Hierarchical Co3O4@PPy@MnO2 core–shell–shell nanowire arrays for enhanced electrochemical energy storage

Materials and fabrication of electrode scaffolds for deposition of MnO2 and their true performance in supercapacitors

“…Besides enhancing the electrical conductivity of the electrodes and providing pseudocapacitance, the intermediate conductive polymer shell could also act as sacrificing material for conformal in-situ deposition of MnO 2 [78,82,110,127], while the conductive polymer outer layer could protect the MnO 2 active phase from dissolution in acidic gel electrolyte [79,169]. Thanks to its excellent electrical conductivity, chemical stability and good mechanical flexibility, PEDOT has also been directly employed as a scaffold material [67e69, 190,191].…”

“…Recently, in-situ redox deposition of MnO 2 was further extended to metal oxides nanostructures by reaction between MnO À 4 and a pre-painted carbon coating on the metal oxides surface [63,106,107,117,248]. In-situ redox deposition could also be realized by redox reactions between MnO À 4 and conducting polymer nanostructures [68], so this could be further extended to conducting polymer coated carbon [78,82] and metal oxides [110,127] scaffolds.…”

Electrochemical and viscoelastic evolution of dodecyl sulfate-doped polypyrrole films during electrochemical cycling

“…Up to date, significant attention has been drawn to enhance the ionic transfer/transport and cycling stability of CPEs to devise electronics with effective energy storage capability [7][8][9][10], thereby demanding a thorough understanding of the ion transfer behavior at the CPEs/electrolyte interface. Another issue is that the CPEs experience inevitable structural changes in practical applications primarily due to the electrochemical aging of the polymer.…”

One-step solution combustion synthesis of cobalt–nickel oxides/C/Ni/CNTs nanocomposites as electrochemical capacitors electrode materials

“…Considerable efforts have been made to overcome these shortcomings of cobalt oxides. One approach involves introduction of conductive materials, such as carbonaceous materials (activated carbon [20], graphene [13,21], carbon nano-tubes(CNTs) [22], and carbon fibers [23,24]), metal nano-particles (Au [25]) or conductive polymers (polypyrrole [26], and 3,4-ethylenedioxythiophene [27]), into the electroactive cobalt oxides, in order to improve the electric conductivity of these composite systems. For instance, 20 nm sized Co 3 O 4 nano-particles are in-situ grown on the chemically reduced graphene oxide (rGO) sheets to form a rGOCo 3 O 4 composite via a hydrothermal process, which exhibits a specific capacitance of 472 F g À1 at a scan rate of 2 mV s À1 and 95.6% capacitance retention after 1000 cycles [13].…”