Hierarchical spinel NiMn2O4 nanostructures anchored on 3-D nickel foam as stable and high-performance supercapacitor electrode material

• Published in: Journal of energy storage 2023-11, Vol.71, p.108168, Article 108168
• Main Authors: Dhas, Suprimkumar D., Thonge, Pragati N., Waghmare, Shivaji D., Kulkarni, Gopal K., Shinde, Surendra K., Kim, Dae-Young, Patil, Teja M., A. Yewale, Manesh, Moholkar, Annasaheb V., Kim, Daewon
• Format: Article
• Language: English
• Subjects: Energy storage; Hydrothermal; NiMn2O4-Ni foam electrode; Symmetric supercapacitors device
• ISSN: 2352-152X; 2352-1538
• DOI: 10.1016/j.est.2023.108168

A simple hydrothermal route has been used to synthesize NiMn2O4 nanostructures (NSs) on nickel foam. The electrochemical investigation shows how annealing temperature affects its supercapacitive properties. The NMO@500-Ni-foam electrode shows a high specific capacitance of 930 Fg−1 at a constant scan rate of 5 mVs−1 in 1 M KOH electrolyte. Additionally, the corresponding symmetric supercapacitor device (SSCs) has a superior cyclic span with 93.7 % capacitance retention even after 5000 cycles, excellent electrochemical performance with a specific capacitance of 72.9 Fg−1, specific energy of 11 Whkg−1, and specific power of 857 Wkg−1. The exceptional results suggest that NiMn2O4 grown on Ni-foam might be a promising candidate for electrochemical energy storage applications. The hydrothermally synthesized NMO@500-NF shows high specific capacitance of 930 Fg−1 at 5 mVs−1. As a fabricated symmetric supercapacitor device, it exhibits excellent specific energy and specific power of 11 Whkg−1 and 857 Wkg−1, respectively, with 93.7 % of capacitance retention over 5000 cycles. [Display omitted] •The hydrothermal method with further calcination was adopted to fabricate binary nickel manganese oxide nanostructures.•NMO@500-NF shows a high specific capacitance of 930 Fg-1 with stability of 8.8 % loss over 10000 cycles.•The SSCs device shows a good specific capacitance of 72 Fg-1 and delivers a maximum specific energy of 11 Whkg−1 with a specific power of 857 Wkg−1.•The SSCs device reveals excellent long term cyclic stability of 93.7 % after 5000 cycles.