Adsorption of acetylene on exfoliated graphite surface: energetic and stereographic studies by applying statistical physics treatment
Yosra Ben Torkia, Wouroud Sghaier, Mohamed Bouzid, Mohsen Trabelsi, Abdelmottaleb Ben Lamine
Abstract
Thermodynamic, energetic, and stereographic parameters controlling the acetylene adsorption on (0001) exfoliated graphite were determined. The results showed that statistical physics model 2 (monolayer with two energies) has the best correlation with the experimental data. The adsorption of acetylene molecules on exfoliated graphite surface is multimolecular adsorption. The adsorption entropies and the Gibbs free enthalpies were determined for temperature ranging from 147.72 K to 161.50 K. The obtained adsorption energy distributions show the same maximum value of 5.6 kJ.mol−1. The stereographic parameters evolution with temperature is related to the two-dimensional (2D) critical temperature, and their values suggest the formation of polyacetylene.