H₂ Storage in Microporous Carbons from PEEK Precursors

Abstract

Large surface area (524-3275 m 2 /g) microporous carbons (MPCs) derived from poly(etheretherketone), or PEEK, have been synthesized and categorized for their roles as H 2 storage materials. It was found that, because of their very large surface areas (g3000 m 2 /g), large cumulative pore volumes (∼1.7 cm 3 /g), and small pore sizes (predominantly e3 nm), these materials displayed impressive H 2 sorption properties, including excess gravimetric and volumetric H 2 storage capacities of approximately 5 wt % and 35 g/L, respectively, at 77 K and 20 bar.

Electroneutrality breakdown and specific ion effects in nanoconfined aqueous electrolytes observed by NMR

“…A highquality nanoporous carbon derived from polymer polyetheretherketone (PEEK) 22,23 is used to provide the hydrophobic nanoconfinement in this work (see Methods). The activated carbon sample is designated as P-40 and the average pore size is 0.9 nm from wall surface to wall surface assuming a slit-shaped pore (1.2 nm from carbon centre to carbon centre) according to the previous study 17 .…”

Anomalous Isosteric Enthalpy of Adsorption of Methane on Zeolite-Templated Carbon

“…9,13,14 The apparatus was equipped with a digital cold cathode pressure sensor (I-MAG, Series 423), a highresolution pressure manometer (MKS Baratron, Model 120AA), a high pressure manometer (MKS Baratron, Model 833), and a molecular drag pump to achieve a measurable pressure range of 10 -5 to 10 7 Pa. Temperature was measured on the wall of the manifold and on the outer wall of the sample holder using K-type thermocouples and platinum resistance thermometers (PRTs).…”

Accelerating the Understanding and Development of Hydrogen Storage Materials: A Review of the Five-Year Efforts of the Three DOE Hydrogen Storage Materials Centers of Excellence

“…For example, McNicholas and colleagues at Duke made pyrolyzed polyether ether ketone (PEEK) materials and worked with NREL, Caltech, NIST, and UNC to optimize its pore structures to produce carbonbased sorbents with tunable pore sizes that provide excellent gravimetric and volumetric hydrogen storage capacities. [124] This and other synthesis techniques were employed by the HSCoE to develop a number of different high-SSA materials. Typically, materials made by these processes followed the general empirical rule of 1 percent by weight (wt pct) maximum excess H 2 storage capacity for every 500 meter square area per gram (m 2 /g) SSA at 77 K (À196°C) and~30 to 60 bar.…”

“…Several materials were made with SSAs>2500 m 2 /g that had~5 wt pct excess H 2 storage capacities at 77 K (À196°C). However, unlike commercially available activated carbons that typically have bulk densities of 0.1 to 0.3 g/mL, several of these materials developed by McNicholas and Yuan et al [124,125] have pore sizes in the range of 0.7 to 1.5 nm, which enable bulk densities between 0.7 and 1.4 g/mL. With~5 wt pct excess capacity, these materials have volumetric capacities over 35 g/L.…”