Performance evaluation of CNT/polypyrrole/MnO2 composite electrodes for electrochemical capacitors

Carbon Nanotubes and Carbon Nanotubes/Metal Oxide Heterostructures: Synthesis, Characterization and Electrochemical Property

“…This was confirmed by Nam et al, who observed increasing capacitances with decreasing NiO content and thus coating thickness [233]. A promising approach to enhance the capacitive performance has recently been reported by Sivakkumar et al, who synthesized a ternary hybrid of CNT/polypyrrole/hydrous MnO 2 , which showed a significantly higher specific capacitance (280 F/g) compared to the binary CNT/MnO 2 (150F/g) [141]. The increase in capacitance is believed to be due to the better dispersion of hydrous MnO 2 in the composite electrode.…”

“…As an example, Sivvakkumar et al deposited MnO 2 via chemical reduction of KMnO 4 [141]. The authors suspended the CNTs in Na-p-toluene sulfonate and pyrrole, which polymerized with the aid of ultrasonication.…”

Design and Synthesis of Hierarchical MnO2 Nanospheres/Carbon Nanotubes/Conducting Polymer Ternary Composite for High Performance Electrochemical Electrodes

“…However, conducting polymers and metal-oxides both suffer from mechanical instability. 23 Electrodes made of hydrous MnO 2 with conducting polymers showed mechanical instability and poor cycleability. For composites with carbonaceous materials, including CNTs, the reported enhancement of electrochemical performance is more pronounced when only a small amount of metal oxide is incorporated in the electrode.…”

“…1,[20][21][22] However, a key weakness of the metal oxide material is its limited electric conductivity. 23 To effectively utilize MnO 2 materials, binary composites of hydrous MnO 2 with either carbon nanotubes (CNTs) [24][25][26][27][28][29] or conducting polymers [30][31][32] have been explored and demonstrated improvement in the electrochemical performance. However, conducting polymers and metal-oxides both suffer from mechanical instability.…”

Synthesis and Electrochemical Characterization of Polypyrrole/Multi-walled Carbon Nanotube Composite Electrodes for Supercapacitor Applications

“…In order to improve the mechanical and electrochemical properties of electrodes based on conducting polymers, the composites of conducting polymers and CNTs have been synthesized for supercapacitor applications. [15][16][17][18][19][20][21][22] It has been shown that CNTs play a role of a perfect backbone for a homogeneous distribution of conducting polymer in the composites. Recently, Kim et al reported that high-specific capacitance and good high-rate capability of polypyrrole(PPy)/CNT composite electrodes could be achieved by controlling pore size in a three-dimensional entangled structure of a CNT film.…”