Abstract
The convenient synthesis of the composite electrode with high supercapacitance performance plays an important role in practical application but is challenging. Herein, the carbon nanotubes (CNTs) coupled with low-crystalline sulfur and nitrogen co-doped NiCo-LDH (denoted as SN-NiCo-LDH) nanosheets array are grown on NiCo foam (NCF) substrate by two convenient steps of metal induced self-assembly and corrosion engineering, which present the advantages of operating at room-temperature and low preparation costs. Benefiting from the S–N co-doping and low-crystallinity of NiCo-LDH, the prepared SN-NiCo-LDH@CNTs@NCF electrode presents a topping charge capacity of 2470 C·g−1 (4.94 C·cm−2) at 5 mA·cm−2. Furthermore, the fabricated asymmetry supercapacitor (ASC) achieves an extraordinary energy density of 77 Wh·kg−1 (0.617 mWh·cm−2) at a power density of 438 W·kg−1 (3.5 mW·cm−2) and outstanding stability (91% capacity retention after 5000 cycles at 20 mA·cm−2). Impressively, the structure evolution of NiCo-LDH during the charge/discharge processes has been thoroughly elucidated by in-situ Raman spectra. Therefore, this work verifies a powerful strategy and practical value for preparing composite electrodes with high supercapacitance performance, and also provides guidance for the rational design of the smart electrodes. Graphical Abstract: (Figure presented.)
Original language | English |
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Journal | Rare Metals |
DOIs | |
Publication status | Accepted/In press - 2024 |
Keywords
- Carbon nanotubes
- Convenient synthesis
- NiCo-LDH
- Sulfur and nitrogen co-doped
- Supercapacitor
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Metals and Alloys
- Materials Chemistry