Hierarchical CuCo2O4 nanobelts as a supercapacitor electrode with high areal and specific capacitance. (10th November 2015)

• Record Type: Journal Article
• Authors: Vijayakumar, Subbukalai; Lee, Seong-Hun; Ryu, Kwang-Sun
• Is Part Of: Electrochimica acta. Volume 182(2015)
• Page Start: 979
• Page End: 986
• Publication Date: 2015-11-10
• Subjects: Copper cobaltite -- nanobelts -- supercapacitor -- specific capacitance; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.10.021
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: First time we report the synthesis of CuCo2 O4 nanobelts using hydrothermal method. The spinel CuCo2 O4 nanobelts exhibit maximum areal capacitance of 2.42 F cm −2 . After 1800 cycles, 127% of the initial specific capacitance was retained. Abstract: One dimensional hierarchical CuCo2 O4 nanobelt like architecture was synthesized via hydrothermal method. The synthesized nanomaterial was characterized using X-ray diffraction (XRD) analysis, field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). The TEM image clearly shows the nanobelt like architecture of CuCo2 O4 . The supercapacitor properties of CuCo2 O4 nanobelts electrode were tested using cyclic voltammetry, charge-discharge and electrochemical impedance spectroscopy. The spinel CuCo2 O4 nanobelts exhibit maximum areal and specific capacitance of 2.42 F cm −2 (809 F g −1 ). After 1800 continuous charge-discharge cycles, 127% of the initial capacitance was retained. This superior electrochemical supercapacitor property is mainly due to increased surface area and ion transport of nanobelt like architecture. The charge transfer resistance (Rct ) value of CuCo2 O4 nanobelt electrode is 3.85 Ω. This high capacitance and cyclic stability demonstrate that the prepared CuCo2 O4 nanobelts are a promising candidate for supercapacitors.