Searched for: subject%3A%22Water%255C+electrolysis%22
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Kolff, Fenna (author)
The world is witnessing unprecedented climate changes, which have worsened over the past couple of years. Despite significant progress in renewable energy, achieving a reduction of global warming remains challenging. Renewable energy sources like solar, wind, and hydroelectric technologies offer promising solutions, but challenges persist due to...
master thesis 2024
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Bleeker, J.J. (author), van Kasteren, Celine (author), van Ommen, J.R. (author), Vermaas, D.A. (author)
To make green hydrogen more economically attractive, the energy losses in alkaline electrolysis need to be minimized while operating at high current densities (1 A cm<sup>−2</sup>). At these current densities the ohmic resistance and gas bubbles effects contribute largely to the energy losses. To mitigate the gas bubbles losses, we...
journal article 2024
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Phadke, S.A. (author), de Jong, W. (author), Haverkort, J.W. (author)
The anodic co-production of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) during alkaline water electrolysis has gained interest as a sustainable alternative for anthraquinone oxidation. However, electrochemical H<sub>2</sub>O<sub>2</sub> production is often studied with idealized laboratory setups to determine the H<sub>2</sub>O<sub>2</sub>...
journal article 2024
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Haverlag, Hein (author)
In this research project, multiphase behaviour in zero gap alkaline water electrolyzers is investigated, focusing on the influence of various parameters including current density, electrode-wall distance and electrode height. This involves a cell containing a vertical electrode pair separated by a membrane submerged in an electrolyte that has a...
master thesis 2023
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Murugesan, Vikki (author)
Enhancing the efficiency of industrial water electrolysis for hydrogen production is vital for the energy transition. In Alkaline Water Electrolysis (AWE), hydrogen is produced at the cathode, and the bubbles are formed when the local hydrogen concentration exceeds the solubility limit. It is important to understand the exact local conditions...
master thesis 2023
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van As, Alex (author)
Producing green hydrogen can be done using alkaline water electrolysis. Recycling water might help to fulfil the large water demand of hydrogen production facilities. In fertiliser production, steam condensate could be a recyclable water source for hydrogen production. This condensate is relatively clean as its main contaminant is a small...
master thesis 2023
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Deiters, Gilles (author)
In an effort to make water electrolysis more efficient and simple, flow-through electrolyzers eliminate the need for a gas-separating membrane between the electrodes. However, replacing the membrane with a forced flow field brings new challenges and considerations. In this research, the design of a flow-through electrolyzer is optimized for...
master thesis 2023
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Manna, Kris (author)
This master thesis introduces a recently surfaced method to produce hydrogen and oxygen using alkaline water electrolysis. A hydrophilic porous diaphragm is used that can feed electrolyte laterally to two porous electrodes that are placed against it. Consequently, hydrogen and oxygen are produced directly at the electrodes without any bubble...
master thesis 2023
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Pektaş, Mehmet (author)
A water electrolyzer is an electrochemical device that produces hydrogen and oxygen from water via electricity. A sustainable way of producing hydrogen with renewable electricity, also known as green hydrogen, could enable its use in decarbonisation of sectors that depend on fossil fuels. However, to scale up the production of green hydrogen,...
master thesis 2023
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Rajora, A. (author), Haverkort, J.W. (author)
Understanding multiphase flow close to the electrode surface is crucial to the design of electrolyzers, such as alkaline water electrolyzers for the production of green hydrogen. Vertical electrodes develop a narrow gas plume near their surface. We apply the integral method to the mixture model. Considering both exponentially varying and step...
journal article 2023
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Oikonomidis, Silvestros (author), Ramdin, M. (author), Moultos, O. (author), Bos, Albert (author), Vlugt, T.J.H. (author), Rahbari, A. (author)
Due to the intermittency of renewable energy sources, alkaline water electrolyzers are typically operated at partial load compared to the nominal design value. It is well-known that gas crossover is dominant at low current densities leading to higher anodic hydrogen content and higher cathodic oxygen content in the separator tanks. High...
journal article 2023
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Rajora, A. (author), Haverkort, J.W. (author)
Membraneless parallel-plate electrolyzers use electrolyte flow to avoid product crossover. Using a mixture model neglecting inertia, and assuming an exponential gas fraction profile, we derive approximate analytical expressions for the velocity profile and pressure drop for thin plumes. We verify these expressions using numerical solutions...
journal article 2022
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Hemamalini, S.S. (author)
Water electrolysis is a popular energy storage technique used in tandem with many renewable sources to convert the generated energy into storeable hydrogen. The efficiency of water electrolyzers is greatly affected by overpotential losses. Bubble evolution is a unique characteristic of flows in water electrolysis. The evolution of bubbles alter...
master thesis 2021
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KAROUNTZOS, JOHN (author)
The urgency of taking actions against climate crisis is unprecedented. The human-produced CO2 is the largest contributor to global warming, which drives the climate change. Many countries around the world have committed to net-zero greenhouse gas emissions in the next coming decades. Power-to-X (PtX) technologies in combination with carbon...
master thesis 2021
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Blommaert, M.A. (author)
Electrochemistry can be a useful technology to enable the transition toward renewable energy sources and to prevent further climate change. Some electrochemical applications are already industrially implemented, like water electrolysers, while others, like CO2 reduction, need further development to be industrially competitive. Here, a bipolar...
doctoral thesis 2021
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Haverkort, J.W. (author), Rajaei, H. (author)
Reducing the gap between the electrodes and diaphragm to zero is an often adopted strategy to reduce the ohmic drop in alkaline water electrolyzers for hydrogen production. We provide a thorough account of the current–voltage relationship in such a zero-gap configuration over a wide range of electrolyte concentrations and current densities....
journal article 2021
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Safwan Shurieh, Safwan (author)
In order to fight climate change, the EU is providing funds for knowledge development on water electrolysis technologies. Numerous projects have been funded so far, and an EU wide water electrolysis network has been formed, however, from an RTOs perspective, there is no overview of knowledge development and knowledge diffusion regarding the...
master thesis 2020
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Roobeek, Rogier (author)
The Port of Rotterdam has the vision to become a zero-emission port in 2050. At the mo- ment, the port area emits about 18% of Dutch CO2 emissions. Various studies have been conducted on how to reach this vision. Among others, the Wuppertal Institute has investig- ated what set of technologies in each scenario would be desirable to employ....
master thesis 2020
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Roobeek, Rogier (author)
Due to the abundance of solar energy resources in Oman and the participation in the joint venture of the Port of Rotterdam in the Port of Sohar, importing green hydrogen in the Port of Rotterdam has been suggested. In part one of this two-part research (Shipping Sunshine) two green hydrogen import prices were calculated based on a 100 [GW] solar...
master thesis 2020
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Haverkort, J.W. (author), Rajaei, H. (author)
Under alkaline conditions, hydroxide ions can deplete at the anode of a water electrolyser for hydrogen production, resulting in a limiting current density. We found experimentally that in a micro-porous separator, an electro-osmotic flow from anode to cathode lowers this limiting current density. Using the Nernst-Planck equation, a useful...
journal article 2020
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