MnO₂ nanoflake/polyaniline nanorod hybrid nanostructures on graphene paper for high-performance flexible supercapacitor electrodes

Abstract

A facile two-step strategy is adopted to construct free-standing composite paper of MnO2 nanoflakes/polyaniline (PANI) nanorods hybrid nanostructures on reduced graphene oxide (RGO) for flexible supercapacitor electrode application.MnO2 nanoflakes are firstly grown on RGO paper via electrodeposition method, followed by assembly of PANI nanorods between MnO2 nanoflakes by in situ polymerization using camphorsulfonic acid as dopant. The morphology and structure of composite paper are characterized and the electrochemical properties are systematically investigated. The interconnected PANI nanorods deposited on the interlaced MnO2 nanoflakes have a length of ~100 nm and diameter of ~30 nm, creating plenty of open porous structures which are beneficial for ion penetration into the electrode. The RGO/MnO2/PANI composite paper shows a large specific capacitance of 636.5 F g -1 at 1.0 A g -1 in 1.0 M Na2SO4 electrolyte and excellent cycling stability (85% capacitance retention after 10 4 cycles). The optimized composite structure with more electroactive sites, fast ion and electron transfer, and strong structural integrity endows the ternary composite paper electrode with outstanding electrochemicalperformance.

MnO2 decorated on carbon sphere intercalated graphene film for high-performance supercapacitor electrodes

“…226.9 F g -1 and 162.9 F g -1 at 1 A g -1 , 2 A g -1 , 5 A g -1 and 10 A g -1 , respectively, the values are comparable to the previous studies, as shown in Table 1 [27][28][29][30][31][32][33][34][35]. Our 4-µm thick MCG flexible films with a packing density of 0.87 g cm -3 , which leads to a significant gravimetric capacitance of 277.8 F cm -3 , which is much higher than previously reports.…”

Free-Standing T-Nb2O5/Graphene Composite Papers with Ultrahigh Gravimetric/Volumetric Capacitance for Li-Ion Intercalation Pseudocapacitor

“…28,29 Numerous free-standing electrodes have been fabricated through mechanical mixing, chemical deposition or hydrothermal reaction of pseudocapacitive species with 2D flexible graphene. [30][31][32][33][34][35][36][37] These electrodes are generally consist of 5 pseudocapacitive components for high capacitance, and good ionic-electric conductive pathways for rapid ion diffusion and electron transport. 38,39 In addition, the electrodes are generally densely stacked without added binders and conductive additives, to achieving high volumetric capacitance.…”

Co3O4@CoS Core-Shell Nanosheets on Carbon Cloth for High Performance Supercapacitor Electrodes

“…Both Co 3 O 4 and CoS are employed as active materials, while the conductive CC as a current collector guarantees effective ion and electron transport throughout the electrode [34]. …”