The direct growth of Mn 0.6 Ni 0.4 CO 3 nanosheet assemblies on Ni foam for high-performance supercapacitor electrodes

• Published in: New journal of chemistry 2022-02, Vol.46 (6), p.2635-2640
• Main Authors: Cheng, Rongmin, Zhan, Conghong, Gao, Juanjuan
• Format: Article
• Language: English
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/D1NJ01478A

Using Ni foam as a template, Mn 0.6 Ni 0.4 CO 3 nanosheet assemblies were synthesized by a hydrothermal method and calcination treatment. X-Ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), inductively coupled plasma optical emission spectrometry (ICP-OES), X-ray energy spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) were used to determine the composition and the morphology of the sample. The electrochemical performance of the Mn 0.6 Ni 0.4 CO 3 nanosheet assemblies was investigated. The results show that the area-specific capacity of the electrode material in a 2 mol L −1 KOH solution can reach 1.813 F cm −2 at a current density of 10 mA cm −2 . The mass-specific capacity can reach 906.5 F g −1 , and the capacity only decreases by 3.4% after 2000 cycles, indicating that the material has excellent capacity performance. In addition, an asymmetric supercapacitor (ASC) was also assembled by using the Mn 0.6 Ni 0.4 CO 3 nanosheet assemblies and carbon as a cathode and anode, respectively, which delivered an energy density of 23.7 W h kg −1 at the power density of 269.7 W kg −1 . The Mn 0.6 Ni 0.4 CO 3 nanosheet assemblies can be seen as a promising electrode material in the field of supercapacitors.