The specific capacitance of sol–gel synthesised spinel MnCo2O4 in an alkaline electrolyte
Walsh, Frank C.
Copyright © 2013 Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
In this work, high performance spinel MnCo2O4 electrode was fabricated via a facile sol–gel method and its capacitive behavior was successfully investigated in alkaline electrolyte. MnCo2O4 electrode was characterized by means of powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscope (TEM). The pseudo capacitive behavior of spinel MnCo2O4 was widely investigated in 2 M KOH aqueous electrolyte using cyclic voltammetry (CV), galvanostatic charge-discharge test, and electrochemical impedance spectroscopy (EIS). As a result, the spinel MnCo2O4 exhibited excellent porous structure and the highest specific capacitance of 405 F g−1 was achieved at a current density of 5 mA cm−2. In addition, the spinel MnCo2O4 displayed desirable stability in alkaline electrolyte during long-term cycles with a cycling efficiency of 95.1% over 1,000 cycles. The high specific capacitance and excellent cycling ability of MnCo2O4 show promise for its application in supercapacitors.
National Natural Science Foundation of China
Chinese Ministry of Education
Natural Science Funds for Distinguished Young Scholars of Gansu Province
Program for Hongliu Outstanding Talents in Lanzhou University of Technology
Vol. 115, pp. 22 - 27