Hydrogen Storage Hydrogen storage in Ni-based coordination polymer Change in mass during heating in hydrogen Dehydration of a Ni-based complex causes polymerization and creation of lamellar coordination polymer. This polymer exhibits substantial hydrogen storage capacity at temperatures above 300K of around 1 mass% at hydrogen pressure of 1 atm. On heating, adsorbed hydrogen is released below 500K. Adsorption enthalpy of around 25 kJ/mol and latent heat of 4.9kJ/mol suggests that this material is a promising hydrogen storage material. DFT calculations on a model tetramer system show that the average hydrogen bonding enthalpy is 15-17 kJ/mol, for randomly placed hydrogen molecules. Extrapolation of hydrogen storage capacity of this material under higher pressures shows that it could exhibit 7.7 wt.% gravimetric and ovr 130 g/L volumetric capacity at 40atm of hydrogen pressure and room temperature. This would satisfy the ultimate performance goals for on-board applications. Change in pressure during hydrogen adsorption at 1 and 1.6 atm starting hydrogen pressure