Bibliografias temáticas / Hydrazine oxidation reaction (HHOR)

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Literatura científica selecionada sobre o tema "Hydrazine oxidation reaction (HHOR)"

Autor: Grafiati

Publicado: 29 de março de 2025

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Artigos de revistas sobre o assunto "Hydrazine oxidation reaction (HHOR)"

Yu, Ting, Hu Zhang, Yongzhi Ning, Hongling Li, Ziteng Gao, Bo Wang e Zhijun Cen. "Experimental and Kinetic Simulations of Technetium-Catalyzed Hydrazine Oxidation in Nitric Acid Solution". Processes 12, n.º 11 (23 de outubro de 2024): 2319. http://dx.doi.org/10.3390/pr12112319.

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The catalytic reaction of Tc plays a significant role in the chemical separation process during spent fuel reprocessing. However, few studies have been conducted on the chemical reaction mechanism between Tc and hydrazine. Moreover, the instability of Tc(V) and Tc(VI) makes their measurement difficult, rendering many aspects of the reaction process and mechanism unclear. This study investigates the catalytic reaction between Tc and hydrazine in a nitric acid solution. To this end, we obtained the kinetic laws of the reaction under various conditions of acidity, hydrazine concentration, and Tc concentration by monitoring the concentrations of hydrazine and Tc(VII) over time. The reaction kinetics model demonstrated that numerical simulations could effectively predict the reaction process. Results indicated that hydrazine promotes the reduction of Tc(VII) to Tc(IV), constituting the basis for establishing the Tc(IV, V, VI, VII) catalytic cycle. Among these, Tc(V) and Tc(VI) were important active intermediates and the main consumers of hydrazine. The research results may be useful for actinide separation processes based on valence control.

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Liu, Weiwei, Junfeng Xie, Yanqing Guo, Shanshan Lou, Li Gao e Bo Tang. "Sulfurization-induced edge amorphization in copper–nickel–cobalt layered double hydroxide nanosheets promoting hydrazine electro-oxidation". Journal of Materials Chemistry A 7, n.º 42 (2019): 24437–44. http://dx.doi.org/10.1039/c9ta07857f.

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The electrocatalytic hydrazine oxidation reaction (HzOR) has drawn extensive attention due to its high energy conversion efficiency and wide applications in hydrazine-assisted water splitting and direct hydrazine fuel cells (DHFC).

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Brockmann, Marcela, Freddy Navarro, José Ibarra, Constanza León, Francisco Armijo, María Jesús Aguirre, Galo Ramírez e Roxana Arce. "Effect of the Metal of a Metallic Ionic Liquid (-butyl-methylimidazolium tetrachloroferrate) on the Oxidation of Hydrazine". Catalysts 14, n.º 6 (31 de maio de 2024): 359. http://dx.doi.org/10.3390/catal14060359.

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This work investigates the electrocatalytic properties of carbon paste electrodes (CPEs) modified with ionic liquids (IL) and metallic ionic liquid (ILFe) for the hydrazine oxidation reaction (HzOR). The results indicate that ILFe significantly enhances the catalytic activity of the electrode, exhibiting catalysis towards hydrazine oxidation, reducing overpotential, and increasing reaction current. It is determined that the HzOR on the MWCNT/MO/ILFe electrode involves the transfer of four electrons, with high selectivity for nitrogen formation. Additionally, ILFe is observed to improve the wettability of the electrode surface, increasing its capacitance and reaction efficiency. This study highlights the advantages of ILFe-modified CPEs in terms of simplicity, cost-effectiveness, and improved performance for electrochemical applications, demonstrating how the ionic liquid catalyzes hydrazine oxidation despite its lower conductivity.

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Miao, Ruiyang, e Richard G. Compton. "The Electro-Oxidation of Hydrazine: A Self-Inhibiting Reaction". Journal of Physical Chemistry Letters 12, n.º 6 (5 de fevereiro de 2021): 1601–5. http://dx.doi.org/10.1021/acs.jpclett.1c00070.

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Lee, Hak Hyeon, JI Hoon CHOI, Dong Su Kim e Hyung Koun Cho. "Diffusion-Restricted Cation Exchange Derived Rhodium Nanoparticles for Hydrazine Assisted Hydrogen Production". ECS Meeting Abstracts MA2023-02, n.º 49 (22 de dezembro de 2023): 3222. http://dx.doi.org/10.1149/ma2023-02493222mtgabs.

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Water splitting using renewable energy is a promising hydrogen production method without carbon emission. However, oxygen evolution reaction still suffers from its large overpotential and sluggish kinetics. Thus, alternative oxidation reactions rather than oxygen evolution reaction, such as ammonia, alcohols and hydrazine oxidation reaction are developed for hydrogen production. Rh is one of the most promising catalysts for electrochemical hydrazine splitting that can promote hydrogen evolution reaction on the cathode, which is a much more energy-saving way to generate hydrogen gas than water splitting. Unfortunately, Rh is also one of the most expensive novel metals on the market. Nevertheless, only a few studies have considered the amount of used Rh. In this study, the diffusion-restricted cation exchange (CE) process is suggested as an effective method to reduce the mass of inactive Rh for enhanced mass activity. By immersing the NiOOH substrate in the Rh3+ aqueous solution, Rh3+ atoms are easily exchanged with Ni3+ atoms in the NiOOH lattice on the surface, and the RhOOH forms on the outermost layer. Then, the RhOOH compounds are reduced into metallic rhodium by an electrochemical reduction process, resulting in fine Rh nanoparticles smaller than 2 nm. Due to the suppression of Rh aggregation, a doubled mass activity for electrocatalytic hydrazine oxidation reaction is attained compared to that of conventional electrodeposited Rh catalysts. As a result, the proposed CE-derived Rh catalyst shows stability over 36 hours under the two-electrode hydrazine splitting system.

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Li, Yapeng, Jihua Zhang, Yi Liu, Qizhu Qian, Ziyun Li, Yin Zhu e Genqiang Zhang. "Partially exposed RuP2 surface in hybrid structure endows its bifunctionality for hydrazine oxidation and hydrogen evolution catalysis". Science Advances 6, n.º 44 (outubro de 2020): eabb4197. http://dx.doi.org/10.1126/sciadv.abb4197.

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Replacing the sluggish anode reaction in water electrolysis with thermodynamically favorable hydrazine oxidation could achieve energy-efficient H2 production, while the shortage of bifunctional catalysts limits its scale development. Here, we presented the scalable one-pot synthesis of partially exposed RuP2 nanoparticle–decorated carbon porous microsheets, which can act as the superior bifunctional catalyst outperforming Pt/C for both hydrazine oxidation reaction and hydrogen evolution reaction, where an ultralow working potential of −70 mV and an ultrasmall overpotential of 24 mV for 10 mA cm−2 can be achieved. The two-electrode electrolyzer can reach 10 mA cm−2 with a record-low cell voltage of 23 mV and an ultrahigh current density of 522 mA cm−2 at 1.0 V. The DFT calculations unravel the notability of partial exposure in the hybrid structure, as the exposed Ru atoms are the active sites for hydrazine dehydrogenation, while the C atoms exhibit a more thermoneutral value for H* adsorption.

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Wang, Honglei, e Shengyang Tao. "Fabrication of a porous NiFeP/Ni electrode for highly efficient hydrazine oxidation boosted H2 evolution". Nanoscale Advances 3, n.º 8 (2021): 2280–86. http://dx.doi.org/10.1039/d1na00043h.

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Here, a simple dual-regulation strategy is reported to synthesize porous P-NiFeP/Ni nanoflowers for enabling the anodic hydrazine oxidation reaction and the cathodic energy-saving hydrogen evolution reaction.

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Li, Bin, Kefeng Wang, Jingxiao Ren e Peng Qu. "NiOOH@Cobalt copper carbonate hydroxide nanorods as bifunctional electrocatalysts for highly efficient water and hydrazine oxidation". New Journal of Chemistry 46, n.º 16 (2022): 7615–25. http://dx.doi.org/10.1039/d2nj00518b.

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NiOOH@cobalt copper carbonate hydroxide nanorods demonstrate enhanced electrocatalytic activity toward hydrazine oxidation reaction (HzOR) and oxygen evolution reaction, enabling energy-saving hydrogen production with the assistance of the HzOR.

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Ma, Xiao, Jianmei Wang, Danni Liu, Rongmei Kong, Shuai Hao, Gu Du, Abdullah M. Asiri e Xuping Sun. "Hydrazine-assisted electrolytic hydrogen production: CoS2nanoarray as a superior bifunctional electrocatalyst". New Journal of Chemistry 41, n.º 12 (2017): 4754–57. http://dx.doi.org/10.1039/c7nj00326a.

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A CoS₂nanoarray on Ti mesh acts as an efficient and durable catalyst for the hydrazine oxidation reaction and it only needs 0.81 V to attain 100 mA cm⁻²in 1.0 M KOH with 100 mM hydrazine for its two-electrode electrolyser.

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Shukla, Madhurani, e Kishore K. Tiwari. "A Simple and Low - Cost Spectrophotometric Method for the Determination Of Hydrazine With Methyl Red-iodate System". Journal of Ravishankar University (PART-B) 30, n.º 1 (30 de janeiro de 2021): 01–06. http://dx.doi.org/10.52228/jrub.2017-30-1-1.

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A simple, sensitive and inexpensive spectrophotometric method was developed for the determination of trace amount of hydrazine at microgram level. Hydrazine has been determined by its oxidation to nitrogen by using known excess of potassium iodate. In acidic medium potassium iodate bleaches the methyl red dye. A known excess of potassium iodate was reduced when treated with hydrazine and the unreacted potassium iodate is determined by using methyl red. The method was based on inhibitory effect of hydrazine on the reaction of methyl red dye and potassium iodate in presence of acidic medium. The absorbance of the methyl red after the reaction was monitored spectrophotometrically at 520 nm. The molar absorptivity is calculated to be 3.238×105 L mol-1cm-1. Beer’s law was obeyed over the concentration range of 1-10 µg of hydrazine in an overall aqueous volume of 25 ml with a correlation coeffcient of - 0.999. Sandell’s sensitivity was found to be 0.0004µg cm-2. The optimum reaction conditions like time, temperature, pH, reagent concentration, effect of foreign species etc. have been evaluated for the complete reaction. The developed method can be successfully applied for the determination of trace amount of hydrazine in environmental samples.

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Mais fontes

Teses / dissertações sobre o assunto "Hydrazine oxidation reaction (HHOR)"

Vorms, Evgeniia. "Cinétique de l’oxydation de l’hydrate d’hydrazine et d’autres combustibles sans carbone sur électrode de nickel". Electronic Thesis or Diss., Strasbourg, 2025. http://www.theses.fr/2025STRAF003.

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La production d'énergie électrochimique à partir de combustibles sans carbone a récemment suscité un grand intérêt. Ce manuscrit se concentre sur l'étude du mécanisme de la réaction d'oxydation de l'hydrazine (HHOR) sur des électrodes de Ni et le compare avec ceux des réactions d'oxydation du borohydrure et de l’ammoniac-borane (BOR, ABOR). Les sites métalliques de Ni ont été identifiés comme les sites catalytiques pour la HHOR, la BOR et l'ABOR, tandis que la présence de sites de Ni (hydr)oxydés a un effet négatif sur l'activité sans influencer clairement le mécanisme réactionnel. Sur la base des résultats de calculs DFT, de la modélisation microcinétique et de mesures DEMS en ligne, un mécanisme de la HHOR sur Ni a été proposé. Celui-ci implique la réaction directe de l'hydrazine dissoute avec des espèces Ni-OH adsorbées, formant un intermédiaire N2Hx,ad (x<4), qui est ensuite oxydé électrochimiquement, conduisant à la formation de N2 et d’eau
Electrochemical energy production from carbon-free fuels has recently attracted much attention. This manuscript focuses on studying the mechanism of the hydrazine oxidation reaction (HHOR) on Ni electrodes and comparing it with the ones of the borohydride and ammonia-borane oxidation reactions (BOR, ABOR). Metallic Ni sites were identified as the catalytic sites for the HHOR, BOR, and ABOR, while the presence of Ni (hydr)oxide sites was found to negatively affect activity without a clear influence on the reaction mechanism. Based on the results of DFT calculations, microkinetic modelling, and online DEMS measurements, a mechanism for HHOR on Ni was proposed. It involves the direct reaction of dissolved hydrazine with adsorbed Ni-OH species forming N2Hx,ad (x<4) intermediate, which is subsequently electrochemically oxidized, leading to the formation of N2 and water

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Capítulos de livros sobre o assunto "Hydrazine oxidation reaction (HHOR)"

Bailey, Patrick D., e Keith M. Morgan. "Oximes". In Organonitrogen Chemistry. Oxford University Press, 2022. http://dx.doi.org/10.1093/hesc/9780198557753.003.0014.

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This chapter discusses the synthesis and properties of compounds with N-N bonds. It looks into the synthesis and reaction of hydrazines, hydrazides, hydrazones, diazo compounds, and azides. The N-N-containing functional groups undergo vital interconversions which have great synthetic value. Additionally, the chapter explains how alkyl hydrazines are usually made from suitable alkyl halide and hydrazine. Also, hydrazones are prepared from the reaction of aldehydes and ketones with hydrazines, while oxidation of some hydrazines will result in the formation of diazo compounds. Alkyl azides are prepared via the nucleophilic attack of sodium azide on a suitable alkyl compound such as halide or sulphonate.

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Choubey, Jyotsna, Jyoti Kant Choudhari, J. Anandkumar, Mukesh Kumar Verma, Tanushree Chaterjee e Biju Prava Sahariah. "Cell Biology, Biochemistry and Metabolism of Unique Anammox Bacteria". In Ammonia Oxidizing Bacteria, 147–57. Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781837671960-00147.

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Anaerobic ammonium oxidation (anammox) bacteria oxidize ammonium in the absence of oxygen with NO2 as the oxidant instead of oxygen and form dinitrogen (N2) as the end product. Anammox bacteria belong to the phylum Planctomycetes. Anammox bacteria are characterized by a compartmentalized cell architecture featuring a central cell compartment, the “anammoxosome”. This organelle is surrounded by ladderane lipids, which make the organelle nearly impermeable to hydrazine and protons. Anammox bacteria show similarities to both Archaea and Eukarya, making them extremely interesting from a cell biological perspective. Anammox metabolism takes place in a special and unique cell organelle, the anammoxosome. Here, energy released in the anammox reaction is used to generate proton-motive force that drives ATP synthesis. This respiratory process is supported by novel membrane-bound protein complexes. On a global scale, anammox bacteria significantly contribute to the removal of fixed nitrogen from the environment and the process is finding rapidly increasing interest in wastewater treatment. This chapter highlights the current knowledge on the cell biology, biochemistry and metabolism of this unique group of bacteria.

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