High mass-loading NiCo-LDH nanosheet arrays grown on carbon cloth by electrodeposition for excellent electrochemical energy storage. (August 2021)

• Record Type: Journal Article
• Authors: Han, Xiangyu; Li, Jien; Lu, Junlin; Luo, Shuang; Wan, Jing; Li, Bangxing; Hu, Chenguo; Cheng, Xinlu
• Is Part Of: Nano energy. Volume 86(2021)
• Publication Date: 2021-08
• Subjects: Nickel -- Cobalt -- Layered double hydroxides -- Electrodeposition -- Supercapacitor; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2021.106079
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: NiCo layered double hydroxides (LDHs) have attracted extensive attention in supercapacitors nowadays due to their ion insertable layer structure, however, improvement of their electrochemical energy storage performance is still a great challenge work. Herein, three-dimensional NiCo(NA)-LDH nanosheet networks with high mass-loading on an activated carbon cloth are prepared by electrodeposition using a mixed Ni/Co nitrate and acetate as reactants, which is denoted as NiCo(NA)-LDH. When the mass-loading is 16 mg cm −2 and the current density is 10 mA cm −2, the areal capacitance of NiCo(NA)-LDH@ACC electrode reaches 27.3 F cm −2 and the specific capacitance is 1709 F g −1 at 0.62 A g −1, and the mass-loading is positively correlated with the capacitance performance. An asymmetric supercapacitor assembled by NiCo(NA)-LDH@ACC as the positive electrode and acid-etched carbon cloth as the negative electrode achieves a working potential window of 1.7 V and energy density of 2.24 mW h cm −2 at a power density of 3.71 mW cm −2, which are much higher than the previous reports of NiCo-LDH based supercapacitors. In addition, the prepared device shows an excellent cycle stability with 104% capacity retention after 10, 000 cycles at 250 mA cm −2 . Graphical Abstract: NiCo(NA)-LDH@ACC with supermassive load has ultrahigh areal capacitance and excellent cycle stability. The assembled asymmetric supercapacitor exhibits excellent energy storage capabilities. ga1 Highlights: NiCo(NA)-LDH@ACC with supermassive load is synthesized by electrodeposition method. By choosing Ni/Co nitrate and acetate as reactants, the morphology of the prepared NiCo(NA)-LDH@ACC can be improved. NiCo(NA)-LDH@ACC electrode has ultrahigh areal capacitance and excellent cycle stability. The assembled asymmetric supercapacitor exhibits excellent energy storage capabilities.