Synthesis and Characterization of Nickel-doped Manganese Dioxide Electrode Materials for Supercapacitors

Abstract

Nickel-doped manganese dioxide (Ni-MnO2) synthesized by sol-gel method has been used as an electrode material for supercapacitors. The structure and electrochemical properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectrometry (EIS). Results showed that the nickel-doped manganese dioxide sample exhibited irregular particles with the diameter of about 500 nm. The crystallographic structure of MnO2 was the poorly crystallized γ-MnO2. The doping ratio had a great influence on the electrochemical properties of the materials. When the molar ratio of Ni/Mn was 3/100, the specific capacitance of Ni-MnO2 achieved to 252.61 F/g. After 2000 charge/discharge cycles, the specific capacitance of Ni-MnO2 was still maintained at 74.36%, which was attributed to its excellent cycling stability.

Cu‐ and Fe‐Incorporated Manganese Oxides (MnxOy) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

“…Although the MnO 2 pattern did not change, the addition of Cu caused a decrease in the MnO 2 peak intensity. When doping some transition metals (including Cu) into MnO 2 , Cu ions could enter the MnO 2 lattice and cause distortion of the MnO 2 lattice; this corresponded to the results of previous studies [24,44–48] …”

Green Plasma Enhanced Synthesis of Multi-Phase NiMnO3 Cathode for Aqueous Zn-Ion Batteries

“…The reported nickel-doped Mn oxide 13,38 lead to a higher capacity of a Zn-ion battery than is achieved in this work meaning that more research is needed to unlock the potential presented by our NiMnO 3 electrode. Nevertheless, the cycle retention of our NiMnO 3 electrode compares well with other reported electrodes such as Ni-(γ)MnO 2 which exhibited a specific capacitance of 236 F g −1 and 74.36% retention after 2,000 cycles 39 and Ni(OH) 2 -MnO 2 which exhibited a specific capacitance of 1928 F g −1 and 85% retention after 5,000 cycles. 40 Furthermore, the charge storage retention of our electrode compares well with many reported cathodes for Zn-ion batteries such as ZnNiMnCo 2 O 4 spinel which exhibited 60% capacity retention after 200 cycles 41 and Ni-doped ZnMn 2 O 4 /Mn 2 O 3 which exhibited 91.32% after 3,000 cycles.…”

A Review of Supercapacitors: Materials Design, Modification, and Applications

“…Zhang Yong et al [116] reported the preparation of NiCo 2 O 4 with a diameter in the range of 20-30 nm through the sol-gel method using the Ni(NO 3 ) 2 [116], (Ni-MnO 2 ) [130], NiO-CeO 2 [131], Co 3 O 4 [132], MnO 2 [133], mixed ternary transition metal ferrite (MTTMF) [134] etc., were also prepared using the sol-gel method. Figure 6 indicates the sol-gel process for the synthesis of supercapacitor electrode materials.…”