In situ grown core/shell heterostructure of CuCo2O4/NiCo-LDH composite intercalated by glucose on Ni networks for all-solid-state hybrid supercapacitor electrodes

• Published in: Journal of energy storage 2023-12, Vol.73, p.108540, Article 108540
• Main Authors: Qu, Xiaoxiao, Jeon, Sangheon, Jeong, Jeonghwa, Kang, Weiwei, Xing, Baolin, Zhang, Chuanxiang, Hong, Suck Won
• Format: Article
• Language: English
• Subjects: Core/shell structure; CuCo2O4; Glucose; Hybrid supercapacitor; NiCo-LDH
• ISSN: 2352-152X; 2352-1538
• DOI: 10.1016/j.est.2023.108540

Hybrid supercapacitors (HSCs) have attracted widespread attention due to their unique combination of high power density and high energy density. Thus, they offer a practical and cost-effective solution for energy storage and power delivery, contributing to the development of a promising technology for various applications. However, the electrochemical performance largely relies on the selection of electrode materials. Here, we suggest composite electrodes of glucose-intercalated CuCo2O4/NiCo-G-layered double hydroxide (LDH) formed with core/shell heterostructures on Ni foam for high-performance HSCs. The strong synergistic effects of the CuCo2O4 core and glucose-intercalated NiCo-G-LDH shell with unique morphology enhance the excellent electrochemical properties by forming a synergistic effect that overcomes the drawbacks of individual materials. The specific capacity of the core/shell structure as a supercapacitor electrode at 1 A g−1 is 378 mAh g−1 and ∼113% is retained after 5000 cycles. In addition, by the integration of the glucose-intercalated CuCo2O4/NiCo-G-LDH with activated carbon, the configured HSC device presents an energy density of ∼37.2 Wh kg−1 at a power density of ∼775.5 W kg−1. Our work offers a robust strategy to create a core/shell composite with excellent stability and durability, making it suitable for use in high-performance energy storage devices. Our approach involves glucose-intercalated CuCo2O4/NiCo-G-layered double hydroxide composite with core/shell heterostructures on Ni foam (NF) as a newly developed supercapacitor electrode, coupled with the activated carbon electrode. As excellent electrodes for high-performance hybrid supercapacitors (HSCs), the potential of our present work highlights a simple combinatorial strategy to organize intriguing composite nanomaterials with controlled morphological features for various applications in energy storage devices. [Display omitted] •The optimal ratio of the CuCo2O4 was selected as the framework through a comparative analysis.•A composite material of CuCo2O4@NiCo-G-LDH with core/shell nanostructures was synthesized.•The glucose-intercalated NiCo-G-LDH presents the expanded interlayer spacing.•The composite electrode demonstrates a high specific capacitance and superior rate capability.•The assembled device exhibits the high energy density and cycling stability.