Anchoring ternary NiCoMn-S ultrathin nanosheets on porous ZnCo2O4 nanowires to form core-shell composites for high-performance asymmetric supercapacitor

• Published in: Journal of alloys and compounds Vol. 870; p. 159347
• Main Authors: Wang, Hongbo, Cai, Wangfeng, He, Leqiu, Zhu, Manlin, Wang, Yan
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 25.07.2021; Elsevier BV
• Subjects: Activated carbon; Composite materials; Core-shell; Electrochemical analysis; Electrodeposition; Energy storage; Flux density; HSC device; Manganese; Metal foams; Nanosheets; Nanowires; Ni-Co-Mn sulfide; Nickel; Structural hierarchy; Supercapacitors; ZnCo2O4; Electrodeposition; Ni-Co-Mn sulfide; Core-shell; ZnCo2O4; HSC device
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2021.159347

•ZnCo2O4@NiCoMnS-4 with porous core and ultrathin shell structure is prepared via a simple method.•The electrode exhibits high area capacity of 7.04 C·cm−2 under 2 mA·cm−2(1671 C·g−1 at 1.1 A·g−1).•Ni plays an important role in the formation of the core-shell structure.•The ultrathin shell is formed by changing the deposition time and nickel and manganese content in the deposition process.•Assembled ZnCo2O4@N1C2M1S-4//AC device reveals an excellent energy density of 64.36 Wh·kg−1. Successful synthesis of novel multi-component metal composites with a unique structure can effectively promote the electrochemical performance improvement of supercapacitors. Herein, three-dimensional (3D) ZnCo2O4@NiCoMn-S(denoted as ZnCo2O4@NxCyMzS-X, x, y and z refer to the element content ratio, X refers to the number of cycles) arrays growing on nickel foam (NF) were synthesized with facile hydrothermal and electrodeposition processes. The structure of samples is regulated with the molar content of Ni/Mn ions and deposition time in electrodeposition. ZnCo2O4@N1C2M1S-4 with optimal hierarchical structure shows a high area capacity of 7.04 C·cm−2 under 2 mA·cm−2 (1671 C·g−1 at 1.1 A·g−1) and cycle retention rate of 76.48% after 3000 cycles under 50 mA·cm−2. Furthermore, a ZnCo2O4@N1C2M1S-4//Active Carbon (AC) hybrid supercapacitor (HSC) was assembled to test the practical application of ZnCo2O4@N1C2M1S. It is shown the voltage window of HSC achieves as high as 1.9 V, and it reveals a high energy density of 64.36 Wh·kg−1 under a power density of 0.95 kW·kg−1 along with great stability with 75% retention at 5 A·g−1 after 5000 cycles, showing a broad prospect in the field of energy storage. At the time, this study provides a reference for material structure design.