High performance nitrogen-doped porous graphene/carbon frameworks for supercapacitors

Abstract

Nitrogen-doped porous graphene/carbon (NPGC) framework electrode materials have been synthesized via chemical activation of graphene oxide/polypyrrole (GOP) composites with KOH. The effects of the mass ratio of KOH/GOP and activation temperature on the electrochemical performance of NPGC have been discussed. It is found that the NPGC prepared by activating GOP (GO : Py ¼ 1 : 40) with 3.5 times mass of KOH at 650 C (NPGC650) exhibits the highest specific capacitance of 405 F g À1 at a current density of 0.2 A g À1 . Particularly, the specific capacitance still remains at 249 F g À1 even at a current density as high as 10 A g À1 . Moreover, 96% of the capacitance can be retained after 1000 cycles even under a high operation current of 10 A g À1 . The present work provides a novel strategy to synthesize NGPC electrode material for supercapacitors.

Sulfur-doped mesoporous carbon from surfactant-intercalated layered double hydroxide precursor as high-performance anode nanomaterials for both Li-ion and Na-ion batteries

“…4b) shows a distinct IV isotherm with a H 2 -type hysteresis loop (P/P 0 > 0.4), indicative of the presence of the obtained mesoporous structure. This situation is generally associated with capillary condensation in mesopores, as reported previously for various nanocarbons with mesoporous structures [22,23]. Calculated by the BET method, the SMAC sample was found to exhibit a large apparent specific surface area of 645.4 m 2 g À1 and a total pore volume of 0.7 cm 3 g À1 .…”

TiO2 nanorod-intercalated reduced graphene oxide as high performance electrode material for membrane capacitive deionization

“…This system was controlled using VersaStat4 potentiostat device. Herein, the specific capacity was calculated by integrating the area of the CV curve to determine the average value according to the following equation [37].…”

Nitrogen-enriched porous carbon nanofiber networks for binder-free supercapacitors obtained by using a reactive surfactant as a porogen

“…This peak is typically attributed to the (0 0 2) planes of the graphite structure, suggesting that a small amount of graphite microcrystals was formed during the annealing process. A weak diffraction peak at 2u = 43.5 , assigned to the (1 0 1) planes of graphene [40], was found for the PA-800, PA-850 and PA-900 samples, suggesting that the addition of APEG promotes the formation of the graphene layer. The results from the Raman and XRD investigations are also consistent with the results from the TEM observations.…”