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Hydrogen - DOAJ

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Last Updated: 18 August 2022

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Recent advance of metal borohydrides for hydrogen storage

Hence, hydrogen storage technology has been one of the most significant steps in the application of hydrogen energy. Compared to the traditional compressed hydrogen storage technique, Solid-state hydrogen storage methods has a very high volumetric hydrogen density. The primary issue of solid-state hydrogen storage methods is the manufacturing of advanced hydrogen storage materials. This paper addresses mainly the development and challenges that remain to be addressed with metal borohydride storage materials for solid-state hydrogen storage.

Source link: https://doi.org/10.3389/fchem.2022.945208


Design of a vacuum system for space active hydrogen maser

We performed a study, based on the determination of the hydrogen flow and the adsorption efficiency of the adsorption unit, and developed a combined vacuum pump for the Space Active Hydrogen Maser based on the parameters of the vacuum system and the structural requirements. The total source hydrogen inflow in lifetime is not higher than 20% of the total capacity getter pump, so the layout should satisfactorily meet the SAHM vacuum system's requirements, and is of utmost importance for future SAHM applications.

Source link: https://doi.org/10.3389/fphy.2022.970705


Exosome mediated Tom40 delivery protects against hydrogen peroxide-induced oxidative stress by regulating mitochondrial function.

Overexpression studies have shown to shield the neurons from oxidative stress by improving mitochondrial function. According to this, successful delivery of Tom40 protein to the brain may lead to a new therapy for neurodegenerative disorders. However, protein delivery to the cell may be difficult. The cells were successfully shielded from hydrogen peroxide-induced oxidative stress by the exosome's Tom40 protein delivery, which we found. This research shows that exosome-mediated Tom40 delivery may be able to restore mitochondrial function and reducing oxidative stress in neurodegenerative diseases, including Alzheimer's and Parkinson's disease.

Source link: https://doi.org/10.1371/journal.pone.0272511


DFT Study of Complexation Reactions Involving Dicarboxylic Acids: Hydrogen Bonds, Influence of Solvent Nature

Quantum chemical experiments of the protolytic capability of some dicarboxylic acids are carried out. The dimerization energies of these substances are determined by considering the basis set superposition error. The HOMO-LUMO energy gap is determined based on the frontier molecular orbitals of the investigated dimeric acids molecules. The obtained values of the energy gaps reveal an increase in the stability of a variety of cyclic compounds derived from the presence of two hydrogen bonds. The ability of the acids to create complexes with the 3,6-di-tert-butyl-oxyphenoxyl semiquinone radical is investigated. Using the CPCM and IEFPCM models, the effect of the solvent's type on the activation barrier of the semiquinone radical u2014 dicarboxylic acid system's complicated reaction is investigated. Using the examples of toluene, tetrahydrofuran, and nitrobenzene, the relationship of the energy parameter on the solvent polarity is established.

Source link: https://doi.org/10.31489/2022Ch2/2-22-21


Performance of coagulation-flocculation followed by ultra-violet/ultrasound activated persulfate/hydrogen peroxide for landfill leachate treatment

The primary treatment, which was previously treated with coagulation-flocculation, by C-F using 20 g. L. 22121 of FeCl3, has reduced 71% of chemical oxidation demand and 95% of turbidity. The oxidation techniques in H2O2-based oxidation reactions were found to be more effective than other methods, indicating that the oxidation devices with H2O2 were more effective than other methods.

Source link: https://doi.org/10.1016/j.sciaf.2022.e01312


Routes to enhanced performance of electrolytic hydrogen evolution reaction over the carbon-encapsulated transition metal alloys

Hydrogen production has revived interest in hydrogen production by water electrolysis, thanks to a steady and steady decrease in the energy cost obtained from renewable sources. Electrolysis for H2 production is now closer to reality than ever before. To solve such constraints, developing low-cost, durable electrolysts as platinum metal is essential to the process's resolution. This study, therefore, is focused more on improving the hydrogen evolution reaction's results.

Source link: https://doi.org/10.5599/jese.1446


How hydrogen sulfide deposition from oil exploitation may affect bacterial communities and the health of forest soils in Congolese coastal plains?

Deposition of hydrogen sulfide deposition in the Congolese coastal plains' acacia and eucalyptus plantations can be highly beneficial to bacterial populations. In stands containing acacia relative to baseline stocks, the increase in carbon and nitrogen stocks has risen. In coarse particulate organic matter in afforested stands, the Phosphorus supply in coarse particulate organic matter also increased as compared to natural savannas. The prevalence of Actinobacteria in all stands has been shown by research of the abundance of bacterial phyla by metabarcoding of the 16S rRNA bacterial gene in various stands of monocultures and mixed-species stands. This research shows how human activities may influence bacterial community composition, which may also alter other soil characteristics. It also acknowledges that forest plantations' longevity on inherently nutrient-poor soils is highly dependent on interactions between soil functions, the environment, and human activities driven by soil organisms.

Source link: https://doi.org/10.3389/fsoil.2022.920142


Climate signals in stable carbon and hydrogen isotopes of lignin methoxy groups from southern German beech trees

Previous research showed that u03b4 2 H LM measurements are also useful for climate reconstructions in temperate environments, where classical tree-ring width and maximum latewood density measurements are less effective for climate reconstructions. We look at the annual deterministic and continental-scale climate data from a temperate site near Hohenpei?u00dfenberg in southern Germany, where we compare these results with regional-to-continental climate measurements. The new u03b4 13 C LM chronologies were then compared to the older trees' u03b4 2 H LM values in order to determine the added benefit of determining past climate variability using a dual-isotope strategy. Our results show that using u03b4 13 C LM values from temperate environments as a predictor of local temperatures and, in conjunction with u03b4 2 H LM values, can be used to measure regional- to sub-continental scale temperature profiles.

Source link: https://doi.org/10.5194/cp-18-1849-2022


Laser excitation of the 1s-hyperfine transition in muonic hydrogen

The CREMA team is investigating a measurement of the ground-state hyperfine splitting in muonic hydrogen with 1 ppm precision by using pulsed laser spectroscopy to determine the two-photon-exchange contribution with 20̆0d710^-4 relative accuracy. The resulting increase in kinetic energy after the collisional deexcitation is used as a characteristic of a fruitful laser transition between hyperfine states. We estimate the likelihood that a 0̆3bc atom initially in the singlet hyperfine state experiences a laser excitation to the triplet state followed by a collision-induced deexcitation back to the singlet state in this paper. This calculation also quantifies one of the key unknowns of the HFS experiment, resulting in a precise definition of the laser system's requirements and an optimization of the hydrogen gas target where 0̆3bc p is established and laser spectroscopy will occur.

Source link: https://doi.org/10.21468/SciPostPhys.13.2.020


Evaluation of an electrochemical biosensor based on carbon nanotubes, hydroxyapatite and horseradish peroxidase for the detection of hydrogen peroxide

An electrochemical biosensor based on glassy carbon electrode was modified with multiwall carbon nanotubes, which in turn were coated with hydroxyapatite and horseradish peroxide for the detection of hydrogen peroxide. For HAp5-fCNT/GC and 2. 93 mmol Lu22121 for HAp20-fCNT/GC, the Michaelis-Menten apparent constant obtained on both sensors was 0. 37 mmol L-u22121 for HAp20-fCNT/GC and 2. 93 mmol L2121 for HAp20-fCNT/GC, indicating that the HRP maintains its enzymatic activity on both electrodes For the HRP/HAp5-fCNT/GC electrode and the HRP/HAp20-fCGC electrode, the linear range was from 1. 0 u22125 M to 2. 34 bcmol Lu22121, with a detection limit of 1. 91 bcmol Lu22121, and 4. 45 u22121 for the HRP/HAp20/GC electrode. The HRP/HAp5-fCNT/GC electrode was used to analyze real-life raw and pasteurized milk samples using the electrode with the highest measurement characteristics, the HRP/HAp5-fCNT/GC electrode.

Source link: https://doi.org/10.1016/j.sbsr.2022.100514

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions