The potential of organic polymer-based hydrogen storage materials.
The challenge of storing hydrogen at high volumetric and gravimetric density for automotive applications has prompted investigations into the potential of cryo-adsorption on the internal surface area of microporous organic polymers. A range of Polymers of Intrinsic Microporosity (PIMs) has been studied, the best PIM to date (a network-PIM incorporating a triptycene subunit) taking up 2.7% H(2) by mass at 10 bar/77 K. HyperCrosslinked Polymers (HCPs) also show promising performance as H(2) storage materials, particularly at pressures >10 bar. The N(2) and H(2) adsorption behaviour at 77 K of six PIMs and a HCP are compared. Surface areas based on Langmuir plots of H(2) adsorption at high pressure are shown to provide a useful guide to hydrogen capacity, but Langmuir plots based on low pressure data underestimate the potential H(2) uptake. The micropore distribution influences the form of the H(2) isotherm, a higher concentration of ultramicropores (pore size <0.7 nm) being associated with enhanced low pressure adsorption.
Budd
Peter M
PM
Organic Materials Innovation Centre, School of Chemistry, University of Manchester, Manchester, UK M13 9PL. peter.budd@manchester.ac.uk
Butler
Anna
A
Selbie
James
J
Mahmood
Khalid
K
McKeown
Neil B
NB
Ghanem
Bader
B
Msayib
Kadhum
K
Book
David
D
Walton
Allan
A
D000042:Absorption; D011211:Electric Power Supplies; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods*; D004735:Energy Transfer; D005240:Feasibility Studies; D006859:Hydrogen / Q000737:chemistry*; D009930:Organic Chemicals / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*
D009930:Organic Chemicals; D011108:Polymers; D006859:Hydrogen