaks, respectively. These results demonstrate the significant potential application of 2D-ZFS@CC as a negative electrode material for next-generation supercapacitor electrodes.

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One of the most exciting new developments in energy storage technology is Zn‐ion hybrid supercapacitors (ZHSCs). ZHSCs combine Zn‐ion batteries with supercapacitors (SCs) to address the energy and power needs of portable devices and electric automobiles. Low energy density and the development of cathode material are significant issues for ZHSCs. This review provides an in‐depth investigation of charge storage mechanisms from SCs to ZHSCs. The advantages/disadvantages of ZHSCs, the recent development of cathode materials, and the new design for device fabrications are critically summarized. New cathode materials should be developed to achieve high energy density while preserving the inherent power capability and stability. People increasingly engage with smart electronic and hybrid gadgets, demanding flexible, resilient, and highly safe energy storage devices. ZHSC has emerged as a complete alternative to risky sodium‐ion/lithium‐ion technologies. An overview of all reported carbon‐based, biomass‐derived carbons, metal oxides, MOFs, COFs, MXenes, graphene, and composite materials employed for ZHSCs is comprehensively provided. Furthermore, cathode materials for flexible, micro, wire‐shaped, printed, and photo‐rechargeable ZHSCs are also examined with their practical challenges. This review is anticipated to offer valuable recommendations for designing and manipulating cathode materials for high‐performance ZHSCs to achieve real‐world applications.

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