Relevant bibliographies by topics / Hydrogen

Academic literature on the topic 'Hydrogen'

Author: Grafiati
Published: 4 June 2021
Last updated: 30 July 2024

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Journal articles on the topic "Hydrogen"

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Wang, Xinyu, Huiyuan Wang, Hongmin Zhang, Tianxi Yang, Bin Zhao, and Juan Yan. "Investigation of the Impact of Hydrogen Bonding Degree in Long Single-Stranded DNA (ssDNA) Generated with Dual Rolling Circle Amplification (RCA) on the Preparation and Performance of DNA Hydrogels." Biosensors 13, no. 7 (July 23, 2023): 755. http://dx.doi.org/10.3390/bios13070755.

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DNA hydrogels have gained significant attention in recent years as one of the most promising functional polymer materials. To broaden their applications, it is critical to develop efficient methods for the preparation of bulk-scale DNA hydrogels with adjustable mechanical properties. Herein, we introduce a straightforward and efficient molecular design approach to producing physically pure DNA hydrogel and controlling its mechanical properties by adjusting the degree of hydrogen bonding in ultralong single-stranded DNA (ssDNA) precursors, which were generated using a dual rolling circle amplification (RCA)-based strategy. The effect of hydrogen bonding degree on the performance of DNA hydrogels was thoroughly investigated by analyzing the preparation process, morphology, rheology, microstructure, and entrapment efficiency of the hydrogels for Au nanoparticles (AuNPs)–BSA. Our results demonstrate that DNA hydrogels can be formed at 25 °C with simple vortex mixing in less than 10 s. The experimental results also indicate that a higher degree of hydrogen bonding in the precursor DNA resulted in stronger internal interaction forces, a more complex internal network of the hydrogel, a denser hydrogel, improved mechanical properties, and enhanced entrapment efficiency. This study intuitively demonstrates the effect of hydrogen bonding on the preparation and properties of DNA hydrogels. The method and results presented in this study are of great significance for improving the synthesis efficiency and economy of DNA hydrogels, enhancing and adjusting the overall quality and performance of the hydrogel, and expanding the application field of DNA hydrogels.
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Li, Zhangkang, Cheng Yu, Hitendra Kumar, Xiao He, Qingye Lu, Huiyu Bai, Keekyoung Kim, and Jinguang Hu. "The Effect of Crosslinking Degree of Hydrogels on Hydrogel Adhesion." Gels 8, no. 10 (October 21, 2022): 682. http://dx.doi.org/10.3390/gels8100682.

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The development of adhesive hydrogel materials has brought numerous advances to biomedical engineering. Hydrogel adhesion has drawn much attention in research and applications. In this paper, the study of hydrogel adhesion is no longer limited to the surface of hydrogels. Here, the effect of the internal crosslinking degree of hydrogels prepared by different methods on hydrogel adhesion was explored to find the generality. The results show that with the increase in crosslinking degree, the hydrogel adhesion decreased significantly due to the limitation of segment mobility. Moreover, two simple strategies to improve hydrogel adhesion generated by hydrogen bonding were proposed. One was to keep the functional groups used for hydrogel adhesion and the other was to enhance the flexibility of polymer chains that make up hydrogels. We hope this study can provide another approach for improving the hydrogel adhesion generated by hydrogen bonding.
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Jiang, Zhiqiang, Ya Li, Yirui Shen, Jian Yang, Zongyong Zhang, Yujing You, Zhongda Lv, and Lihui Yao. "Robust Hydrogel Adhesive with Dual Hydrogen Bond Networks." Molecules 26, no. 9 (May 4, 2021): 2688. http://dx.doi.org/10.3390/molecules26092688.

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Hydrogel adhesives are attractive for applications in intelligent soft materials and tissue engineering, but conventional hydrogels usually have poor adhesion. In this study, we designed a strategy to synthesize a novel adhesive with a thin hydrogel adhesive layer integrated on a tough substrate hydrogel. The adhesive layer with positive charges of ammonium groups on the polymer backbones strongly bonds to a wide range of nonporous materials’ surfaces. The substrate layer with a dual hydrogen bond system consists of (i) weak hydrogen bonds between N,N-dimethyl acrylamide (DMAA) and acrylic acid (AAc) units and (ii) strong multiple hydrogen bonds between 2-ureido-4[1H]-pyrimidinone (UPy) units. The dual hydrogen-bond network endowed the hydrogel adhesives with unique mechanical properties, e.g., toughness, highly stretchability, and insensitivity to notches. The hydrogel adhesion to four types of materials like glass, 316L stainless steel, aluminum, Al2O3 ceramic, and two biological tissues including pig skin and pig kidney was investigated. The hydrogel bonds strongly to dry solid surfaces and wet tissue, which is promising for biomedical applications.
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Dai, Bailin, Ting Cui, Yue Xu, Shaoji Wu, Youwei Li, Wu Wang, Sihua Liu, Jianxin Tang, and Li Tang. "Smart Antifreeze Hydrogels with Abundant Hydrogen Bonding for Conductive Flexible Sensors." Gels 8, no. 6 (June 13, 2022): 374. http://dx.doi.org/10.3390/gels8060374.

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Recently, flexible sensors based on conductive hydrogels have been widely used in human health monitoring, human movement detection and soft robotics due to their excellent flexibility, high water content, good biocompatibility. However, traditional conductive hydrogels tend to freeze and lose their flexibility at low temperature, which greatly limits their application in a low temperature environment. Herein, according to the mechanism that multi−hydrogen bonds can inhibit ice crystal formation by forming hydrogen bonds with water molecules, we used butanediol (BD) and N−hydroxyethyl acrylamide (HEAA) monomer with a multi−hydrogen bond structure to construct LiCl/p(HEAA−co−BD) conductive hydrogel with antifreeze property. The results indicated that the prepared LiCl/p(HEAA−co−BD) conductive hydrogel showed excellent antifreeze property with a low freeze point of −85.6 °C. Therefore, even at −40 °C, the hydrogel can still stretch up to 400% with a tensile stress of ~450 KPa. Moreover, the hydrogel exhibited repeatable adhesion property (~30 KPa), which was attributed to the existence of multiple hydrogen bonds. Furthermore, a simple flexible sensor was fabricated by using LiCl/p(HEAA−co−BD) conductive hydrogel to detect compression and stretching responses. The sensor had excellent sensitivity and could monitor human body movement.
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Skopinska-Wisniewska, Joanna, Silvia De la Flor, and Justyna Kozlowska. "From Supramolecular Hydrogels to Multifunctional Carriers for Biologically Active Substances." International Journal of Molecular Sciences 22, no. 14 (July 9, 2021): 7402. http://dx.doi.org/10.3390/ijms22147402.

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Supramolecular hydrogels are 3D, elastic, water-swelled materials that are held together by reversible, non-covalent interactions, such as hydrogen bonds, hydrophobic, ionic, host–guest interactions, and metal–ligand coordination. These interactions determine the hydrogels’ unique properties: mechanical strength; stretchability; injectability; ability to self-heal; shear-thinning; and sensitivity to stimuli, e.g., pH, temperature, the presence of ions, and other chemical substances. For this reason, supramolecular hydrogels have attracted considerable attention as carriers for active substance delivery systems. In this paper, we focused on the various types of non-covalent interactions. The hydrogen bonds, hydrophobic, ionic, coordination, and host–guest interactions between hydrogel components have been described. We also provided an overview of the recent studies on supramolecular hydrogel applications, such as cancer therapy, anti-inflammatory gels, antimicrobial activity, controlled gene drug delivery, and tissue engineering.
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Fan, Xiangchao, Zhaojun Chen, Haotian Sun, Sijia Zeng, Ruonan Liu, and Ye Tian. "Polyelectrolyte-based conductive hydrogels: from theory to applications." Soft Science 2, no. 3 (2022): 10. http://dx.doi.org/10.20517/ss.2022.09.

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With the continuous development of soft conductive materials, polyelectrolyte-based conductive hydrogels have gradually become a major research hotspot because of their strong application potential. This review first considers the basic conductive theory of hydrogels, which can be divided into the hydrogel structure and zwitterionic enhancing conductivity theories. We then classify polyelectrolyte-based conductive hydrogels into different types, including double, ionic-hydrogen bond, hydrogen bond，and physically crosslinked networks. Furthermore, the mechanical, electrical, and self-healing properties and fatigue and temperature interference resistance of polyelectrolyte-based conductive hydrogels are described in detail. We then discuss their versatile applications in strain sensors, solid-state supercapacitors, visual displays, wound dressings, and drug delivery. Finally, we offer perspectives on future research trends for polyelectrolyte-based conductive hydrogels.
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Cai, Hao-Kun, Zhong-Yi Jiang, Siyuan Xu, Ying Xu, Ping Lu, and Jian Dong. "Polymer Hydrogel Supported Ni/Pd Alloys for Hydrogen Gas Production from Hydrolysis of Dimethylamine Borane with a Long Recyclable Lifetime." Polymers 14, no. 21 (November 1, 2022): 4647. http://dx.doi.org/10.3390/polym14214647.

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Hydrogen gas production can be produced from dimethylamine borane by the catalytic effect of metal nanoparticles. Past research efforts were heavily focused on dehydrogenation in organic solvents. In this study, hydrolysis of the borane in aqueous solutions was investigated, which bears two significant advantages: that two-thirds of the hydrogen generated originate from water and that the hydrogen storage materials are non-flammable. Polymer hydrogels serve as good carriers for metal particles as catalysts in aqueous solutions. Kinetic analysis of hydrogen production was performed for Ni/Pd bimetallic nanoclusters dispersed in a polymer hydrogel with a 3-D network structure. The reaction catalyzed by the bimetallic nanoclusters has an activation energy of only 34.95 kJ/mol, considerably lower than that by Ni or other metal catalysts reported. A significant synergistic effect was observed in the Ni/Pd bimetallic catalysts (Ni–Pd = 20/1) with a higher activity than Pd or Ni alone. This proves the alloy nature of the nanoparticles in the borane hydrolysis and the activation of water and borane by both metals to break the O–H and B–H bonds. The hydrogel with the Ni/Pd metal can be recycled with a much longer lifetime than all the previously prepared catalysts. The aqueous borane solutions with a polymer hydrogel can become a more sustainable hydrogen supplier for long-term use.
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Mucaria, Angelica, Demetra Giuri, Claudia Tomasini, Giuseppe Falini, and Devis Montroni. "Tunable Oxidized-Chitin Hydrogels with Customizable Mechanical Properties by Metal or Hydrogen Ion Exposure." Marine Drugs 22, no. 4 (April 3, 2024): 164. http://dx.doi.org/10.3390/md22040164.

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This study focuses on the optimization of chitin oxidation in C6 to carboxylic acid and its use to obtain a hydrogel with tunable resistance. After the optimization, water-soluble crystalline β-chitin fibrils (β-chitOx) with a degree of functionalization of 10% were obtained. Diverse reaction conditions were also tested for α-chitin, which showed a lower reactivity and a slower reaction kinetic. After that, a set of hydrogels was synthesized from β-chitOx 1 wt.% at pH 9, inducing the gelation by sonication. These hydrogels were exposed to different environments, such as different amounts of Ca2+, Na+ or Mg2+ solutions, buffered environments such as pH 9, PBS, pH 5, and pH 1, and pure water. These hydrogels were characterized using rheology, XRPD, SEM, and FT-IR. The notable feature of these hydrogels is their ability to be strengthened through cation chelation, being metal cations or hydrogen ions, with a five- to tenfold increase in their storage modulus (G’). The ions were theorized to alter the hydrogen-bonding network of the polymer and intercalate in chitin’s crystal structure along the a-axis. On the other hand, the hydrogel dissolved at pH 9 and pure water. These bio-based tunable hydrogels represent an intriguing material suitable for biomedical applications.
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Jiang, Weihui, Peiyao Shen, and Ju Gu. "Nanocrystalline cellulose prepared by double oxidation as reinforcement in polyvinyl alcohol hydrogels." Journal of Polymer Engineering 40, no. 1 (December 18, 2019): 67–74. http://dx.doi.org/10.1515/polyeng-2019-0258.

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Abstract As a biopolymer with high mechanical strength, nanocellulose was increasingly studied to improve polymer properties. In this study, nanocrystalline cellulose (NCC) was efficiently isolated from eucalyptus pulp by double oxidation (ammonium persulfate oxidation and ultrasonic oxidation). The total yield of NCC (405.1 ± 180.5 nm long and 31.7 ± 9.5 nm wide) was 38.3%. A novel hybrid hydrogel was produced from polyvinyl alcohol (PVA) and NCC using the freeze-thaw technique. In this hybrid architecture, hydrogen bonds were formed between PVA and NCC. With the increasing proportion of NCC, the pore size of hydrogels shank gradually and the structure of the hybrid hydrogels became denser. The tensile strength of PVA/NCC hybrid hydrogels increased by 42.4% compared to the neat PVA hydrogel. The results showed that NCC can improve the swelling, thermal properties, and water evaporation rate of PVA hydrogels due to the hydrophilic hydroxyl groups of NCC and hydrogen bonds between PVA and NCC, indicating that PVA hydrogels would have a wider range of application due to the existence of NCC, a green hybrid filler. Most importantly, this novel double oxidation method for preparing nanocellulose will promote an efficient production of nanocellulose.
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Wei, Shih-Yen, Tzu-Hsuan Chen, Feng-Sheng Kao, Yi-Jung Hsu, and Ying-Chieh Chen. "Strategy for improving cell-mediated vascularized soft tissue formation in a hydrogen peroxide-triggered chemically-crosslinked hydrogel." Journal of Tissue Engineering 13 (January 2022): 204173142210840. http://dx.doi.org/10.1177/20417314221084096.

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The physically-crosslinked collagen hydrogels can provide suitable microenvironments for cell-based functional vascular network formation due to their biodegradability, biocompatibility, and good diffusion properties. However, encapsulation of cells into collagen hydrogels results in extensive contraction and rapid degradation of hydrogels, an effect known from their utilization as a pre-vascularized graft in vivo. Various types of chemically-crosslinked collagen-based hydrogels have been successfully synthesized to decrease volume contraction, retard the degradation rate, and increase mechanical tunability. However, these hydrogels failed to form vascularized tissues with uniformly distributed microvessels in vivo. Here, the enzymatically chemically-crosslinked collagen-Phenolic hydrogel was used as a model to determine and overcome the difficulties in engineering vascular networks. Results showed that a longer duration of inflammation and excessive levels of hydrogen peroxide limited the capability for blood vessel forming cells-mediated vasculature formation in vivo. Lowering the unreacted amount of crosslinkers reduced the densities of infiltrating host myeloid cells by half on days 2–4 after implantation, but blood vessels remained at low density and were mainly located on the edge of the implanted constructs. Co-implantation of a designed spacer with cell-laden hydrogel maintained the structural integrity of the hydrogel and increased the degree of hypoxia in embedded cells. These effects resulted in a two-fold increase in the density of perfused blood vessels in the hydrogel. Results agreed with computer-based simulations. Collectively, our findings suggest that simultaneous reduction of the crosslinker-induced host immune response and increase in hypoxia in hydrogen peroxide-triggered chemically-crosslinked hydrogels can effectively improve the formation of cell-mediated functional vascular networks.
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Dissertations / Theses on the topic "Hydrogen"

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Samanta, C. "Direct oxidation of hydrogen to hydrogen peroxide." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2004. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2423.

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Östersjö, Victor. "Supersymmetry for the Hydrogen Atom." Thesis, Karlstads universitet, Institutionen för ingenjörsvetenskap och fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-35397.

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In this thesis it will be shown that the hydrogen atom has a SU(2) × SU(2) symmetry generated by the quantum mechanical angular momentum and Runge-Lenz vector operators. Additionally, the hydrogenic atom will be studied with supersymmetric methods to identify a supersymmetry that relates different such systems. This thesis is intended to present the material in a manner accessible to people without background in Lie groups and supersymmetry, as well as fill in some calculations between steps that are not spelt out in the litterature.
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Schmidtmann, Marc. "Hydrogen transfer in hydrogen bonded solid state materials." Thesis, Connect to e-thesis, 2008. http://theses.gla.ac.uk/284/.

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Thesis (Ph.D.) - University of Glasgow, 2008.
Ph.D. thesis submitted to the Department of Chemistry, Faculty of Physical Sciences, University of Glasgow, 2008. Includes bibliographical references. Print version also available.
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Stapf, Stefanie [Verfasser], Nicolas [Gutachter] Plumeré, and Wolfgang [Gutachter] Schuhmann. "Viologen polymers for reversible hydrogen oxidation and hydrogen generation in redox hydrogels / Stefanie Stapf ; Gutachter: Nicolas Plumeré, Wolfgang Schuhmann." Bochum : Ruhr-Universität Bochum, 2017. http://d-nb.info/1144614406/34.

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Whittaker, Alexander. "Hydrogen future." Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-10420.

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Hydrogen electrolysis has gone through a number of stages in research and applications. From what we can see from this report, there are several ways of producing hydrogen electrolysis, and several applications. The main purposes of this report however, is not to describe what hydrogen electrolysis is and its applications. Research and experiments has already proven that it is a functioning technology. The aim is to gather the necessary information, both theoretically and practically to be able, from a technical and business point of view analyze if this in fact is a realistic solution. To maintain a system of sustainable energy has always been an attractive market and there has existed a number of technologies that has had their share of the fame. However, most of these solutions have shown not to be viable, lucrative or technically scalable. Hence, the important issue to address is whether this is a solution worth investing in. The information gathered for the theory is based on technical reports, academic scripture and literature. All of which can be back tracked to its original source. The practical test is done by using a test kit made for universities and other institutes to better understand how hydrogen electrolysis works. The materials used are all scientifically acceptable according to the theories and technologies surrounding hydrogen electrolysis. Hence, the data gathered from the test kits are all accurate according to current research.
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Кравченко, Наталія Олександрівна, Наталия Александровна Кравченко, Nataliia Oleksandrivna Kravchenko, and R. Lopatka. "Hydrogen Energy." Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/13492.

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Hydrogen is the simplest element. An atom of hydrogen consists of only one proton and one electron. It's also the most plentiful element in the universe. Despite its simplicity and abundance, hydrogen doesn't occur naturally as a gas on the Earth - it's always combined with other elements. Water, for example, is a combination of hydrogen and oxygen (H2O). When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/13492
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Lusson, Salomé. "Hydrogen liquefaction chain: co-product hydrogen and upstream study." Thesis, KTH, Kemiteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-290940.

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The European Green Deal declared that Europe must decarbonize to become carbon-neutral within 2050. To do so, the European Parliament emphasized hydrogen as a major tool for energy transition. In regard of current environmental challenges, liquid hydrogen has raised interest as energy carrier for energy storage and transport. Due to growing use of renewable energy sources such as solar and wind energy, intermittent sources will increase. Hydrogen production methods will become mostly intermittent with renewable energies. However, due to historical hydrogen production by steam methane reforming, liquefaction was developed at steady nominal charge. In order to feed current liquefaction processes with renewable hydrogen, a buffer system will become required. This thesis studies the effect of buffer and liquefaction combination on performances and cost. In order to carry out this liquefaction from intermittent source, the study is performed based on industrial data from a variable co-product hydrogen profile. This profile acts as a simplified case. The scope of the study is drawn by considering compressed hydrogen as temporary storage for the buffer while liquefaction unit is modelled around Linde Leuna cycle. The technical-economical study covers sensitivity analysis on both buffer and liquefaction unit. For the buffer unit, storage capacity, storage pressure, liquefaction flexibility and recuperation rate impacts are examined. Liquefaction sensitivity analysis includes pressure drop, electricity cost and capacity study.  It is highlighted that 100% gaseous hydrogen recovery is not profitable due to high costs increase for recuperation higher than 95%. Storage pressure and capacity as well as liquefaction flexibility drive buffer cost and recuperation rate of the co-product hydrogen. Considering liquefaction study, results highlight that pressure drops cause first order deviations in energy consumption as well as on cost. Results show that the specific buffer cost is evaluated between 71% and 59% of liquefaction cost. Hence the thesis raises attention on future work on heat exchangers design, pressure drop optimization and liquefaction unit flexibility to allow an optimized renewable liquid hydrogen production.
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Chen, Guo Fu. "The diffusion of muonic hydrogen atoms in hydrogen gas." W&M ScholarWorks, 1990. https://scholarworks.wm.edu/etd/1539623790.

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This experiment measured the time distribution of muonic hydrogen atoms which were formed when negative muons were brought to rest in H{dollar}\sb2{dollar} gas, containing Au target foils, at five pressures (750 mbar, 375 mbar, 188 mbar, 94 mbar and 47 mbar at 4.6 mm foil spacing). A Monte Carlo method is applied for deducing the initial velocity distribution, and preliminary results are obtained. The initial velocity distribution of {dollar}\mu{dollar}H atoms is reasonably well described as a 'Maxwellian' velocity distribution with a mean energy E = 3.4 eV. The corresponding muon mean capture energy is obtained: E{dollar}\sb{lcub}\rm c{rcub}{dollar} {dollar}\approx{dollar} 34 eV for {dollar}\mu{dollar}H atom and E{dollar}\sb{lcub}\rm c{rcub}{dollar} {dollar}\approx{dollar} 68 eV for {dollar}\mu{dollar}H{dollar}\sb2{dollar} molecules. We also find the negative muon capture energy distribution is exponential.;In addition, a significant improvement of the negative muon mean life {dollar}\tau{dollar} in Au is abtained in this experiment.: {dollar}\tau\sb{lcub}\rm Au{rcub}{dollar} = 69.716 {dollar}\pm{dollar} 0.144 ns. The "full decay curve fitting method" which we use in this experiment has an advantage over the previous method in three aspects: (1) We have measured the mean life and determined the time resolution {dollar}\sigma{dollar}(E) of a detector at a particular energy level; (2) We have determined the effective zero time of the decay curve; (3) We have provided a possible way to measure the mean life {dollar}\tau{dollar} when {dollar}\tau{dollar} is less than the time resolution {dollar}\sigma{dollar}(E) of the detector ({dollar}\tau{dollar} {dollar}<{dollar} {dollar}\sigma{dollar}(E)).
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Castillo, Moreno Patricia. "Développement d'un procédé de production d'hydrogène photofermentaire à partir de lactosérum." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI029/document.

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L'hydrogène est une source d'énergie précieuse en tant que source d'énergie propre et que matière première pour des innombrables industries.Les procédés biologiques de production d'hydrogène gagnent en importance en raison de leurs avantages opérationnelles et de leur polyvalence dans les substrats utilisés (y compris les eaux usées).Dans cette thèse doctoral, on a développé une méthodologie photo-fermentative de production d'hydrogène en utilisant du lactosérum en tant que substrat pour la bactérie Rhodobacter capsulatus IR3::LacZ et B10::LacZ.Ce projet a été réalisé en trois étapes, exposées dans les différents chapitres.Dans la première étape on a identifié les facteurs pertinents pour la production de l'hydrogène avec du sérum synthétique en utilisant la méthodologie de plan d'expériences.Les résultats de cet étape on a obtenu quatre modèles statistiques et on a choisi la souche IR3::LacZ pour les expériences avec du lactosérum industriel.Le rendement volumétrique maximal et le rendement produit / substrat Y P/S obtenus pour la première étape ont été de 64 ml h-1L-1 et 2,08 mol H2 mol-1 C (“C” représente la source de carbone dans ce cas lactose et lactate) pour la solution amortissant le phosphate et 43.01 ml h-1L-1 y 2.52 mol H2 mol-1 C pour la solution Kolthoff.Dans la deuxième étape, on a évalué la production d'hydrogène avec du lactosérum industriel. On a appliqué un pré-traitement de trois étapes avant d'utiliser le lactosérum comme substrat : réduction du contenu gras, déprotéinisation et stérilisation. On a obtenu un modèle validé qui décrit la production d'hydrogène seulement pour la solution amortissant de phosphate. Le rendement volumétrique maximal et le YP/S ont été de 45.93 ml h-1L-1 et de 2.29 mol H2 mol-1 C respectivement. On a déterminé que l'addition d'une étape d’homo-fermentation au processus de prétraitement es avantageuse au rendement du processus. On a obtenu une productivité volumétrique de 69.71 ml h-1L-1 et de YP/S de 2.96 mol H2 mol-1 CLa troisième étape a été la mise à l'échelle des expériences à réacteurs de 1,5 L pour sérum synthétique et de 1L pour serum industriel. On a décelé de la contamination dû à la présence d'un processus de fermentation, lequel a généré une haute production de biogas composé exclusivement par H2 y CO2 ce dernier dans une concentration non superieur à 30% (v/v).Pour ces raisons, on a conclu que conclu que le processus de production intégré, en couplant la fermentation obscure et la photo-fermentation est une option avec un énorme potentiel pour l'utilisation de lactosérum comme substrat dans la production d'hydrogène
Hydrogen is a valuable gas use as a clean energy source and feedstock for some industries. Biological hydrogen production processes are gaining importance due to their operational conditions and versatility in the substrates (including wastewater). A hydrogen production photo fermentative methodology was developed using cheese whey as a substrate for the bacteria Rhodobacter capsulatus strain IR3::LacZ and B10::LacZ . The project was carried out in three stages.The purpose of the first stage is to identify the relevant factors to produce hydrogen for a synthetic whey medium in a photofermentation process, using the Design of Experiments methodology. The products of this stage are four statistical models, obtained for each strain and buffer solution studied. The strain IR3::LacZ was selected for the experiments with industrial whey as substrate. The maximum volumetric yield and the product/substrate yield YP/S were 64 ml h-1L-1 and 2.08 mol H2 mol-1 C (C is the carbon source in this case lactose and lactate) and 43.01 ml h-1L-1 and 2.52 mol H2 mol-1 C for phosphate buffer and Kolthoff buffer, respectively.In the second stage the production of hydrogen with industrial whey was evaluated. A three-step pre-treatment was applied before using industrial cheese whey as substrate: fat reduction, deproteinization and sterilization. A validate statistical model describing hydrogen production was only obtained for phosphate buffer. The maximum volumetric yield and the product/substrate yield YP/S were 45.93 ml h-1L-1 and 2.29 mol H2 mol-1 C respectively. The addition of an homofermentation to the pretreatment improved the production yield, in this case a volumetric productivity of 69.71 ml h-1L-1 and a YP/S of 2.96 mol H2 mol-1 C were obtained.The third stage was the scale-up to 1.5 and 1 reactor L for synthetic whey and 1L for synthetic and industrial whey respectively. A fermentative process appeared due to a bacterial contamination, leading to a high biogas production. Biogas was exclusively composed of H2 and CO2 the last in a concentration not exceeding 30% (v/v). For this reason, it was concluded that the integrated production process coupling dark and photo fermentations) is an option with great potential for the use of whey as substrate in the production of hydrogen
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Pătru, Alexandra. "Développement de catalyseurs pour un électrolyseur alcalin H2/O2." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20012.

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Le travail de thèse présenté dans ce mémoire, est consacré à l'étude des nouveaux matériaux d'électrodes pour l'électrolyse de l'eau en milieu alcalin. L'objectif de ces études est de développer de nouveaux électrocatalyseurs à base de métaux non nobles, capables d'améliorer les cinétiques de réactions intervenant dans la décomposition de l'eau : l'évolution de l'hydrogène (HER) et l'évolution de l'oxygène (OER). L'amélioration des performances catalytiques se traduit par une diminution des surtensions de réaction et donc de l'énergie nécessaire à la production de l'hydrogène. Pour cela, nous avons choisir de réaliser des électrodes à base de nanoparticules de nickel et de cobalt pour l'HER et de nanoparticules de cobaltites de cobalt, Co3O4, pour l'OER. La mise au point de plusieurs méthodes innovantes de formulation des électrodes (dépôt par électrophorèse « réactive » et électrodes composites à base liant organique fonctionnel) a permis la réduction des surtensions des réactions. Pour une densité de courant de 100 mA cm-2, une surtension cathodique de -286 mV est nécessaire avec les électrodes composites à base de nanoparticules de nickel, -238 mV pour une électrode en Co obtenue par électrophorèse et une surtension anodique 323 mV pour une électrode composite à base de nanoparticules de Co3O4. Une étude électrochimique approfondie de l'HER a été réalisée sur différentes morphologies de nanoparticules de nickel
The PhD work, presented in this manuscript, is devoted to the study of new electrode materials for alkaline water electrolysis.The aim of this study is to develop new electrocatalysts based on non-noble metals. These catalysts are designed to improve the kinetics of the reactions involved in the water splitting: hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The improvement of catalytic reaction results in the decrease of the overpotentials and therefore the saving of energy needed for hydrogen production. To do that, nickel and cobalt nanoparticles were used for HER, and Co3O4 nanoparticles for OER. The development of several innovative methods for electrode formulation (deposition by electrophoresis and composites electrodes based on a functional organic binder) reduced the overpotential reactions. For a current density of 100 mA cm-2, -286 mV of cathodic overpotential is needed for composites electrodes based on nickel nanoparticles, -238 mV for a Co-based electrode made by electrophoresis and 323 mV of anodic overpotential for a Co3O4 -based composite electrode. A detailed electrochemical study was made for HER on various morphologies of nickel nanoparticles
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Books on the topic "Hydrogen"

1

Saunders, N. Hydrogen. Chicago: Heinemann Library, 2004.

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Blashfield, Jean F. Hydrogen. Austin, Tex: Raintree Steck-Vaughn, 1999.

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Blashfield, Jean F. Hydrogen. Austin, Tex: Raintree Steck-Vaughn, 1999.

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Farndon, John. Hydrogen. New York: Benchmark Books, 2000.

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Zell, Thomas, and Robert Langer, eds. Hydrogen Storage. Berlin, Boston: De Gruyter, 2018. http://dx.doi.org/10.1515/9783110536423.

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Godula-Jopek, Agata, ed. Hydrogen Production. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527676507.

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Peschka, Walter. Liquid Hydrogen. Vienna: Springer Vienna, 1992. http://dx.doi.org/10.1007/978-3-7091-9126-2.

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Léon, Aline, ed. Hydrogen Technology. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-69925-5.

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Zohuri, Bahman. Hydrogen Energy. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-93461-7.

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Jaunatre, Matthieu. Renewable Hydrogen. Wiesbaden: Springer Fachmedien Wiesbaden, 2021. http://dx.doi.org/10.1007/978-3-658-32642-5.

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Book chapters on the topic "Hydrogen"

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Schmersahl, Ralf, Marco Klemm, Ruth Brunstermann, and Renatus Widmann. "Hydrogen hydrogen from Biomass hydrogen from biomass." In Encyclopedia of Sustainability Science and Technology, 5116–33. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0851-3_318.

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Schmersahl, Ralf, Marco Klemm, Ruth Brunstermann, and Renatus Widmann. "Hydrogen hydrogen from Biomass hydrogen from biomass." In Renewable Energy Systems, 1100–1117. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-5820-3_318.

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Brophy, James G., and Arndt Schimmelmann. "Hydrogen." In Encyclopedia of Earth Sciences Series, 1–4. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39193-9_325-1.

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Brophy, James G., and Arndt Schimmelmann. "Hydrogen." In Encyclopedia of Earth Sciences Series, 693–96. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-39312-4_325.

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O’Neill, Peter. "Hydrogen." In Environmental Chemistry, 44–67. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-010-9318-7_3.

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Ammerlaan, C. A. J. "Hydrogen." In Silicon, 261–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-09897-4_14.

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Cleaves, Henderson James. "Hydrogen." In Encyclopedia of Astrobiology, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_750-4.

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Cleaves, Henderson James. "Hydrogen." In Encyclopedia of Astrobiology, 1146–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_750.

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Cleaves, Henderson James. "Hydrogen." In Encyclopedia of Astrobiology, 781. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_750.

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Zini, Gabriele, and Paolo Tartarini. "Hydrogen." In Solar Hydrogen Energy Systems, 13–28. Milano: Springer Milan, 2012. http://dx.doi.org/10.1007/978-88-470-1998-0_2.

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Conference papers on the topic "Hydrogen"

1

Marzouk, Osama A. "2030 Ambitions for Hydrogen, Clean Hydrogen, and Green Hydrogen." In ASEC 2023. Basel Switzerland: MDPI, 2023. http://dx.doi.org/10.3390/asec2023-15497.

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Stavola, Michael. "Hydrogen in Semiconductors." In HYDROGEN IN MATERIALS & VACUUM SYSTEMS: First International Workshop on Hydrogen in Materials and Vacuum Systems. AIP, 2003. http://dx.doi.org/10.1063/1.1597353.

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Mintz, Marianne. "Hydrogen Distribution Infrastructure." In HYDROGEN IN MATERIALS & VACUUM SYSTEMS: First International Workshop on Hydrogen in Materials and Vacuum Systems. AIP, 2003. http://dx.doi.org/10.1063/1.1597363.

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Bouteldja, M., and Y. Le Gallo. "From hydrogen storage potential to hydrogen capacities in underground hydrogen storages." In 84th EAGE Annual Conference & Exhibition. European Association of Geoscientists & Engineers, 2023. http://dx.doi.org/10.3997/2214-4609.2023101293.

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Lindblad, Peter. "Hydrogen in Biological Systems." In HYDROGEN IN MATERIALS & VACUUM SYSTEMS: First International Workshop on Hydrogen in Materials and Vacuum Systems. AIP, 2003. http://dx.doi.org/10.1063/1.1597352.

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Nasuti, Francesco, Barbara Betti, and Marco Balucani. "Hydrogen Microthrusters based on Hydrogen Storage Materials." In 46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-6965.

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Smitkova, Miroslava Farkas, Frantisek Janicek, and Florinda Martins. "Hydrogen Economy : Brief Sumarization of Hydrogen Economy." In 2022 International Conference on Electrical, Computer and Energy Technologies (ICECET). IEEE, 2022. http://dx.doi.org/10.1109/icecet55527.2022.9872907.

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Dohrmann, Anja, and Martin Krüger. "Microbial Hydrogen Transformation During Underground Hydrogen Storage." In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.9711.

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McDaniel, Anthony. "HydroGEN: Solar Thermochemical Hydrogen (STCH) Water Splitting." In Proposed for presentation at the DOE Hydrogen and Fuel Cell Technologies Office virtual 2021 Annual Merit Review and Peer Evaluation Meeting (AMR) held June 7-11, 2021 in virtual, virtual, virtual. US DOE, 2021. http://dx.doi.org/10.2172/1866897.

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Xiong, Yujie. "Interface engineering in inorganic hybrid structures towards improved photocatalysis (Conference Presentation)." In Solar Hydrogen and Nanotechnology XI, edited by Chung-Li Dong. SPIE, 2016. http://dx.doi.org/10.1117/12.2237257.

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Reports on the topic "Hydrogen"

1

Skone, Timothy J. Hydrogen Production. Office of Scientific and Technical Information (OSTI), February 2010. http://dx.doi.org/10.2172/1509398.

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Karnesky, Richard A., Raymond William Friddle, Josh A. Whaley, and Geoffrey Smith. Permeation of "Hydromer" Film: An Elastomeric Hydrogen-Capturing Biopolymer. Office of Scientific and Technical Information (OSTI), December 2015. http://dx.doi.org/10.2172/1234933.

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Ruckman, M. W., H. Wiesmann, M. Strongin, K. Young, and M. Fetcenko. Composite Metal-hydrogen Electrodes for Metal-Hydrogen Batteries. Office of Scientific and Technical Information (OSTI), April 1997. http://dx.doi.org/10.2172/770461.

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Zholdayakova, Saule, Yerdaulet Abuov, Daulet Zhakupov, Botakoz Suleimenova, and Alisa Kim. Toward a Hydrogen Economy in Kazakhstan. Asian Development Bank Institute, October 2022. http://dx.doi.org/10.56506/iwlu3832.

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The energy transition is driving governments and industries to adopt various measures to reduce their climate impacts while maintaining the stability of their economy. Hydrogen technologies are one of the central topics in the energy transition. Different nations have different stances on it. Some governments see hydrogen as a decarbonization tool or part of their energy security strategy, while some others see it as a potential export commodity. While identifying priorities for the future, Kazakhstan should clearly define the role of hydrogen in the country’s long-term energy and decarbonization strategy. This work presents the first country-scale assessment of hydrogen technologies in Kazakhstan by focusing on policy, technology and economy aspects. A preliminary analysis has shown that Kazakhstan should approach hydrogen mainly as a part of its long-term decarbonization strategy. While coping with the financial risks of launching a hydrogen economy, the country can benefit from the export potential of low-carbon hydrogen in the near term. The export potential of low-carbon hydrogen in Kazakhstan is justified by its proximity to the largest hydrogen markets, huge resource base, and potentially low cost of production (in the case of blue hydrogen). Technology options for hydrogen transportation and storage for Kazakhstan are discussed in our work. The paper also identifies target hydrogen utilization areas in emission sectors regulated by Kazakhstan’s Emissions Trading System.
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Gennett, Thomas. Position Paper: Hydrogen Spillover Limitations for Onboard Hydrogen Storage. Office of Scientific and Technical Information (OSTI), January 2019. http://dx.doi.org/10.2172/1489894.

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Elias Stefanakos, Burton Krakow, and Jonathan Mbah. Hydrogen Production from Hydrogen Sulfide in IGCC Power Plants. Office of Scientific and Technical Information (OSTI), July 2007. http://dx.doi.org/10.2172/927111.

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Ohi, J. 2005 DOE Hydrogen Program Review: Hydrogen Codes and Standards. Office of Scientific and Technical Information (OSTI), May 2005. http://dx.doi.org/10.2172/15016867.

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Joshi, Mohit, Ilya Chernyakhovskiy, and Mark Chung. Hydrogen 101: Frequently Asked Questions About Hydrogen for Decarbonization. Office of Scientific and Technical Information (OSTI), July 2022. http://dx.doi.org/10.2172/1879231.

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Hu, Jian. Photoelectrochemical Hydrogen Production. Office of Scientific and Technical Information (OSTI), December 2013. http://dx.doi.org/10.2172/1111421.

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Philippidis, George, and Vekalet Tek. PHOTOBIOLOGICAL HYDROGEN RESEARCH. Office of Scientific and Technical Information (OSTI), July 2009. http://dx.doi.org/10.2172/1130089.

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