Lithium and phosphorus-functionalized graphitic carbon nitride monolayer for efficient hydrogen storage: A DFT study.

We have explored the consequence of lithium and phosphorous functionalization on the graphitic carbon nitride (g-CN) monolayer for hydrogen storage using density functional theory. Both pristine and Li and P decorated g-CN show a semiconductor nature. The substantial overlap between the s orbital of Li and the p orbital of nitrogen near the Fermi level shows the binding between Li and the g-CN. The repositioning of HOMO and LUMO is noticed in the Li and P decorated g-CN. The Bader charge analysis indicates the charge allocation from the Li and P atom to the g-CN, which results in the adsorption of H by electrostatic interaction. The hydrogen storage capacity of 5.78 wt% is obtained after functionalizing Li and P into the g-CN. The obtained adsorption energies for the H adsorption and the H desorption temperature confirm that Li and P functionalized g-CN is a fascinating candidate for the reversible loading of H at ambient conditions.