Hydrogen evolution

Ebook "Copper and bacteria: Evolution, homeostasis and toxicity" summarizes the current knowledge of copper toxicity, homeostasis and resistance in bacteria, in which proteins like copper ATPases, copper chaperones and copper-responsive regulators of gene expression play major roles. The author also discusses the metallation of cuproenzymes. The evolution of the use of copper by cells and of copper-homeostatic proteins are is also considered in this brief.

99p tracanhphuonghoa1007 22-04-2024 2 2   Download

Ebook "Chalcogenide materials for energy conversion: Pathways to oxygen and hydrogen reactions" addresses electrocatalysis based on chalcogenides, particularly in the nanoscale domain. Special attention is paid to the hydrogen evolution reaction (HER) and the oxygen reduction reaction (ORR). The book provides an introduction to materials synthesis; the basic principles of electrocatalysis; related precious metal versus non-precious metal catalytic center chalcogenides as well as supports; and the role of such supports in stabilizing the catalytic centers.

234p tracanhphuonghoa1007 22-04-2024 7 3   Download

Ebook "(Endo)symbiotic methanogenic archaea" updated monograph deals with methanogenic endosymbionts of anaerobic protists, in particular ciliates and termite flagellates, and with methanogens in the gastrointestinal tracts of vertebrates and arthropods. Further chapters discuss the genomic consequences of living together in symbiotic associations, the role of methanogens in syntrophic degradation, and the function and evolution of hydrogenosomes, hydrogen-producing organelles of certain anaerobic protists.

245p tachieuhoa 28-01-2024 4 2   Download

Cellulose nanowhiskers (CNW) from cotton, was prepared by acid hydrolysis and purified using a size selection process to obtain homogeneous samples with average particle size of 270 nm and 85.5% crystallinity. Purified CNW was used as precursor to carbon nanoneedles (CNN) synthesis.

7p vihermione 06-01-2023 12 2   Download

Cathodic polarization is investigated as a technique for CRUD build-up mitigation in simulated primary pressurized water reactor conditions and accelerated flow. This investigation showed that the application of 3 V could induce a 67% reduction in surface deposition whilst 30 V cell voltage completely prevented the formation of surface deposits.

6p vironald 15-12-2022 8 3   Download

The present work describes the preparation of new thiadiazoles through a simple intramolecular reaction of mono- and bis-hydrazonoyl halides with methyl hydrogen phenyl carbonimidodithioate or methyl-2-arylidene hydrazinecarbodithioate. The synthetic method involves nucleophilic substitution followed by intramolecular cyclization reactions mediated by evolution of methanethiol. The structures of the title compounds were elucidated by elemental analyses, and FTIR, MS and NMR spectra.

8p langthannam 29-12-2021 8 0   Download

The optimum growth time was acquired to be 11 hours. Thereby such obtained electrode exhibited the maximum HER activity with onset over the potential of 220 mV versus reversible hydrogen electrode (RHE), and the Tafel slope of 66 mV per decade (mV/dec). Conclusion: Our results suggest a good technique for the research of high-efficient HER electrocatalyst based on atomicthickness layered materials.

7p spiritedaway36 28-11-2021 3 1   Download

Fabbrication of electrocatalyst materials on the IrO2 basis for oxygen evolution reaction in proton exchange membrane water electrolyser PEMWE; applying to fabbricated proton exchange membrane water electrolyser PEMWE to produce hydrogen.

26p larachdumlanat129 20-01-2021 22 5   Download

Electrochemical hydrogen evolution reaction (HER) using non- precious comp ounds has gained substantia l interest in the development of water electrolyzers. Herein, we report the synthesis of Copper sulfide (Cu2S) micro-hexagons via a hydrothermal method, followed by some of the important physiochemical characterizations and electrochemical measurements towards the HER.

7p larachdumlanat129 14-01-2021 5 2   Download

This paper study the coherent Stokes generation in a transient stimulated Raman scattering regime by Hydrogen gas-filled hollow-core photonic crystal fibres configuration. The temporal and spatial evolution of the pump and Stokes field envelopes as well as the coherence and population inversion are numerically calculated. The Stokes generation efficiency and the influence of pump pulse width and gas pressure on the energy exchange along fibre are investigated.

8p nguyenxuankha_bevandan 14-08-2020 11 1   Download

Amorphous molybdenum sulfide (MoSx) is a highly active noble-metal-free electrocatalysis for the hydrogen evolution reaction (HER). The MoSx was prepared by electrochemical deposition at room temperature. Low-cost precursors of Mo and S were adopted to synthesize thiomolybdates solution as the electrolyte.

9p vijiraiya2711 27-05-2020 9 0   Download

Amorphous molybdenum sulfide (MoSx ) is an attractive Pt-free catalyst for the hydrogen evolution reaction (HER) in both neutral and acidic pH electrolytes. Among the available approaches for the preparation of MoSx , the electrochemical oxidation and reduction of a tetrathiomolybdate salt ([MoS4 ] 2-) represents the most convenient. Herein we describe new insights onto the electrochemical oxidation of [MoS4 ]2- to grow MoSx thin films by employing an advanced technique called electrochemical quartz crystal microbalance (EQCM).

5p chauchaungayxua2 07-01-2020 19 0   Download

Three-phase fixed-bed reactors are very often encountered in industrial applica- tions for carrying out different chemical reactions between gaseous and liquid reactants on porous catalysts, in processes such as, hydrogenation, hydrotreating, purification, the Fischer–Tropsch synthesis, and in many others. These processes form the basis for production of a large variety of intermediate and ultimate products in refinery, bulk and fine chemistry, in manufacture of monomers, sol- vents, pharmaceuticals, fragrances, fuels, food additives, etc....

115p namde01 11-04-2013 53 7   Download

Water is necessary both for the evolution of life and its continuance. It possesses particular properties that cannot be found in other materials and that are required for lifegiving processes. These properties are brought about by the hydrogen bonded environment particularly evident in liquid water. Each liquid water molecule is involved in about four hydrogen bonds with strengths considerably less than covalent bonds but considerably greater than the natural thermal energy.

20p taisaocothedung 12-01-2013 53 1   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Facile Hydrogen Evolution Reaction on WO3 Nanorods Janarthanan Rajeswari Æ Pilli Satyananda Kishore Æ Balasubramanian Viswanathan Æ Thirukkallam Kanthadai Varadarajan

8p sting10 07-03-2012 27 3   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Solar light-driven photocatalytic hydrogen evolution over ZnIn2S4 loaded with transition-metal sulfides

6p dauphong13 09-02-2012 43 3   Download

Abstract Red mud is a residue in the production of alumina by the Bayer process. It contains oxides of iron and titanium, and has been shown to be active in sulfided form as hydrogenation catalyst. The evolution of sulfided red mud activity and selectivity with reaction time was studied for the hydrogenation of a light fraction of an anthracene oil.

15p tudoia 06-04-2011 92 11   Download

Introduction: The evolution of hydrogen gas at the cathode is one of the reactions most frequently occurring in industrial cells. Besides the obvious case of water electrolyzers, hydrogen evolution occurs at the cathode of chlor-alkali and chlorate cells, which are among the most intensive electrochemical processes. On the other hand, hydrogen liberation is the cathodic process in cells containing aqueous solutions or protonated solvents where the wanted reaction takes place at the anode.

8p congdat261 06-12-2010 76 13   Download

Introduction In 1791, the first combination of metals in Volta’s battery involved zinc as the negative electrode. A zinc electrode was also used in subsequent Daniell, Grove, and Bunsen cells developed in the early nineteenth century. Those cells were strictly powered by zinc dissolution and cathodic hydrogen evolution.

10p congdat261 02-12-2010 98 11   Download

In the past several years, there have been many developments in the materials for lead–acid batteries. Silver in grid alloys for high temperature climates in SLI batteries has increased the silver content of the recycled lead stream. Concern about silver and other contaminants in lead for the active material for VRLA batteries led to the initiation of a study by ALABC at CSIRO. The study evaluated the effects of many different impurities on the hydrogen and oxygen evolution currents in float service for flooded and VRLA batteries at different temperatures and potentials. ...

12p congdat261 19-11-2010 116 11   Download