Composites of NiMoO4@Ni-Co LDH@NiCo2O4 on Ni foam with a rational microscopic morphology for high-performance asymmetric supercapacitors

• Published in: Journal of alloys and compounds 2022-05, Vol.902, p.163749, Article 163749
• Main Authors: Hu, Cunhai, Gong, Jiaxu, Wang, Jiaheng, Zhou, Tianlong, Xie, Mingzhen, Wang, Shuai, Dai, Yatang
• Format: Article
• Language: English
• Subjects: Activated carbon; Asymmetry; Composite materials; Core-shell structure; Energy storage; Flux density; Metal foams; Molybdates; Nanorods; Ni-Co LDH; Nickel compounds; NiCo2O4; NiMoO4; Shells; Specific capacity; Structural stability; Supercapacitor; Supercapacitors
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2022.163749

•NiMoO4@Ni-Co LDH@NiCo2O4 with core-shell structure was successfully designed.•Discuss the influence of electrodeposition time on electrochemical performance.•Asymmetric supercapacitors exhibit a high voltage window of 1.8 V.•NiMoO4@Ni-Co LDH@NiCo2O4 shows a high energy density in asymmetric supercapacitor. [Display omitted] The structural stability and high capacity of material enable a wide range of applications for asymmetric supercapacitors. In this work, we design a simple route to synthesize NiMoO4@Ni-Co LDH@NiCo2O4 composites on Ni foam. The NiMoO4@Ni-Co LDH@NiCo2O4 has a stable nanorod/nanosheet core-shell structure. In addition, the NiMoO4@Ni-Co LDH150@NiCo2O4 exhibits a high specific capacity of 1035 C g−1 and retained 80.6% of the original capacity after 5000 cycles. Moreover, the asymmetric supercapacitor is assembled by activated carbon and NiMoO4@Ni-Co LDH150@NiCo2O4 as two electrodes respectively, which shows a high energy density of 66.8 Wh kg−1 at a power density of 900 W kg−1. In the meantime, the asymmetric supercapacitor achieved a high voltage window of 1.8 V. The stable core-shell structure of NiMoO4@Ni-Co LDH@NiCo2O4 achieved a high energy density, which shows great potential for energy storage.