MoS nanoflower decorated bio-derived chitosan nanocomposites for sustainable energy storage: Structural, optical and electrochemical studies.

Bio-derived chitosan-molybdenum di sulfide (Cs-MoS) nanocomposites are prepared by a simple and economical aqueous casting method with varying concentrations of MoS. The structural, surface morphological, optical, and electrochemical properties of the nanocomposites were studied. FTIR analysis reveals the strong interaction between Cs and MoS. FESEM micrograph showed an increment of the surface roughness due to the incorporation of MoS layers into Cs. The surface wettability of the nanocomposites was found to be decreased from 73° to 33° due to the incorporation of MoS into the chitosan. UV-vis spectroscopy study demonstrates a reduction of optical bandgap from 4.29 to 3.44 eV as the nanofiller, MoS introduces localized states within the forbidden energy bandgap. The incorporation of MoS was found to increase the specific capacitance of Cs from 421 mFg to 1589 mFg at a current density of 100 μAg. The EIS analysis revealed an increase in the pseudo-capacitance from 0.09 μF to 4.13 μF and a reduction of charge transfer resistance that comes from the nanofiller contribution. MoS nanoflower introduces more active sites and expands the electroactive zone, thus improving the charge storage property of Cs. The Cs-MoS may offer a new route for the synthesis of eco-friendly, biodegradable, and electrical storage devices.