This study aims to green synthesize and full characterize CdO nanoparticles by means of an environmentally friendly synthesis using Crocus sativus in its reaction with cadmium ions. The CdO nanoparticles were characterized and their purity was confirmed by XRD and UV.-Vis. spectroscopy. Moreover, scanning electron microscopy (SEM) showed that the prepared cadmium oxide nanoparticles were polymorphic. Furthermore, cadmium oxide nanoparticles were cast in the gas storage (H 2) study. The hydrogen storage results prove that the maximum H 2 uptake was equal to 2.85 Wt.%H 2 at a pressure of 69 bar at 77 K with ∆H=0.62607 KJ/mol H 2 and ∆S=3.35697 J/mol H 2. K. Moreover, the thermodynamic studies under four different temperatures proves that the maximum H 2 uptake could be recorded at a pressure limit of 69-86.2 bar.

Nanofiller-doped polymer electrolyte-based electrochemical devices are now emerged as a novel material for electrochemical devices. This paper reports a solid polymer electrolyte film doped with a new nanofiller synthesized by the solution casting technique. Electrical, Optical, and photoelectrochemical characterization are presented in detail. Electrochemical impedance spectroscopy (EIS) shows with the dispersion of nanofillers conductivity increases attains maxima and decreases. The maximum conductivity was at 0.05 wt% nanofiller concentration of 3.25 x 10 -5 S/cm. The calculated ionic transference value was 0.92 which shows the domency of the system as ionic. The linear sweep voltammetry confirms a high electrochemical stability window (ESW) of 4.01V. Sandwitched electrical double-layer capacitors (EDLC) has been developed using carbon-based electrodes and sandwitched nanofiller dispersed polymer electrolyte, showing a high specific capacitance value of ~ 200 F/g.