Facile synthesis of the 3D interconnecting petal-like NiCoO2/C composite as high-performance supercapacitor electrode materials. (August 2019)

• Record Type: Journal Article
• Authors: Lin, J.H.; Chen, H.; Shuai, M.M.; Wu, W.Z.; Wang, Y.; Zhang, W.G.; Ling, Q.D.
• Is Part Of: Materials today nano. Volume 7(2019)
• Publication Date: 2019-08
• Subjects: NiCoO2/C composite -- Layered double hydroxide (LDH) -- Confinement space -- Graphitization -- Supercapacitor -- Petal-like architecture; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Nanoscience; Nanotechnology -- Periodicals; Periodicals; Periodical; Electronic journals; Electronic journals; 620.5
• DOI: 10.1016/j.mtnano.2019.100046
• Languages: English
• ISSNs: 2588-8420

Abstract

Abstract: In the present work, a novel NiCoO2 nanoparticle/amorphous carbon composite was synthesized through an intercalation-calcination process under very mild reaction conditions (400 °C, without high vacuum). The NiCoO2 /C composite possesses a unique 3D interconnecting petal-like architecture, together with appropriate compositing of NiCoO2 nanoparticles. The distinctive nanostructure endows a high specific capacitance of 190.4 mAh g −1 (equivalent conversion to 1713.7 F g −1 ) at the current density of 1 A g −1 (133.3 mAh g −1 at 20 A g −1 ) in a three-electrode system, using 3.0 M KOH as an aqueous electrolyte. And the remarkable cycling stability at a high current density of 10 A g −1 (∼2% loss over 3000 charge-discharge cycles) has also been demonstrated. Moreover, the fabricated asymmetric supercapacitor using the NiCoO2 /C composite as the positive electrode material and activated carbon as the negative electrode material can deliver a relatively high energy density of 36.1 Wh kg −1 and a power density of 8000 W kg −1 under a high potential window of 0–1.6 V. The facile lattice orientation/confinement strategy described here is simple, of low cost, and eco-friendly, which makes the NiCoO2 /C composite a promising electrode material for supercapacitors. Graphical abstract: Image 1 Highlights: The NiCoO2 /C composite with 3D interconnecting petal-like architecture is prepared through an intercalation-calcination process under very mild reaction conditions. An ultrahigh specific capacitance of 1713.7 F g −1 at a current density of 1 A/g −1 is achieved. The assembled asymmetric supercapacitor shows a relatively high energy density of 36.1 Wh kg -1 and a power density of 8000 W kg -1 under a high potential window of 0–1.6 V. The distinctive nanostructure and synergetic effect contribute remarkable cycling stability (98% capacity retention) and excellent pseudocapacitive performance.