Recently, a new hydrogen NMR signal has been observed in a number of PECVD prepared hydrogenated amorphous silicon (a-Si:H) films of varying quality. It is speculated that the signal is the consequence of a dipolar-coupled hydrogen pair separated, on average, by 1.8 ± 0.1 Å. To elucidate the possible bonding configurations responsible for the NMR data of ref. [1], we have used ab initio simulat...

In this study, an efficient method for using pulsed plasma to produce hydrogen from ammonia was developed. An original pulsed plasma reactor with a hydrogen separation membrane was developed for efficient hydrogen production, and its hydrogen production performance was investigated. Hydrogen production in the plasma was affected by the applied voltage and flow rate of ammonia gas. The maximum h...

Argonne National Laboratory (ANL) and the National Energy Technology Laboratory (NETL) are developing dense membranes for separating hydrogen from mixed gases, particularly product streams generated during coal gasification, methane partial-oxidation, and water-gas shift reactions. Hydrogen separation with these membranes is nongalvanic, i.e., it does not use electrodes or an external power sup...

Nitrate Ion-Separation The underlying prerequisite for materials design to achieve on-target separation of low nucleophilic nitrate ions has been unclear. By fabricating cation-ordered layered double hydroxides (LDHs) via topochemical reaction, in article number 2201484, Tomohito Sudare, Katsuya Teshima, and colleagues demonstrate that the hexagonal arrangement effectively facilitates a stable ...

Grand canonical Monte Carlo simulations (GCMC) are carried out to investigate the separation of hydrogen and carbon dioxide via adsorption in activated carbons. In the simulations, both hydrogen and carbon dioxide molecules are modeled as Lennard-Jones spheres, and the activated carbons are represented by a slit-pore model. At elevated temperatures (T = 505 and 923 K), the activated carbons exh...

This paper deals with an experimental investigation on water photosonolysis for hydrogen production. Water splitting is obtained by superposition of photolysis and sonolysis phenomena (photosonolysis) which are induced by the combined action of sunlight and ultrasounds. An experimental device was realized to investigate such phenomena; experimental tests were carried out: hydrogen production in...

Cyanobacteria are photoautotrophic prokaryotes with a remarkable metabolic flexibility. Many species of cyanobacteria produce hydrogen, and the efficiency of this process can be improved by genetic engineering. Isolated photosynthetic complexes of cyanobacteria that are capable of light absorption and charge separation can be utilized in hydrogen-producing devices that are driven by solar energ...

The storage capacity of hydrogen on Na-decorated born nitride nanotubes (BNNTs) is investigated by using density functional theory within Quantum Espresso and Gaussian 09. The results obtained predict that a single Na atom tends to occupy above the central region of the hexagonal rings in (5,0) and (3,3) BNNT structures with a binding energy of -2.67 and -4.28 eV/Na-atom respectively. When a si...

Hydrogen energy is a crucial carrier for the growth of system and its low-carbon transformation. Using natural gas as hydrogen transport pipeline network transportation significant step toward realizing large-scale long-distance transport. Hydrogen-mixed mainly separated into by physical methods at present. High purity recovery, but recovery rate low. At same time, compared with gas, liquefied ...

The aim of this work theoretical study is to theoretically investigate a inorganic membrane assisted purifcation process of an H2-rich stream derived from a conventional methanol steam reforming stage. In particular, a black-box model for multicomponent gas mixture purifcation is dev...