Reversible hydrogen storage capacity of Sc and Y functionalized [1,1]paracyclophane: Insights from density functional study

TL;DR

This study uses density functional theory to demonstrate that Sc and Y functionalized [1,1]paracyclophane can reversibly store significant amounts of hydrogen with favorable thermodynamic properties, making them promising for energy applications.

Contribution

It provides a detailed theoretical analysis of hydrogen storage capacities and stability of Sc and Y functionalized [1,1]paracyclophane, highlighting their potential as reversible hydrogen storage materials.

Findings

Maximum gravimetric density up to 8.22 wt% for Sc and 6.33 wt% for Y.

Reversible hydrogen adsorption confirmed at temperatures above room temperature.

Hydrogen capacities meet US-DOE 2025 criteria.

Abstract

This work reports the hydrogen storage, and delivery capacities of Sc and Y functionalized [1,1]paracyclophane using dispersion corrected density functional theory calculations. The Sc and Y atoms are bind strongly with benzene rings of [1,1]paracyclophane. Each Sc and Y atom functionalized over [1,1]paracyclophane adsorb up to 6 H2 molecules via Kubas interaction achieving maximum gravimetric density up to 8.22 wt% and 6.33 wt%, respectively. The calculated average hydrogen adsorption energy (0.36 eV) is lower than the chemisorption but higher than the physisorption process. The kinetic stabilities are verified through the HOMO-LUMO gap and different global reactive descriptors. ADMP molecular dynamics simulations reveal the reversibility of adsorbed H2 molecules at sufficiently above the room temperature and the solidity of host material at 500 K. Average Van't Hoff desorption temperature for Sc and Y decorated system was calculated to be 439 K and 412 K respectively at 1 atm of pressure. The estimated thermodynamically usable hydrogen capacities are found to be 5.92 wt% and 5.87 wt% of hydrogen which fulfil the hydrogen energy criteria (by 2025) of US-DOE. Hence, we believe that Sc and Y functionalized [1,1]paracyclophane can be considered as a thermodynamically viable, and potential reversible hydrogen storage materials at ambient environment.