Nickel-cobalt layered double hydroxide nanosheets anchored to the inner wall of wood carbon tracheids by nitrogen-doped atoms for high-performance supercapacitors

• Published in: Journal of colloid and interface science 2022-02, Vol.608, p.70-78
• Main Authors: Li, Zuwei, Wang, Xiaoman, Wang, Ziheng, Wang, Luchi, Guo, Yuhang, Zhou, Cui, Li, Xianjun, Du, Kun, Luo, Yongfeng
• Format: Article
• Language: English
• Subjects: Nickel–cobalt layered double hydroxide; Nitrogen-doped carbon materials; Supercapacitor; Wood-derived monolithic carbon
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2021.09.127

[Display omitted] In this paper, a novel type of electrode material for high-performance hybrid supercapacitors is designed. The electrode mainly uses nitrogen-doped atoms to anchor the nickel–cobalt layered double hydroxide on the inner wall of wood-derived carbon tracheids from Chinese fir wood scraps. The specific capacity of the composite single electrode is 14.26 mAh cm−2 at 10 mA cm−2. The hybrid supercapacitor with a composite electrode cathode and nitrogen-doped wood-derived monolithic carbon materials as the anode has a high specific capacitance of 4.74F cm−2 at 5 mA cm−2, and the capacitance retention rate is 93.15% after 8000 charge–discharge cycles. The highest energy density and power density reach 1.48 mWh cm−2 and 22.40 mW cm−2, respectively. After doping with nitrogen, the combination with the nickel–cobalt layered double hydroxide is more uniform and stable, and the capacitance and cycling stability are significantly improved.