Redox active electrolyte supercapacitors differ significantly from the conventional electrolytes based storage devices but face a long term stability issue which requires a different approach while designing the systems. Here, we show the change in layered double hydroxides (LDHs) systems with rare earth elements (lanthanum) can drastically influence the stability of two dimensional LDH systems in redox electrolyte. We find that the choice of rare earth element (lanthanum) having magnetic properties and higher thermal and chemical stability has a profound effect on the stability of La–Co LDHs electrode in redox electrolyte. The fabricated hybrid device with rare earth based positive electrode and carbon as negative electrode having redox electrolyte leads to long stable high volumetric/gravimetric capacity at high discharge rate, demonstrates the importance of considering the rare earth elements while designing the LDH systems for redox active supercapacitor development.

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Heteroatom doping in carbon displays exciting chemistry and plays an extremely important role in improving electrochemical performances. For instance, in energy storage devices, carbon allotropes showed excellent capacitive characteristics, however, their limiting ion storing capability cannot meet current requirements. Herein, the work discusses a simple technique for developing functionalized N-doped carbon to provide an easy access to ion percolation with high specific surface area of 709.09 m 2 g À1 . The optimized carbon material delivers high gravimetric capacitance 295Fg À1 with high volumetric capacitance of 270Fcm À3 . Also, the high electrochemical performance of its symmetric device 268Fg À1 at 0.25 Ag À1 current density with noticeably high cyclic stability of 100 000 cycles with 90% capacitance retention reveals an excellent approach to the device applications. These results imply an optimized nitrogen content that strongly influences the electrochemical performance of carbon material and opens up opportunities for designing high-performance energy storage devices.