Abstract: There is disclosed a process of producing a hybrid super-capacitor (HSC) electrode, the process comprising performing nitridation-induced in situ coupling of Ni—Co4N nanoparticles in an N-doped carbon matrix, wherein the resultant hybrid super-capacitor (HSC) electrode is a Ni—Co4N@NC electrode. The resultant hybrid super-capacitor (HSC) electrode is a self-supported metal nitride coordinated with N-doped carbon, wherein the nitridation-induced in situ coupling is performed via a facile pyrolysis of layered Ni—Co hydroxide decorated on polyaniline (PANI) nanotubes on the basis of a carbon cloth (CC). Also disclosed is a hybrid supercapacitor cell assembled by employing Ni—Co4N-2@NC as a positive electrode and AC as a negative electrode with a PVA (poly vinyl alcohol)/KOH as a gel electrolyte.

Abstract: There is disclosed a process of producing a hybrid super-capacitor (HSC) electrode, the process comprising performing nitridation-induced in situ coupling of Ni—Co4N nanoparticles in an N-doped carbon matrix, wherein the resultant hybrid super-capacitor (HSC) electrode is a Ni—Co4N@NC electrode. The resultant hybrid super-capacitor (HSC) electrode is a self-supported metal nitride coordinated with N-doped carbon, wherein the nitridation-induced in situ coupling is performed via a facile pyrolysis of layered Ni—Co hydroxide decorated on polyaniline (PANI) nanotubes on the basis of a carbon cloth (CC). Also disclosed is a hybrid supercapacitor cell assembled by employing Ni—Co4N-2@NC as a positive electrode and AC as a negative electrode with a PVA (poly vinyl alcohol)/KOH as a gel electrolyte.

Abstract: There is disclosed a method and a system for a versatile in-situ approach to design the nanostructured transition metal selenide (TMS) materials for the high-energy solid-state hybrid supercapacitors (HSCs). Initially, the rose-nanopetals like NiSe@Cu2Se (NiCuSe) cathode and FeSe nanoparticles anode are directly anchored on 3D highly conducting Cu foam via purposefully in-situ conversion reactions. The different potential windows of the NiCuSe and FeSe in aqueous electrolytes associated with the excellent electrical conductivity and redox activity results in the superior electrochemical features for the half cell with maximum specific capacity of 534.2 mA h g?1 for NiCuSe and 573.8 mA h g?1 for FeSe at current density of 1 A g?1, respectively. The solid-state HSC cell with NiCuSe cathode and FeSe anode delivers a highest specific energy of 87.6 Wh kg?1 and excellent cycle lifetime with capacity retention of 91.3% over 10,000 cycles.