Bilayered microelectrodes based on electrochemically deposited MnO₂/polypyrrole towards fast charge transport kinetics for micro-supercapacitors

Abstract

Micro-supercapacitors (MSCs) are promising power solution facilities for miniaturized portable electronic devices.

Impact of mesoporous SiO2 support for Ni/polypyrrole nanocomposite particles on their capacitive performance

“…This resistance actually controls the charge transfer kinetics through the electrode/electrolyte interface. 69,[76][77][78] Hence, the larger semicircle diameter indicates poor electrical conductivity. From the comparative Nyquist plots (inset image of Fig.…”

Structural Engineering and Coupling of Two-Dimensional Transition Metal Compounds for Micro-Supercapacitor Electrodes

“…As stated above, the low conductivity and capacity decay of TMOs/TMHs due to the restacking of nanosheets after the long-term cycling process diminish their electrochemical properties. 87 Recently, defect engineering of 2D MnO 2 nanosheets by atomic-level substitutional doping of transition metal cation (Fe 3+ , Co 2+ , and Ni 2+ ) has been proven to introduce new electronic states near the Fermi level, thus improving the natural electrical conductivity and the concentration of redox-active sites. 88 The influence of substitutional doping, in particular, the Fe doping, was observed in a symmetric MSC, which showed the superior electrochemical performance by delivering high energy and power densities.…”

Recent developments in polypyrrole/manganese oxide-based nanocomposites for thin film electrodes in supercapacitors: a minireview

“…To accomplish effective energy storage, there was an urgent need to develop a reliable electrochemical energy storage technology, such as a supercapacitor. [8][9][10][11] Supercapacitors have a higher energy density than conventional capacitors and a higher power density than batteries. Furthermore, supercapacitors offer high reversibility and long life cycles.…”

“…In addition to its high conductivity, Ppy has a strong redox reversibility and environmental stability. 11,29,30 Several Ppy-based products were commercialized including fuel cells, secondary batteries, sensors, supercapacitors, photocatalysts and corrosion prevention compounds. [31][32][33][34][35][36][37][38][39][40] Nano-sized materials with a large surface area and porosity could perform admirably as electrode materials for supercapacitors.…”

“…The formation of metal oxide aggregates during the manufacture of active electrode materials is greatly impeded by the presence of a structured Ppy film. 11 For supercapacitor electrode materials, conducting polymers and metal oxides/hydroxides have emerged as promising electrode materials. 43 MnO 2 demonstrated promising potential as a pseudocapacitor material with a high specific capacitance of ∼1233 F g −1 .…”