Elevated asymmetric supercapacitor with the nickel-metal organic framework derived nickel oxide/nickel composite: Designed to optimize efficiency and reliability

• Published in: Electrochimica acta Vol. 507; p. 145134
• Main Authors: Raje, Pradnya G., Waikar, Maqsood R., Kulkarni, Sourabh S., Gurav, Sunny R., Shembade, Umesh V., Bagwan, Azeem M., Ghongade, Satyashila D., Sonkawade, Aniket R., Moholkar, Annasaheb V., Dongale, Tukaram D., Sonkawade, Rajendra G.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 10-12-2024
• Subjects: Asymmetric energy storage device; MOF derived NiO/Ni composite; Ni-MOFs; Solvothermal method; Supercapacitor; Ni-MOFs; Supercapacitor; MOF derived NiO/Ni composite; Asymmetric energy storage device; Solvothermal method
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2024.145134

•The spherical structured Ni-MOF-derived NiO/Ni-450 composite exhibits an optimal particle size of 156 nm, smaller than NiO/Ni-550 (170 nm) and NiO/Ni-650 (172 nm).•The NiO/Ni-450 and H5 electrodes demonstrate improved Cs values of 410 Fg-1 and 371 Fg-1, respectively, at 5 mVs-1.•An asymmetric shows 80 % capacitance retention rate after 9000 cycles.
In this study, a solvothermal method is used to synthesizes MOF-derived NiO/Ni composites and NiO samples at various calcination temperatures (350 °C, 450 °C, 550 °C, and 650 °C) and durations (4, 5, 6, and 7 h). The NiO/Ni sample calcined at 450 °C for 5 h (NiO/Ni-450) exhibits the highest specific capacitance (Cs) of 410 Fg⁻¹ at a scan rate of 5 mV s⁻¹. This superior performance results from the combined benefits of Ni's metallic conductivity and NiO's redox activity. In a 1 M KOH electrolyte, NiO/Ni-450 retains about 83 % of its initial capacitance after 2,000 cycles. The NiO sample formed by calcining NiO/Ni-450 for 5 h (H5) achieves a specific capacitance (Cs) of 371 Fg⁻¹ and retains 80 % of its capacitance after 2,000 cycles. NiO/Ni-450 and H5 demonstrate energy densities (Ed) of 8.58 and 5.48 Wh kg⁻¹, and power densities (Pd) of 608 and 500 W kg⁻¹, respectively. An asymmetric supercapacitor using NiO/Ni-450 and activated carbon (AC) shows an impressive 80 % capacitance retention after 9,000 cycles, with a Cs of 123 Fg⁻¹, and Ed and Pd values of 14.58 Wh kg⁻¹ and 4038 W kg⁻¹, respectively, highlighting the potential for industrial-scale production of these materials for energy storage.