University of Sharjah

Pragati Ankush Shinde

Abdul Ghani Olabi

Mohammad Ali Abdelkareem

Nilesh R Chodankar

Mohammad Ali

A structure of an asymmetric supercapacitor and a preparation method thereof is disclosed. In some implementations, the preparation comprises the steps of forming a polyaniline (PANI) nanowire on carbon cloth (CC) substrate (PANI/CC) by polymerization of an aniline, depositing a cobalt-nickel layer double hydroxides (CoNi-LDHs) on the PANI/CC by a hydrothermal process, and calcining of the cobalt-nickel layer double hydroxides (CoNi-LDHs) in the PANI/CC at a high temperature to form a metal carbide (CoC@NiC) on the carbon cloth. The structure of the asymmetric supercapacitor includes a metal carbide (CoC@NiC) as a positive electrode, a tungsten trioxide (WO@C) as a negative electrode, and a poly (vinyl alcohol)/Potassium hydroxide (PVA/KOH) as an electrolyte gel.

Asymmetric supercapacitor

Structure of an asymmetric supercapacitor and method of preparation thereof

There is disclosed a process of producing a hybrid super-capacitor (HSC) electrode, the process comprising performing nitridation-induced in situ coupling of Ni—CoN nanoparticles in an N-doped carbon matrix, wherein the resultant hybrid super-capacitor (HSC) electrode is a Ni—CoN@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—CoN-2@NC as a positive electrode and AC as a negative electrode with a PVA (poly vinyl alcohol)/KOH as a gel electrolyte.

Nitridation-induced in situ coupling of Ni-CON particles in nitrogen-doped carbon nanosheets for hybrid supercapacitors

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@CuSe (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 gfor NiCuSe and 573.8 mA h gfor FeSe at current density of 1 A g, respectively. The solid-state HSC cell with NiCuSe cathode and FeSe anode delivers a highest specific energy of 87.6 Wh kgand excellent cycle lifetime with capacity retention of 91.3% over 10,000 cycles.

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Sharjah, United Arab Emirates

Pragati Ankush Shinde