High H2 Adsorption by Coordination-Framework Materia

The storage of H2 in a safe and compact form represents a
significant current challenge,[1] and there is wide-ranging
interest in materials that can store and release H2 with fast
kinetics and high reversibility over multiple cycles.[2] Porous
coordination frameworks have become competitors to other
porous materials, such as zeolites[3] and carbon materials (for
example, activated carbon or nanotubes),[4] with recent
studies confirming that these frameworks can store considerable
quantities of H2 at 78 K.[511] Most studies of H2
adsorption in coordination frameworks focus on the lowpressure
region (01 bar) and, therefore, do not fully address
the relationship between porosity and storage capacity.
Although recent high-pressure volumetric measurements on
some coordination frameworks revealed a correlation
between maximum uptake and surface area,[9] the study
involved several coordination frameworks with different
structure types, and the influence of pore size and shape on
guest adsorption was not investigated systematically. Herein,
we report the structures of three close structural analogues,
along with studies of high-pressure H2 adsorption by these
materials, to establish a route to higher H2 storage capacity. 智能重量法吸附分析仪