Novel pi-conjugated iron oxide/reduced graphene oxide nanocomposites for high performance electrochemical supercapacitors

作者：Bhattacharya Gourav; Kandasamy Ganeshlenin; Soin Navneet; Upadhyay Ravi Kant; Deshmukh Sujit; Maity Dipak; McLaughlin James; Roy Susanta Sinha

来源：RSC Advances, 2017, 7(1): 327-335.

DOI：10.1039/c6ra25630a

A novel nanocomposite consisting of p-conjugated 2-aminoterephthalic acid (ATA) coated iron oxide (Fe3O4) nanoparticles and reduced graphene oxide (RGO) has been synthesized using a facile combination of wet-chemistry and low-power sonication. The ATA-Fe3O4/RGO nanocomposites exhibited a high specific capacitance of the order of 576 F g(-1); significantly higher than that of pristine Fe3O4 (132 F g(-1)) and RGO (60 F g(-1)) counterparts, indicative of a synergistic effect between the ATA-Fe3O4 and RGO components. Furthermore, the maximum energy storage density was calculated to be 75 W h kg(-1) (at a current density of 6 A g(-1)). The charging-discharging analysis showed promising long-term stability with nearly 86% retention of the capacitance after 5000 cycles. The superior capacitive behaviour of these ATA-Fe3O4/RGO nanocomposites is attributed to the synergistic effect of the p-conjugated ATA coating on Fe3O4 which enhances the pseudo-capacitive charge transfer process of Fe3O4 and works in conjunction with the surface functional groups (such as carboxylic, amino and amide) present on the RGO surface, providing enhanced double layer capacitance. Thus, the current system exploits the advantages of both the double layer capacitors and pseudocapacitors in a hybrid structure.

• 出版日期2017