Especially, unique bicontinuous structures endow such composites with a great specific capacitance of the constituent MnO2 (~1100 F g−1), very close to the theoretical value.
The galvanostatic charge discharge test of the CoAl-LDH/CSs composite shows a great specific capacitance of 1198 F/g at 1 A/g (based on the mass of the CoAl-LDH/CSs composite) in 6 mol/L KOH solution, and the composite displays an impressive specific capacitance of 920 F/g even at a high current density of 10 A/g.
Moreover, PANI electrode at the current density of 1 A g−1 reached its greatest specific capacitance of 539 F g−1 at 5% IPA content, with a secondary maximum of 475 F g−1 for 50% IPA content in aqueous phase, which were both higher than 444 F g−1 for the nanofibers prepared in the absence of IPA.
The N CNH shows a great specific capacitance of 240 F g−1 at the current density of 0.5 A g−1 in 1 M H2SO4 with three-electrode configuration and 44 F g−1 at the current density of 0.5 A g−1 as coin cell.
Furthermore, the new Ni(OH 2 phase demonstrates the great ability of delivering large specific capacitance at high rates.
Consequently large specific capacitance was observed.
Typical requirements include low area consumption, large specific capacitance, low capacitance tolerances, high quality factors and low parasitic substrate coupling.
Benefiting from the hierarchical structure and synergetic effect, the BPC/Fe2O3 nanocomposite exhibits high performances for supercapacitors, i.e., large specific capacitance up to 987.9 F g−1 (219.5 mAh g−1) at a current density of 1 A g−1, great rate capability (423.8 F g−1 at 30 A g−1), and superior cyclability (82.6% capacitance retention after 3000 cycles).
The treated CDC exhibits a great increase in specific capacitance (from 11.3 to 146 F g−1) and, most interestingly, an enhanced power capability, a rectangular shape being maintained in CV curves even at the scan rate of 500 mV s−1.
