Theoretical investigations on C 2 H 4 Nb complex as a potential hydrogen storage system, using moller–plesset (MP2) and density functional theory

• Published in: International journal of quantum chemistry 2014-04, Vol.114 (7), p.449-457
• Main Authors: Niaz, Saba, Manzoor, Taniya, Islam, Nasarul, Pandith, Altaf Hussain
• Format: Article
• Language: English
• ISSN: 0020-7608; 1097-461X
• DOI: 10.1002/qua.24587

Calculations based on second‐order Moller–Plesset and density functional theory (DFT) methods using different exchange and correlation functionals are performed on C 2 H 4 Nb organometallic complex for its hydrogen storage capacity. We found that this complex can store up to a maximum of 14 H 2 molecules using Becke‐3 Lee–Yang–Parr (B3LYP)/LanL2DZ method, with a gravimetric H 2 uptake capacity of 18.92 wt% and average binding energy of 0.52 eV/H 2 . The evaluation of the temperature dependence of the Gibbs free energy change (Δ G ) of H 2 adsorption process indicates that the adsorption of H 2 molecules is energetically favorable below 250 K using B3LYP (LanL2DZ) and PBEPBE (LanL2MB, LanL2DZ) level of theories. On the basis of the DFT descriptors, calculated at B3LYP (LanL2DZ) and B3PW91 (LanL2MB) level of theory, we found that the stability of the complex increases with increase in the number of H 2 molecules adsorbed by the complex. © 2013 Wiley Periodicals, Inc.