Title : Mn3O4 assimilated Broccoli-Flower like Nickel Manganese Selenide Composite for Ultra- efficient Solid-State Hybrid Supercapacitors
Innovative renewable energy sources for energy storage/conversion is the demand of the current scenario in electrochemical machinery. In this context, choosing suitable organic precipitants for tuning the crystal characteristics and microstructures is a challenge. Moreover, simple method which employ non- toxic solvent are of prime significance to prepare novel nanostructured materials in the energy storage applications. With the same notion, herein we report broccoli flower-like porous Mn3O4/NiSe2−MnSe2 composite synthesized using a simple two step hydrothermal synthesis procedure assisted by sluggish precipitating agent and an effective cappant followed by intermediated anion exchange. The as-synthesized material was exposed to physical and chemical measurements depicting significant crystallinity, stronger bonding and broccoli flower-like porous arrangement. The material was assessed electrochemically by cyclic voltammetry (CV), chronopotentiometry (CP) and electrochemical impedance spectroscopy (EIS) measurements. The Electrochemical studies reveal redox behavior, supercapacitive charge-discharge shape and extremely low charge transfer resistance with very low relaxation time constant. Further, the fabricated Mn3O4/NiSe2−MnSe2 composite (as positive electrode material) based solid-state hybrid supercapacitor (Mn3O4/NiSe2−MnSe2 ||N-rGO) delivers excellent rate specific capacity/capacitance, very low internal resistance, very low relaxation time constant, with energy density (~34 W h kg–1) of a typical rechargeable battery and power density (11995 W kg–1) of an ultra-supercapacitor. Consequently, it can be a favorable contender for supercapacitor applications for high performance energy storage utilizations. A definitive exhibition of the supercapacitor device is credited to ² electrolyte-ion repository ² alike behaviour of broccoli flower like Mn3O4/NiSe2−MnSe2, enhanced by upgraded electronic and ionic conductivities of N-doped rGO (negative electrode) and PVA/KOH gel (electrolyte separator), respectively.
Audience take away:
- From this presentation audience will learn new and easy synthesis of transition metal selenides.
- The assembling of solid state hybrid supercapacitors will be demonstrated.
- A new and growing field to explore for researcher and academicians.
- Provides practical solution to the energy storage problems.
- Will improve the design of available solid state hybrid supercapacitors.