A review on challenges to remedies of MnO2 based transition-metal oxide, hydroxide, and layered double hydroxide composites for supercapacitor applications

Self -templated construction of hollow trimetallic MnNiCoP yolk–shell spheres assembled with nanosheets as a satisfactory positive electrode material for hybrid supercapacitors

“…6 It is known that electrode materials play an important role in the electrochemical performance of supercapacitor systems. 3 Several materials, such as transition metal-based oxides (TMOs), [7][8][9] sulfides (TMSs), [10][11][12] and phosphides (TMPs), [13][14][15][16] have been extensively considered and investigated in recent years as electrode materials for pseudocapacitors.…”

Theoretical investigation of quantum capacitance of Co-doped α-MnO2 for supercapacitor applications using density functional theory

“…4,5 Various electrode materials have been widely used as supercapacitive electrode materials, such as carbon materials, conducting polymers, and metal oxides/hydroxides. [6][7][8] Manganese dioxide (MnO 2 ) as an electrode material is of great interest due to its alterable chemical, structural, and electronic properties. It exists in various polymorphic forms such as a (hollandite), b (pyrolusite), g (intergrowth), d (birnessite), R (Ramsedellite), and l (spinel) phases (layered and tunneled structures).…”

“…Apart from such excellent properties, the practical performance of a-MnO 2 for SCs has certain limitations owing to its poor electrical conductivity. 8,24,25 The conductivity and supercapacitive performance of MnO 2 can be enhanced by combining it with more conductive materials such as carbonaceous materials and conducting polymers. 26,27 Another method is defect engineering, i.e.…”

In Situ Growth of MnO2 Nanosheets on a Graphite Flake as an Effective Binder-Free Electrode for High-Performance Supercapacitors

“…Compared with other metal materials, MnO 2 has the characteristics of wide potential window (about 1 V), wide source of raw materials, and environmental friendliness. − Moreover, the large specific surface area and high pseudocapacitance of nanoscale MnO 2 can exhibit good applied advantages when it is used as an electrode material for supercapacitors . For instance, Yu et al reported that printed polyacrylonitrile (PAN) was used as a scaffold to deposit highly ordered MnO 2 nanopillars for supercapacitor materials, and the specific capacitance (SC) was 603 F/g at a scan rate of 5 mV/s .…”

“… 27 − 30 Moreover, the large specific surface area and high pseudocapacitance of nanoscale MnO 2 can exhibit good applied advantages when it is used as an electrode material for supercapacitors. 31 For instance, Yu et al reported that printed polyacrylonitrile (PAN) was used as a scaffold to deposit highly ordered MnO 2 nanopillars for supercapacitor materials, and the specific capacitance (SC) was 603 F/g at a scan rate of 5 mV/s. 32 Zhang et al showed that the electrochemical performance of pure MnO 2 could be improved using the electrodeposition method by controlling the applied voltages, and the SC value could reach as high as 469 F/g at a current density of 1 A/g when the applied voltage was controlled at 0.6 V. 33 Wu et al.…”