Binder-free nickel oxalate : A promising material for High-performance electrochemical energy storage in supercapacitors

Energy storage technologies are crucial for addressing the intermittent nature of renewable energy sources. This research work focuses on nickel oxalate as a promising material for electrochemical energy storage applications. The Ni-oxalate sample has been prepared through hydrothermal method on nickel foam. The as prepared Ni-oxalate material has been studied through various characterizations to understand its properties. In terms of energy storage capability, the material exhibited a specific capacitance of 808 F g⁻¹ at 1 A g⁻¹. The electrochemical results demonstrated that the NiC₂O₄ electrode displayed a capacity retention of 81.1 % and a Coulombic efficiency of ∼ 99 %. The synergistic effects of the nickel and carbon in the NiC₂O₄ electrode highlight the potential of this material as an effective active material for supercapacitor applications. The combination of nickel and carbon likely contributes to enhanced electrochemical performance, making it a promising candidate for energy storage in supercapacitors. © 2024 Elsevier B.V.