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Dissertations / Theses on the topic 'Renewable hydrogen production'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

FERNANDEZ, J. LASSO. "HYDROGEN PRODUCTION FROM RENEWABLE PRIMARY SOURCES." Doctoral thesis, Università degli Studi di Milano, 2016. http://hdl.handle.net/2434/366899.

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ABSTRACT One of the most attracting renewable sources for energy production is bioethanol, which can be obtained from biomass. Special attention is here focused on the steam reforming reaction of ethanol (SRE) in which the principal product, hydrogen, is an interesting energy vector to produce power, electricity and heat. However, the process has not yet come to maturity and it should be optimized in order to made it industrially available. To this aim, we focused our work on catalysts synthesis for SRE, trying to couple high activity and durability. Different catalyst formulations based

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2

Dixon, Christopher Ross. "Routes towards low-cost renewable hydrogen production." Thesis, University of Dundee, 2015. https://discovery.dundee.ac.uk/en/studentTheses/2e1d9208-0537-4a8b-b4a9-f1e0d8382b35.

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The transition from declining conventional fossil fuel energy to renewables is one of the most significant challenges facing humanity. Hydrogen is anticipated as the key future energy vector. This is sought to bring more value and utility to renewable energy resources, and eventually providing an energy storage medium to replace fossil fuels such as for automotive applications. This thesis contains an investigation of hydrogen production through renewable low-cost and low-carbon processes. Literature reviews of conventional and renewable H<sub>2</sub> production methods and storage (compressio

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Gombac, Valentina. "Photocatalytic processes for sustainable hydrogen production from renewable sources." Doctoral thesis, Università degli studi di Trieste, 2012. http://hdl.handle.net/10077/7385.

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2010/2011<br>The importance of hydrogen as an appealing energy vector, due to its high efficiency and environment-friendly use in Fuel Cells, is nowadays well recognized and documented. Nevertheless, in spite of several research activities in this field, the large-scale production of H2 is still a challenging issue in view of the possible transition to an H2-based economy. In this context, the development of materials capable of acting as multi-functional platforms for the sustainable generation, though representing a strategic target, is still far from being completely satisfied. In order to

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4

Mirabal, Samantha T. "An economic analysis of hydrogen production technologies using renewable energy resources." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0002060.

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5

Nichele, Valentina <1985&gt. "Innovative and versatile heterogeneous catalysts for hydrogen production from renewable sources." Doctoral thesis, Università Ca' Foscari Venezia, 2014. http://hdl.handle.net/10579/5604.

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The steam reforming of biomass derivatives such as ethanol and glycerol is an attractive process to produce hydrogen, the energy carrier of the future. The fulfillment of this process on industrial scale is strictly related to the design of a highly active and selective catalyst. This study focused on the effect of different parameters (the physico-chemical properties of the support; the metal-support interaction; the reducibility and the dispersion of the active phase) on the performance of Ni-based catalysts. It was demonstrated that Ni is an effective active phase in the steam reforming of

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Li, Molly Meng-Jung. "Bimetallic alloy catalysts for green methanol production via CO2 and renewable hydrogen." Thesis, University of Oxford, 2018. https://ora.ox.ac.uk/objects/uuid:7e28950e-85e9-4d9a-b791-3f5d1172065e.

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Recently, the increasing level of atmospheric CO<sub>2</sub> has been widely noticed due to its association with global warming, provoking a growth in environmental concerns toward the continued use of fossil fuels. To mitigate the concentration of atmospheric CO<sub>2</sub>, various strategies have been implemented. Among options to turn waste CO<sub>2</sub> into useful fuels and chemicals, carbon capture and utilisation along with renewable hydrogen production as the source materials for methanol production is more preferable. In the 1960s, the highly active and economic Cu/ZnO/Al<sub>2</sub

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Perkins, Christopher Michael. "Solar thermal decomposition of zinc oxide in aerosol flow for renewable hydrogen production." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3239400.

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8

Chidziva, Stanford. "Green hydrogen production for fuel cell applications and consumption in SAIAMC research facility." University of Western Cape, 2020. http://hdl.handle.net/11394/7859.

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Philosophiae Doctor - PhD<br>Today fossil fuels such as oil, coal and natural gas are providing for our ever growing energy needs. As the world’s fossil fuel reserves fast become depleted, it is vital that alternative and cleaner fuels are found. Renewable energy sources are the way of the future energy needs. A solution to the looming energy crisis can be found in the energy carrier hydrogen. Hydrogen can be produced by a number of production technologies. One hydrogen production method explored in this study is electrolysis of water.

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9

Llavero, Pasquina Marcel. "Engineered light controlled cell development for enhanced hydrogen production in Nostoc punctiforme ATCC 29133." Thesis, Uppsala universitet, Mikrobiell kemi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-294854.

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The aim of this thesis is to enhance heterocyst-based hydrogen production inNostoc punctiforme ATCC 29133. We envision to do so by finely regulatingthe ratio of heterocyst in order to optimize the filament energy balance. Wehereby report the development of an optogenetic synthetic switch basedon the native PcpeC promoter. The optogenetic switch featured a 24-folddynamic range when measuring reporter sfGFP fluorescence. Such a geneticgate was conceived to artificially drive the expression of hetR, the masterregulator of heterocyst development. We achieved to induce enhancedheterocyst differenti

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Abdallah, Ibrahim. "Event-driven hybrid bond graph : Application : hybrid renewable energy system for hydrogen production and storage." Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10104/document.

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Ce travail de thèse constitue une contribution à la modélisation et au diagnostic des systèmes multi-domaines à commutation (hybrides). Il est appliqué à la supervision des systèmes multi-sources d’énergie propre où l’hydrogène est utilisé comme moyen de stockage. Un tel système associe des composantes énergétiques de nature différente et fait l’objet de commutations produites par la connexion et déconnexion d’un ou plusieurs composants. Ces commutations génèrent différents modes de fonctionnement et sont liées à l’intermittence des sources primaires, aux capacités de stockage et à la disponib

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11

Qian, Zhao. "Atomistic Modelling of Materials for Clean Energy Applications : hydrogen generation, hydrogen storage, and Li-ion battery." Doctoral thesis, KTH, Tillämpad materialfysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-129220.

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In this thesis, a number of clean-energy materials for hydrogen generation, hydrogen storage, and Li-ion battery energy storage applications have been investigated through state-of-the-art density functional theory. As an alternative fuel, hydrogen has been regarded as one of the promising clean energies with the advantage of abundance (generated through water splitting) and pollution-free emission if used in fuel cell systems. However, some key problems such as finding efficient ways to produce and store hydrogen have been hindering the realization of the hydrogen economy. Here from the scien

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Olsson, Philip, and Martin Tholander. "A feasibility study on production and storage of hydrogen with renewable energy resources at municipal scale." Thesis, KTH, Energiteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299876.

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The feasibility of a PEM hydrogen storage system in a municipal setting using prosumer excess solar power has been investigated. The feasibility was determined upon key performance indicators payback time, internal rate of return (IRR) and net profit margin. The project was done as a case study on Södertälje municipality, Stockholm, Sweden. Different business models were compared to determine the optimal operation scheme. Potential showstoppers were also explored. Literature study and interviews were combined into a system model in Excel which breaks down costs and profits over a 20-year timel

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HIDALGO, DIAZ DIANA CAROLINA. "Development of innovative materials used in electrochemical devices for the renewable production of hydrogen and electricity." Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2588827.

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One of the most important challenges for our society is providing powerful devices for renewable energy production. Many technologies based on renewable energy sources have been developed, which represent a clean energy sources that have a much lower environmental impact than conventional energy technologies. Nowadays, many researches focus their attention on the development of renewable energy from solar, water, organic matter and biomass, which represent abundant and renewable energy sources. This research is mainly focused on the development of promising electrode materials and their potent

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Tapia, Luis Carlos Felix. "Sustainability Assessment of Hydrogen Production Techniques in Brazil through Multi-Criteria Analysis." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-129043.

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Current global demands for energy resources along with continuous global population growth have placed natural environments and societies under great stress to fulfill such a need without disrupting economic and social structures. Policy and decision-making processes hold some of the most important keys to allow safe paths for societies towards energy security and safeguard of the environment. Brazil has played a lead role within renewable energy production and use during the last decades, becoming one of the world’s leading producer of sugarcane based ethanol and adapting policies to support

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ARRIGONI, FEDERICA. "Chemistry and renewable energy: DFT investigation on CO2 reduction and H2 oxidation/production catalyzed by transition metal biomimics." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2017. http://hdl.handle.net/10281/153273.

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My PhD research has been devoted to the investigation of diiron dithiolate compounds, that are structurally and functionally related to [FeFe]-hydrogenase and nitrogenase active sites. DFT computations provided relevant insights for a better comprehension of the chemistry of these systems, at the same time posing new questions and hints for future prospects. The core of the thesis is dedicated to [FeFe]-hydrogenase biomimics, whose structures and reactivity have been theoretically addressed by various standpoints. Several gaps concerning the activity of these systems still need to be filled.

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Younes, George. "Integration of offshore renewable energy sources for the production of chemical energy vectors: The case of Hydrogen." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Energy is the fuel that drives our economies. Energy demand is on the rise, and so the challenge of meeting the needs for safer, more efficient, and environmentally friendly solutions. With the aim of staying below the 2℃ scenario and agreeing with the 2015 Paris agreement and the European Union 2050 Green Deal, further action is required to ensure a smooth energy transition. In the offshore context the challenge persists, as renewable energy is weather and climate dependent, but represents a great opportunity for energy transition. For these reasons, along with the latest oil crisis due to C

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Kimani, Duane. "Biodiesel and Hydrogen Production : A Study of Nostoc sp. in Pulp and Paper Wastewater." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-125085.

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The modernized world is over-consuming low-cost energy sources that strongly contributes to environmental stress. As a consequence, the interest for environmentally friendly alternatives has increased immensely. One such alternative is utilizing the diazotrophic nature of the heterocystous filamentous cyanobacteria Nostoc sp. as feedstock for biodiesel and hydrogen production using pulp and paper wastewater – a phosphorous and nitrogen deficient medium. In this work, biodiesel and hydrogen production was studied with respect to three main aspects: biodiesel quality properties, lipid content an

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18

Rossi, Gianmarco. "modeling of proton exchange membrane water electrolyzer for green hydrogen production from solar energy." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Hydrogen is considered one of the means by which to store energy coming from renewable and intermittent power sources. With the growing capacity of renewable energy sources, a storage system is required to not waste energy. PEM electrolysis provides a sustainable solution for the production of hydrogen and is well suited to couple with energy sources such as solar and wind. This work reports the development of simulation software to estimate the performance of a proton exchange membrane electrolyzer working at atmospheric or low pressure conditions connected to a solar energy source. The ele

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Bessi, Matteo. "Development of new highly conjugated molecules and their application in the field of renewable energy and biomaterials." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAF056/document.

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Ces dernières années, les matériaux fonctionnels hybrides ont commencé à être employés pour des applications de la haute technologie, allant des senseurs bio/médicaux, à la production d’énergie renouvelable. Pour cette raison, ils sont devenus le centre de plusieurs études dans le domaine des sciences des matériaux. Simultanément, des molécules conjuguées ont été examinée intensément à cause de leurs propriétés venant de leurs longs systèmes π, allant de la possibilité de conduire l’électricité, à leur capacité d’absorber la lumière dans une grande fenêtre spectrale. Le travail de cette thèse

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Bessi, Matteo. "DEVELOPMENT OF NEW HIGHLY CONJUGATED MOLECULES AND THEIR APPLICATION IN THE FIELD OF RENEWABLE ENERGY AND BIOMATERIALS." Doctoral thesis, Università di Siena, 2018. http://hdl.handle.net/11365/1066871.

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Negli ultimi anni, i materiali funzionalizzati ibridi hanno iniziato ad essere largamente impiegati in applicazioni altamente tecnologiche, dai sensori bio/medicali alla produzione di energie rinnovabili. Per questa ragione sono diventati l’oggetto di diversi studi nell’ambito della scienza dei materiali. Allo stesso tempo, le molecole organiche coniugate sono state intensivamente analizzate per via delle loro proprietà particolari riconducibili alla presenza di un lungo sistema di legami π, dalla possibilità di condurre elettricità al loro largo spettro di assorbimento della radiazione lumin

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Roy, Amitava. "Dynamic and transient modelling of electrolysers powered by renewable energy sources and cost analysis of electrolytic hydrogen." Thesis, Loughborough University, 2006. https://dspace.lboro.ac.uk/2134/10973.

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Hydrogen energy sector has gained significant attention worldwide but one of the key enabling components for its success would be cheaper and sustainable hydrogen production. Hydrogen could be produced directly from natural gas or coal etc; alternatively it could be produced by electrolysis of water powered by renewable energy sources, nuclear energy or fossil fuel. Wind energy is growing rapidly, which can produce cheap hydrogen. Electrolysers can be employed to control the frequency of the electricity grid while also making fuel as a by-product. This thesis concerns the intricacies of hydrog

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von, Hepperger Florian. "Implementation of water electrolysis in Växjö´s combined heat and power plant and the use of excess heat : A techno-economic analysis." Thesis, Linnéuniversitetet, Institutionen för byggd miljö och energiteknik (BET), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-105276.

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Renewable energies are fluctuating and the bigger its share on the Swedish energy market, the more fluctuating are the prices. Therefore, CHP plant operators as VEAB in Växjö, are more and more struggling to be competitive. There is, hence, a need of alternative options for the use of produced electricity, rather than being dependent on such a volatile and unclear market. Hydrogen production through water electrolysis could therefore be an alternative to be decoupled from the electricity business and instead being part of a promising, future hydrogen economy. Since state-of-the-art electrolyse

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Topriska, Evangelia Vasiliki. "Experimental and computational study of a solar powered hydrogen production system for domestic cooking applications in developing economies." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/12824.

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In many developing economies, a high percentage of domestic energy demand is for cooking based on fossil and biomass fuels. Their use has serious health consequences affecting almost 3 billion people. Cleaner cooking systems have been promoted in these countries such as solar cooking and smokeless stoves with varying degrees of success. In parallel, solar electrolytic hydrogen systems have been developed and increasingly used during the last 25 years for electricity, heat and automobile fueling applications. This study has developed and tested experimentally in the laboratory a solar hydrogen

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Guan, Tingting. "Biomass-fuelled PEM FuelCell systems for small andmedium-sized enterprises." Doctoral thesis, KTH, Energiprocesser, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-176633.

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Biomass-fuelled proton exchange membrane fuel cells (PEMFCs) offer asolution for replacing fossil fuel for hydrogen production. Through using thebiomass-derived hydrogen as fuel, PEMFCs may become an efficient andsustainable energy system for small and medium-sized enterprises. The aim ofthis thesis is to evaluate the performance and potential applications of biomassfuelledPEMFC systems which are designed to convert biomass to electricity andheat. Biomass-fuelled PEMFC systems are simulated by Aspen plus based ondata collected from experiments and literature.The impact of the quality of the h

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ÖHMAN, AXEL. "Green hydrogen production at Igelsta CHP plant : A techno-economic assessment conducted at Söderenergi AB." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299434.

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The energy transition taking place in various parts of the world will have many effects on the current energy systems as an increasing amount of intermittent power supply gets installed every year. In Sweden, just as many other countries, this will cause both challenges and opportunities for today´s energy producers. Challenges that may arise along with an increasingly fluctuating electricity production include both power deficits at certain times and regions but also hours of over-production which can cause electricity prices to drop significantly. Such challenges will have to be met by both

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Maiga, Omar. "Caractérisation géologique et géophysique 3D d’un système de réservoirs d’hydrogène naturel : exemple du champ de Bourakèbougou, Mali." Electronic Thesis or Diss., Sorbonne université, 2023. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2023SORUS647.pdf.

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Dans la course pour trouver des moyens de production d'hydrogène propre et bon marché, les puits d'hydrogène naturel de Bourakèbougou offrent une solution prometteuse. Non seulement l'un d'entre eux a pu être exploité avec succès pour produire de l'électricité pour le village local, mais ses vingt-quatre puits actuels offrent également une occasion unique aux géo-scientifiques de déterminer les caractéristiques des réservoirs d'hydrogène naturel, la nature des roches couvertures et les différents processus qui interviennent dans son accumulation, migration et piégeage dans les roches. Ce trava

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Larses, Patrik, and Lina Tegesjö. "Synthesis and investigation of an oxygen-evolving catalyst containing cobalt phosphate." Thesis, Department of Physics, Chemistry and Biology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-19359.

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Haratyk, Geoffrey. "Nuclear-renewables energy system for hydrogen and electricity production." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/76581.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 137-139).<br>Climate change concerns and expensive oil call for a different mix of energy technologies. Nuclear and renewables attract attention because of their ability to produce electricity while cutting carbon emissions. However their output does not match demand. This thesis introduces a nuclear-renewables energy system, that would produce electricity and hydrogen on a large scale while meeting the load de

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Min, Zhenhua. "Catalytic steam reforming of biomass tar using iron catalysts." Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/184.

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Biomass has become an increasingly important renewable source of energy forenhanced energy security and reduced CO[subscript]2 emissions. Gasification is at the core of many biomass utilisation technologies for such purposes as the generation of electricity and the production of hydrogen, liquid fuels and chemicals. However, gasification faces a number of technical challenges to become a commercially feasible renewable energy technology. The most important one is the presence of tar in the gasification product gas. The ultimate purpose of this thesis was to investigate the catalytic reforming

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Père, Valentin. "Contributions au contrôle et au dimensionnement des micro-réseaux par apprentissage par renforcement : application aux systèmes avec production renouvelable et stockage hybride batterie-hydrogène." Electronic Thesis or Diss., Ecole nationale des Mines d'Albi-Carmaux, 2023. http://www.theses.fr/2023EMAC0018.

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Le couplage de panneaux photovoltaïques avec une batterie électrochimique permet d'atténuer le déphasage journalier entre production et demande d'électricité dans un micro-réseau. Pour le stockage d'électricité à long-terme, l'utilisation conjointe d'un électrolyseur, d'un stockage hydrogène et d'une pile à combustible offre en principe la possibilité de conserver l'électricité produite en été pour les besoins accrus de l'hiver. Le contrôle optimal en temps réel des unités de stockage des micro-réseaux est entravé par les données aléatoires et le comportement dynamique non-linéaire des unités

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Mendes, Marinho Stéphanie. "Combustible solaire : caractérisation du mécanisme de transfert de charge dans des molécules photocatalytiques, vers la production de l'énergie par photosynthèse artificielle." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS299/document.

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Développer de nouvelles sources d’énergie respectueuses de l’environnement est un des enjeux majeur de nos sociétés développées. Pour espérer la pérennité de notre espèce sur cette planète, il est indispensable de développer les sources d'énergie renouvelable ; permettant de nous affranchir de la dépendance aux énergies fossiles polluantes et dont les stocks s’épuisent. Il appartient aux scientifiques d’apporter leurs contributions à cet important défi que l’on appelle la transition énergétique et pour ça d’aider à développer une énergie idéale qui ne produirait pas de déchet polluant, serait

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Metzger, Philippe. "Enjeux socio-économiques des énergies marines renouvelables en France : étude holistique de l'énergie thermique des mers." Electronic Thesis or Diss., Paris 8, 2019. http://www.theses.fr/2019PA080070.

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Les énergies marines renouvelables (EMR) représentent un potentiel de production électrique pouvant couvrir le besoin mondial. Elles sont donc porteuses de facteurs socio-économiques qu'il convient de mesurer. Le premier niveau de recherche nécessite de créer un outil de mesure, appelé coefficient de tendance, pouvant indiquer quelle technologie de captation et de production est la plus pérenne à terme.Le deuxième axe de la recherche a ensuite porté sur l'énergie thermique des mers (ETM) car son coefficient de tendance est le plus élevé. Cette étude montre le changement de paradigme latent con

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Lee, Tasi Jen, and 李采真. "Patent Method to Predict Hydrogen Production Technology Using Renewable Energy." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/66120525072053947719.

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碩士<br>逢甲大學<br>科技管理研究所<br>101<br>Global climate change and numerous energy crises have gradually forced many countries to consider hydrogen fuel and renewable energy seriously, with an increasing number of them investing appreciable resources towards the development of the hydrogen energy industry. Hydrogen is a non-polluting fuel that can be stored and used when required to convert chemical energy into electricity using fuel cells. Traditionally, hydrogen is obtained by refining fossil fuels. However, the production of hydrogen through the renewable energy confers a major advantage—zero carbon

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Hsu, Jui-Hung, and 徐瑞宏. "Performance Analysis of Hybrid System of Renewable Energy on Hydrogen Production." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/ar75bq.

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碩士<br>國立臺北科技大學<br>冷凍空調工程系所<br>94<br>To meet Kyoto Protocol proposed CO2 decreased emission plan, developing renewable energy system is to decrease CO2 emission major strategy. The current international market every year hydrogen consumption is equal to 15％ of transportation energy consumption. From this point of view, if use hydrogen instead of oil production as transportation energy. The hydrogen energy production will be quickly expanded and built to use hydrogen power as a hydrogen economic system. This thesis is concentrating on analysing hybrid renewable energy to produce hydrogen

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WinnyMargareta and 林美玲. "Dark Fermentative Hydrogen Production Using Macroalgae (Ulva sp.) as the Renewable Feedstock." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/2b2xbn.

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Tufa, Ramato Ashu, Enrico Drioli, Efrem Curcio, and Raffaele Molinari. "Renewable energy generation and hydrogen production from concentrated brine by reverse eectrodialysis." Thesis, 2016. http://hdl.handle.net/10955/1292.

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Scuola di Dottorato "Pitagora" in Scienze Ingegneristiche, Dottorato di Ricerca in Ingegneria Chimica e dei Materiali, Ciclo XXVIII, a.a. 2015-2016<br>Salinity Gradient Power-Reverse Electrodialysis (SGP-RE) is among the emerging membrane-based technologies for renewable energy generation. In RE, cation exchange membranes (CEM) and anion exchange membranes (AEMs) are alternatively aligned to create a high concentration compartment (HCC) and low concentration compartment (LCC). When the compartments are feed by a low concentration and high concentration solution, salinity gradient is creat

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Acharya, Bishnu, and Bishnu Acharya. "CHEMICAL LOOPING GASIFICATION OF BIOMASS FOR HYDROGEN-ENRICHED GAS PRODUCTION." 2011. http://hdl.handle.net/10222/14255.

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Environmental concerns and energy security are two major forces driving the fossil fuel based energy system towards renewable energy. In this context, hydrogen is gaining more and more attention in this 21st century. Presently, hydrogen is produced from reformation of fossil fuels, a process that could not address above two problems. For this it needs to be produced from a renewable carbon neutral energy source. Biomass has been identified as such a renewable energy source. Conversion of biomass through thermo-chemical gasification process in the presence of steam could provide a viable renewa

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Hahn, Nathan Taylor. "Synthesis and characterization of semiconductor thin films for photoelectrochemical energy conversion." Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-08-6017.

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The field of solar energy conversion has experienced resurgence in recent years due to mounting concerns related to fossil fuel consumption. The sheer quantity of available solar energy and corresponding opportunity for technological improvement has motivated extensive study of novel light-absorbing semiconductors for solar energy conversion. Often, these studies have focused on new ways of synthesizing and altering thin film semiconductor materials with unique compositions and morphologies in order to optimize them for higher conversion efficiencies. In this dissertation, we discuss the sy

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Sekoai, Patrick Thabang. "Dark fermentative biohydrogen production using South African agricultural, municipal and industrial solid biowaste materials." Thesis, 2017. https://hdl.handle.net/10539/25544.

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A dissertation submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, in fulfillment of the requirements for the degree of Doctor of Philosophy in Engineering, October 2017<br>The dwindling fossil reserves coupled with environmental pollution necessitate the search for clean and sustainable energy resources. Biohydrogen is emerging as a suitable alternative to fossil fuels and has received considerable attention in recent years due to its economic, social, and environmental benefits. However, the industrial application of biohydro

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Langels, Hanna, and Oskar Syrjä. "Hydrogen Production and Storage Optimization based on Technical and Financial Conditions : A study of hydrogen strategies focusing on demand and integration of wind power." Thesis, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-435176.

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There has recently been an increased interest in hydrogen, both as a solution for seasonal energy storage but also for implementations in various industries and as fuel for vehicles. The transition to a society less dependent on fossil fuels highlights the need for new solutions where hydrogen is predicted to play a key role. This project aims to investigate technical and economic outcomes of different strategies for production and storage of hydrogen based on hydrogen demand and source of electricity. This is done by simulating the operation of different systems over a year, mapping the stora

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Σεφερλής, Ανδρέας. "Μελέτη και ανάπτυξη φωτοευαίσθητων ηλεκτροδίων για την φωτοηλεκτροχημική διάσπαση του νερού". Thesis, 2010. http://nemertes.lis.upatras.gr/jspui/handle/10889/2970.

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Το αντικείμενο της διδακτορικής διατριβής είναι η σύνθεση, ο χαρακτηρισμός και η μελέτη φωτοευαίσθητων ηλεκτροκαταλυτών TiO2 και η μορφοποίηση τους σε ηλεκτρόδια, τα οποία και μελετήθηκαν ως προς την φωτοηλεκτροχημική παραγωγή υδρογόνου από νερό ή/και οργανικές ενώσεις. Τα ηλεκτρόδια λεπτών υμενίων παρασκευάστηκαν με τη μέθοδο εμβάπτισης – επίστρωσης σε διάλυμα TiO2. Τα ηλεκτρόδια Τιτάνιας ήταν νανοπορώδη και παρουσίαζαν νανοκρυσταλλική δομή ανατάση με μέγεθος σωματιδίων 15 nm. Η μελέτη των ηλεκτροδίων πραγματοποιήθηκε σε φωτοηλεκτροχημικό αντιδραστήρα. Τα αποτελέσματα έδειξαν ότι η φωτοβόληση

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