A flexible supercapacitor based on bamboo shoot-like NiCo2Se4 hollow nanostructure

• Published in: Ionics Vol. 29; no. 8; pp. 3353 - 3363
• Main Authors: Yang, Rui, Zhang, Yu, Huang, Xian, Yin, Huiqun, Mo, Yiyan, Zhang, Kaiyou, Qin, Aimiao, Chen, Shuoping, Dai, Shuge
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.08.2023; Springer Nature B.V
• Subjects: Bamboo; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Electrochemical analysis; Electrochemistry; Electrode materials; Energy Storage; Ion transport; Kirkendall effect; Morphology; Optical and Electronic Materials; Renewable and Green Energy; Supercapacitors; Transport rate; Hollow structure; Supercapacitor; Kirkendall effect; NiCo; Se
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-023-05061-4

The electrochemical performance of the electrode material for supercapacitor is influenced by several factors and could be facilitated by a particular morphology. A reasonable morphology can provide more active sites and larger specific surface area, and increase the ion transport rate. Herein, NiCo 2 Se 4 with hollow nanobamboo shoot (NBS) structure is prepared by a two-step hydrothermal process and the formation of hollow structure is due to the Kirkendall effect. The NiCo 2 Se 4 synthesized with optimal conditions achieves a high specific capacitance of 6.21 F cm −2 at a current density of 1 mA cm −2 , and the cycling stability of NiCo 2 Se 4 is as high as 76% after 5000 cycles at 20 mA cm −2 . The designed NiCo 2 Se 4 //AC supercapacitor can achieve an energy density of 24.9 Wh kg −1 at a power density of 537.04 W kg −1 . All of the above demonstrate that NiCo 2 Se 4 bamboo shoot-like structure has a promising application in supercapacitor.