Thermodynamic Parameters (Enthalpy and Entropy) of Hydrogen Storage in Ultrasound-Assisted Synthesized Selenium Decorated Fullerene

Abstract

This study includes the synthesis of a novel fullerene composite for hydrogen storage application. In the first step of this work the fullerene of the type C₆₀ was used to prepare its composite with selenium nanoparticles (Se Nps). The synthesis method was novel as it includes the synthesis of fullerene-Se nanocomposite via ultrasound at 750 W using ascorbic acid as reducing agent to convert selenium ion into selenium nanoparticles. Different techniques (XRD, SEM, TEM) were used to diagnose the composition, size and morphology of the prepared composite. The characterization results from SEM and TEM demonstrate the formation of sphere-like structures decorated on rod nanoparticles, proving the formation of required nanocomposite. Moreover, the XRD pattern demonstrates the existence of fullerene and selenium nanoparticles peaks with high purity. The important of this nanocomposite was comprehended from the using it in the hydrogen energy application. The study was conducted at 77, 173, 223 and 273 K and 0–90 bar and the study proves the physical adsorption at 55 bar as it showed 4.1 wt% storage with enthalpy of 0.13 KJ/(mol H₂) and entropy of 0.70 J/mol H₂. K.