A zipper-like NiCo2O4/Ni(OH)2 growing on multifunctional nickel foam with excellent capacitive performance

• Published in: Journal of alloys and compounds 2019-05, Vol.784, p.712-719
• Main Authors: Teng, Ying, Huo, Yu-qiu, Li, Shu-ting, Niu, Xiao-ming, Fan, Na, Su, Zhong-min
• Format: Article
• Language: English
• Subjects: Composite; Electrode materials; Energy storage; Metal foams; Nickel compounds; NiCo2O4/Ni(OH)2; Substrates; Supercapacitor; Supercapacitors; Zipper-like
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2018.12.351

The increased needs for sustainable energy storage devices make it urgent to develop novel supercapacitor electrode materials. An ingenious zipper-like NiCo2O4/Ni(OH)2 composite has been successfully grown on nickel foam via a one-pot hydrothermal method free of any template or catalyst. Owing to its close contact with the substrate, its distinguished zipper-like structure and unique ingredients, the specific capacitance of NiCo2O4/Ni(OH)2 was as high as 2721 mF cm−2 at 1 mA cm−2; 2161 mF cm−2 was obtained even at 50 mA cm−2; and it retained 86% capacity after 10000 cycles. The facile synthesis method and remarkable capacitive performance of the zipper-like NiCo2O4/Ni(OH)2 make it attractive for supercapacitor applications. [Display omitted] •The unique zipper-like NiCo2O4/Ni(OH)2 composite material is obtained for the first time.•It exhibits high specific capacitance of 2721 mF cm−2 (2474 F g-1) at 1  mA cm−2.•It maintains 86% of its original specific capacitance after 10000 cycles.•The energy density is up to 33.91 Wh kg−1 for the NiCo2O4/Ni(OH)2//C capacitor.