Construction of a nanostructured NiCo2S4/Ni/Ni9S8 composite for energy storage applications

• Published in: Solid state sciences 2024-05, Vol.151, p.107501, Article 107501
• Main Authors: Mostafa, Reham Ehab, Mahmoud, S.S., Tantawy, N.S., Mohamed, Saad G.
• Format: Article
• Language: English
• Subjects: Asymmetric device; Battery-type materials; Nanostructured materials; NiCo2S4/Ni/Ni9S8 composites; Supercapacitor
• ISSN: 1293-2558; 1873-3085
• DOI: 10.1016/j.solidstatesciences.2024.107501

It is necessary to investigate and develop nickel-cobalt sulfide electrodes with superior electrochemical behavior. This work produced the NiCo2S4/Ni/Ni9S8 nanostructure composite (NCS/N/NS) for energy storage in supercapacitors using a solvothermal technique with polyethyleneimine (PEI) as a carbon source, followed by an hour of annealing in an argon atmosphere, and a hydrothermal method with thiourea as a sulfur and nitrogen source. Outstanding electrochemical energy storage properties are provided by NCS/N/NS. The produced electrode material, NCS/N/NS, demonstrated an exceptional capacitance of 1620 F g−1 (696 C g−1) at 1 A g−1 when employed for SCs. An NCS/N/NS was used as the positively charged electrode and the opposite electrode of commercial AC to build an NCS/N/NS//activated carbon (AC) asymmetric device for practical usage. At 1 A g−1, the asymmetric device produced a specific power of 887 W kg−1 and a unique specific energy of 53 Wh kg−1. Moreover, it exhibits a 100% coulombic efficacy and a 95% capacity retention after 3000 cycles, respectively. [Display omitted] •NiCo2S4/Ni/Ni9S8 novel nanocomposite was prepared using a solvothermal method.•The nanocoposite electrode revealed a superb capacitance of 1620 F g−1 (696 C g−1) at 1 A g−1.•The asymmetric device achieved a unique specific energy of 53 Wh kg−1, with a specific power of 887 W kg−1 at 1 A g−1.