Microwave-assisted hydrothermal synthesis of Mn3O4/reduced graphene oxide composites for high power supercapacitors

Mn3 O4 nanoparticles on activated carbonitride by soft chemical method for symmetric coin cell supercapacitors

“…When the current density increased to 5 A/g, it could be still maintained at 56% of the initial specific capacitance, showing the better rate performance. [36][37][38][39][40] To sum up, MONC has excellent electrochemical properties owing to the following reasons: (a) the addition of NC with good conductivity boosts the transport of electrons; (b) good supporting of NC leads to Mn 3 O 4 nanoparticles grown well on the surface. Energy density and power density are important indicators for evaluating the performance of supercapacitors.…”

High-performance all-solid-state flexible supercapacitors based on manganese dioxide/carbon fibers

“…Typically, highly conductive fibers such as metal wires or carbon-based fibers are needed as current collector and the latter one can also be used as electrodes directly. To further increase the capacitance and energy density of fiber SCs, pseudocapacitive materials could be used, such as metal oxides, metal hydroxides and conductive polymer [17][18][19]. Researchers have explored many smart systems using different fiber electrodes, such as carbon nanotubes (CNTs) fiber [20], reduced graphene oxide (rGO) fiber [21], rGO on Au wire [22], PEDOT/CNTs fiber/Pt wire [23], M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 3 rGO/CNTs fiber [24], MnO 2 /rGO fiber [6] and so on.…”

Hierarchically Porous Carbon with Manganese Oxides as Highly Efficient Electrode for Asymmetric Supercapacitors

“…However, the loading of MnO 2 (78-80 wt %) caused an obvious loss in utilizing Mn oxides for charge storage. [33,39] The low utilization efficiency of MnO 2 is mainly attributed to the fact that the reported results did not consider the ion transport inside the MnO 2 /carbon composites, leading to a waste of large portions of Mn oxides. Because the utilization of electrochemically active materials and power capability are closely related to the specific surface area and pore-size distribution of electrode materials, [40] the architecture of microstructure-controllable host materials for loading nanoscopic MnO 2 to balance electron and ion transport inside the composites, as well as mass loading, is a solution to the above issues.…”

“…To achieve the highest cell voltage of this asymmetric EC, CVs of both electrodes in Na 2 SO 4 (1 m) and NaHCO 3 (5 mm) were obtained (Figure 5 a). [39] Both HPCs and MnO 2 /HPCs exhibit ideal capacitive behavior with specific capacitances of 138 and 196 F g À1 , respectively, in the complementary potential window. Notably, the specific capacitance of HPCs employed herein is 61 and 138 F g À1 , when the potential windows are fixed from 0 to 1 V and from 0 to À1 V, respectively, presumably due to the contribution of pseudocapacitance in the negative potential region.…”