Synthesis and control of high-performance MnO2/carbon nanotubes nanocomposites for supercapacitors

Carbon-coated manganese dioxide nanoparticles and their enhanced electrochemical properties for zinc-ion battery applications

“…In our previous report, α-MnO 2 8 nanorods were investigated as zinc-ion battery (ZIB) cathodes. 9 This electrode showed a first discharge capacity of 233 mAh/g 10 at 83 mA/g current density [2] . However, capacity fading under 11 prolonged cycles, which has also been reported by many other 12 groups, is a major drawback of this electrode [3,4] .…”

“…16 Naturally abundant, low-cost, and environmentally benign 17 highly conducting materials, such as carbon can be used to over- 18 come the aforementioned limitation of MnO 2 . Carbon-coated elec- 19 trode materials such as transition metal oxides have been widely 20 studied to obtain high performance electrodes [6][7][8][9] . Hashem et al 21 prepared carbon-coated rod-shaped MnO 2 in order to achieve an 22 electrode material with enhanced electrochemical performance for 23 lithium-ion battery (LIB) application [10] .…”

Synthesis and characterisation of amorphous MnO 2 /CNT via solid‐state microwave for high‐performance supercapacitors

“…Impedance spectrum was measured on the grounds of the equivalent circuit shown in Figure D to determine the resistance and capacitance of the electrode. In Figure D, CPE1 originated from the interface double‐layer charging, and Warburg impedance (Zw) was connected to cation diffusion in the electrode . The fitting results showed that the values of Rs and Rct were 0.77 and 0.05 Ω, respectively.…”

“…Furthermore, the Rs and Rct of amorphous MnO 2 /CNT nanocomposites were smaller than those of pure CNT. The rapid charge transfer rate of MnO 2 /CNT electrode is attributed to the electronic structure of CNT, which plays a crucial role in improving the energy storage capacity . On the basis of EIS data, the relational graph of phase and frequency is plotted in Figure E.…”

“…In Figure 5D, CPE1 originated from the interface double-layer charging, and Warburg impedance (Zw) was connected to cation diffusion in the electrode. 51 The fitting results showed that the values of Rs and Rct were 0.77 and 0.05 Ω, respectively. Furthermore, the Rs and Rct of amorphous MnO 2 /CNT nanocomposites were smaller than those of pure CNT.…”