Synthesis and characterization of reduced graphene oxide decorated with CeO2-doped MnO2nanorods for supercapacitor applications.
A novel and efficient CeO2-doped MnO2nanorods decorated reduced graphene oxide (CeO2-MnO2/RGO) nanocomposite was successfully synthesized via hydrothermal method. The growth of the CeO2doped MnO2nanorods over GO sheets and reduction of GO were simultaneously carried out under hydrothermal treatment. The morphology and structure of as-synthesized nanocomposite were characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman spectroscopy, which revealed the formation of CeO2-MnO2decorated RGO nanocomposites. The electrochemical performance of as-prepared CeO2-MnO2/RGO nanocomposites as an active electrode material for supercapacitor was evaluated by cyclic voltammetry, charge-discharge, and electrochemical impedance spectroscopy (EIS) methods in 2M alkaline medium. The obtained results revealed that as-synthesized CeO2-MnO2/RGO nanocomposite exhibited higher specific capacitance (648F/g) as compared to other formulations (MnO2/RGO nanocomposites: 315.13 F/g and MnO2nanorods: 228.5 F/g) at the scan rate of 5mV/s. After 1000 cycles, it retained ∼90.4%, exhibiting a good stability. The high surface area, enhanced electrical conductivity, and good stability possess by the nanocomposite make this material a promising candidate to be applied as a supercapacitor electrode.
Department of BIN Convergence Technology, Chonbuk National University, Jeonju 561-756, Republic of Korea.
Gunendra Prasad
GP
Ojha
Department of Chemistry, Inha University, 100 Inharo, Incheon 402-751, Republic of Korea.
Bishweshwar
B
Pant
Department of Chemistry, Inha University, 100 Inharo, Incheon 402-751, Republic of Korea.
Soo-Jin
SJ
Park
Department of Organic Materials and Fiber Engineering, Chonbuk National University, Jeonju 561-756, Republic of Korea. Electronic address: wonderfulmira@jbnu.ac.kr.
Mira
M
Park
Department of BIN Convergence Technology, Chonbuk National University, Jeonju 561-756, Republic of Korea; Department of Organic Materials and Fiber Engineering, Chonbuk National University, Jeonju 561-756, Republic of Korea. Electronic address: khy@jbnu.ac.kr.
Hak-Yong
HY
Kim
CeO(2)-MnO(2)/RGO; Hydrothermal; Nanocomposite; Supercapacitor