Hydrogen Storage Materials Discovery via High Throughput Ball Milling and Gas Sorption

Abstract

The lack of a high capacity hydrogen storage material is a major barrier to the implementation of the hydrogen economy. To accelerate discovery of such materials, we have developed a high-throughput workflow for screening of hydrogen storage materials in which candidate materials are synthesized and characterized via highly parallel ball mills and volumetric gas sorption instruments, respectively. The workflow was used to identify mixed imides with significantly enhanced absorption rates relative to Li2Mg(NH)2. The most promising material, 2LiNH2:MgH2 + 5 atom % LiBH4 + 0.5 atom % La, exhibits the best balance of absorption rate, capacity, and cycle-life, absorbing >4 wt % H2 in 1 h at 120 °C after 11 absorption-desorption cycles.

The Potential Applications of Nanoporous Materials for the Adsorption, Separation, and Catalytic Conversion of Carbon Dioxide

“…As a result instrument manufacturers are attempting to develop automated high throughput gas adsorption analyzing units. One notable example of which is a volumetric technique that can analyze 28 samples in parallel recently developed by Wildcat Discovery Technology Inc. [ 28 ] This apparatus has recently been demonstrated in a high throughput study of cation exchanged forms of zeolites Na-A (LTA) and Na-X (FAU) for use in CCS, with the results acquired from the high throughput analyzer validated against data acquired from a conventional Micromeritics ASAP 2020 gas adsorption analyzer. [ 29 ] Zeolites have already been widely used in many industrial processes.…”

Effective thermodynamic alteration to Mg(NH2)2–LiH system: achieving near ambient-temperature hydrogen storage

“…353 K, moderate hydrogen desorption temperatures, high equilibrium pressures, 10 excellent reversibility, 11 good water saturated stability and so on. 12 A number of investigations [13][14][15][16][17][18] targeting at kinetic improvement led to a remarkable temperature drop from ca. 523 to 380 K, at which the equilibrium pressure was ca.…”

Solid–Solid Heterogeneous Catalysis: The Role of Potassium in Promoting the Dehydrogenation of the Mg(NH2)2/2 LiH Composite

“…[22,23] Considerable efforts have been paid to the catalytic modification of the system. [24][25][26][27][28][29][30][31][32][33][34][35] However, because additives have to interact with the reacting species at the interface or be accommodated in the solid phases to assist mass transport, most conventional hydrogenation catalysts, such as Ti, Co, Ni, Pd, Pt, and/or their salts, are found to have a limited effect on this system. [24,29] Recently, we found that the introduction of a small amount of KH can significantly enhance the reaction kinetics; in particular, reversible hydrogen release and uptake can be performed at a temperature as low as 107 8C.…”