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Dissertations / Theses on the topic 'Electrocatalytic hydrogen production'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Feng, Xinliang, Jian Zhang, Tao Wang, et al. "Engineering water dissociation sites in MoS2 nanosheets for accelerated electrocatalytic hydrogen production." Royal Society of Chemistry, 2016. https://tud.qucosa.de/id/qucosa%3A30309.

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Earth-abundant MoS2 is widely reported as a promising HER electrocatalyst in acidic solutions, but it exhibits extremely poor HER activities in alkaline media due to the slow water dissociation process. Here we present a combined theoretical and experimental approach to improve the sluggish HER kinetics of MoS2 electrocatalysts through engineering the water dissociation sites by doping Ni atoms into MoS2 nanosheets. The Ni sites thus introduced can effectively reduce the kinetic energy barrier of the initial water-dissociation step and facilitate the desorption of the −OH that are formed. As a

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2

Feng, Xinliang, Jian Zhang, Tao Wang, et al. "Engineering water dissociation sites in MoS2 nanosheets for accelerated electrocatalytic hydrogen production." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-224286.

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Earth-abundant MoS2 is widely reported as a promising HER electrocatalyst in acidic solutions, but it exhibits extremely poor HER activities in alkaline media due to the slow water dissociation process. Here we present a combined theoretical and experimental approach to improve the sluggish HER kinetics of MoS2 electrocatalysts through engineering the water dissociation sites by doping Ni atoms into MoS2 nanosheets. The Ni sites thus introduced can effectively reduce the kinetic energy barrier of the initial water-dissociation step and facilitate the desorption of the −OH that are formed. As a

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3

Streich, Daniel. "Stepping into Catalysis : Kinetic and Mechanistic Investigations of Photo- and Electrocatalytic Hydrogen Production with Natural and Synthetic Molecular Catalysts." Doctoral thesis, Uppsala universitet, Fysikalisk kemi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-197946.

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In light of its rapidly growing energy demand, human society has an urgent need to become much more strongly reliant on renewable and sustainable energy carriers. Molecular hydrogen made from water with solar energy could provide an ideal case. The development of inexpensive, robust and rare element free catalysts is crucial for this technology to succeed. Enzymes in nature can give us ideas about what such catalysts could look like, but for the directed adjustment of any natural or synthetic catalyst to the requirements of large scale catalysis, its capabilities and limitations need to be und

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4

Sakamoto, Takahiro. "Relationships between Gas-Phase Ionization Energies and Solution-Phase Oxidation Potentials: Applications to the Electrocatalytic Production of Hydrogen from Weak Acids." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/194534.

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The transfer of electrons to and from a molecule is one of the more fundamental and important chemical processes. One such important example is the reduction-oxidation (redox) cycles in catalysts and enzymes. In the hydrogenase enzymes, adding and removing electrons is one of the key processes for generating H₂ from water molecules. Finding a direct free energy relation between the vertical ionization energies (IE(V)) measured spectroscopically by gas-phase photoelectron spectroscopy and the oxidation potentials (E(1/2)) measured thermodynamically in solution by cyclic voltammetry (CV) for mol

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5

Lin, J. F. (Jhih-Fong). "Multi-dimensional carbonaceous composites for electrode applications." Doctoral thesis, Oulun yliopisto, 2015. http://urn.fi/urn:isbn:9789526208459.

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Abstract The objective of this thesis is to demonstrate multi-dimensional carbon nanotube (CNT) structures in combination with various active materials in order to evaluate their performance in electrode applications such as cold emitters, electric double-layer capacitors (EDLC), and electrochemical sensor/catalyst devices. As the host materials for other active materials, the construction of multi-dimensional CNT nanostructures in this thesis is achieved by two different approaches. In the first, direct growth of 3-dimensional carbon nanostructures by catalytic chemical deposition to produce

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6

Garrett, Benjamin R. "MoO(S2)2L Based Molecular Electrocatalysts for Hydrogen Production." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1490964132615695.

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7

Popat, Yaksh Jyotindra. "Synthesis and characterization of nanocatalysts for applications in water purification and hydrogen production." Doctoral thesis, Università degli studi di Trento, 2019. http://hdl.handle.net/11572/246086.

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The thesis focuses on synthesis and characterization of nanocatalysts for applications in wastewater treatment and hydrogen production through electrochemical water splitting. Different photocatalysts and electrocatalysts are synthesized using wet chemistry techniques as well as Pulsed Laser Deposition (PLD). The synthesized catalysts pave demonstrate excellent catalytic activity thereby paving way for their use on an industrial scale.

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8

Bou-Saleh, Ziad. "Nickel-based 3D electrocatalyst layers for production of hydrogen by water electrolysis in an acidic medium." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112559.

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This thesis discusses results on the development of three-dimensional (3D) Ni-based electrocatalytic layers for hydrogen production by water electrolysis in an acidic medium. This is of relevance to the development of polymer-electrolyte-membrane (PEM) hydrogen generators, which are promising hydrogen production systems suitable for both residential and industrial applications.<br>It was demonstrated that patterning of a glassy carbon electrode substrate with a 3D polyaniline (PANI) matrix is a convenient way of increasing the electrocatalytically active surface area of electrodeposited Ni, an

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9

Cooper, Matthew. "Electrocatalysis of the Oxidation of Ammonia by Raney Nickel, Platinum and Rhodium." Ohio University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1127167561.

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10

Pizzutilo, Enrico [Verfasser], Gerhard [Gutachter] Dehm, and Karl J. J. [Gutachter] Mayrhofer. "Towards on-site production of hydrogen peroxide with gold-palladium catalysts in electrocatalysis and heterogeneous catalysis / Enrico Pizzutilo ; Gutachter: Gerhard Dehm, Karl J. J. Mayrhofer." Bochum : Ruhr-Universität Bochum, 2017. http://d-nb.info/1144614716/34.

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11

Bonnin, Egilda Purusha. "Electrolysis of Ammonia Effluents: A Remediation Process with Co-generation of Hydrogen." Ohio : Ohio University, 2006. http://www.ohiolink.edu/etd/view.cgi?ohiou1156435340.

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12

Cherdo, Stéphanie. "Des complexes cage aux nanoparticules, nouveaux catalyseurs pour la production du dihydrogène." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-01071035.

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Ce travail porte sur les complexes des métaux de transitions pour la catalyse de la réduction des protons en hydrogène. La nature de l'espèce catalytiquement active mise en jeu lors du processus de réduction a été étudiée par voltampérométrie cyclique afin de comprendre le rôle et le mode d'action de ces complexes. Le premier chapitre introduit le contexte et les principaux objectifs de ce travail. Le deuxième chapitre propose une étude électochimique de complexes de cobalt et de nickel à ligands bis(glyoxime) et clathrochélates en phase homogène. Leur comportement en présence d'acide et en co

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13

Zhou, Rongwei. "New Polyazine-Bridged Ru(II),Rh(III) and Ru(II),Rh(I) Supramolecular Photocatalysts for Water Reduction to Hydrogen Applicable for Solar Energy Conversion and Mechanistic Investigation of the Photocatalytic Cycle." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/50832.

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The goal of this research is to test the design constraints of active dpp-bridged RuII,RhIII (dpp = 2,3-bis(2-pyridyl)pyrazine)) supramolecular photocatalysts for water reduction to H2 and provide mechanistic insights into the catalytic cycle. Two member of a new RuII,RhIII motifs with only one Rh-'Cl bond, [(bpy)2Ru(dpp)RhCl(tpy)](PF6)4 ( bpy = 2,2'-bipyridine, tpy = 2,2':6,2"-terpyridine) and [(bpy)2Ru(dpp)RhCl(tpm)](PF6)4, (tpm = tris(1-pyrazolyl)methane), and a cis-RhCl2 model system, [(bpy)2Ru(dpp)RhCl2(bpy)](PF6)3, were prepared. This new motif was to test whether two Rh-'Cl bonds on RhI

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14

"Bioinspired Electrocatalytic Hydrogen Production: Synthetic and Biological Approaches." Doctoral diss., 2017. http://hdl.handle.net/2286/R.I.44319.

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abstract: Development of efficient and renewable electrocatalytic systems is foundational to creation of effective means to produce solar fuels. Many redox enzymes are functional electrocatalysts when immobilized on an electrode, but long-term stability of isolated proteins limits use in applications. Thus there is interest in developing bio-inspired functional catalysts or electrocatalytic systems based on living organisms. This dissertation describes efforts to create both synthetic and biological electrochemical systems for electrocatalytic hydrogen production. The first part of this disse

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15

Harn, Yeu-Wei, and 韓羽唯. "Synthesis of Intertwined Nanosheets via Kirkendall Effect with Controlled Morphologyfor Electrocatalytic Hydrogen Production." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/j36jc7.

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16

Hung, Yu-Han, and 洪郁涵. "Increase the Active Site of MoS2 Hybrid Electrode for Efficient Electrocatalytic Hydrogen Production." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/66nszr.

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碩士<br>國立中央大學<br>能源工程研究所<br>105<br>Molybdenum disulfide (MoS2) has recently emerged as a promising catalyst for the hydrogen evolution reaction (HER) in water splitting that may replace the noble metals such as platinum and rubidium, a cost-effective and highly catalytic material. Two-dimensional MoS2 structures with exposed S-edge have been reported as active electrocatalytic catalyst for hydrogen production. We utilize these two different ways to generate exposed active sites: 1. Prepare dense arrays of MoS2 nanoribbons by combining procedures of micromolding in capillaries (MIMIC) and thermo

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17

"Electrocatalytic and Photoelectrosynthetic Hydrogen Production using Metalloporphyrins and Molecular-modified Gallium Phosphide Photocathodes." Doctoral diss., 2019. http://hdl.handle.net/2286/R.I.53743.

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abstract: Metalloporphyrins represent a class of molecular electrocatalysts for driving energy relevant half-reactions, including hydrogen evolution and carbon dioxide reduction. As electrocatalysts, they provide a strategy, and potential structural component, for linking renewable energy sources with the production of fuels and other value-added chemicals. In this work, porphyrins are used as structural motifs for exploring structure-function relationships in electrocatalysis and as molecular building blocks for assembling photoelectrochemical assemblies leveraging the light capture and conve

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18

Yeh, Shih-Wey, and 葉士維. "Insight Into the Dinuclear {Fe(NO)2}10-{Fe(NO)2}10 and Mononuclear {Fe(NO)2}10 Dinitrosyliron Complexes (DNICs): Potential for Electrocatalytic Hydrogen Production." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/375hq9.

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