Fabrication of high-performance asymmetric supercapacitors based on metal-organic framework-derived bi-metallic telluride / reduced graphene oxide composites

Demand for more efficient energy storage devices has led to the research regarding the development of novel compounds with promising properties. In this regard, metal-organic frameworks (MOFs) derived metal chalcogenides represent an emerging class of active materials with the potential to address key challenges in supercapacitor technology. For the first time, in this study, we developed a novel electrode materials Ni-Zn-Te/rGO derived from MOF on nickel foam (NF). The Ni-Zn-Te/rGO/NF electrode demonstrated a high specific capacity of 265 mA h g⁻¹ (1664 F g⁻¹) at a current density of 2A g⁻¹. Remarkably, it retained 94 % of its initial capacity after 7000 charge-discharge cycles, indicating its excellent cycling stability. The electrode was further utilized in an asymmetric supercapacitor (ASC) configuration with activated carbon as the negative electrode in an aqueous electrolyte. The assembled ASC showed a potential window, specific capacity, and energy density of 1.7 V, 98 mA h g⁻¹ (194 F g⁻¹), and 77.9 W h kg⁻¹, respectively, at power and current density of 1442 W kg⁻¹ and 2 A g⁻¹, respectively. Additionally, the device retained 90 % of its initial capacity after 7000 cycles, demonstrating outstanding long-term stability. This research provides a promising strategy for the design and development of efficient and durable electrodes for high-performance asymmetric supercapacitors.