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3. Development of Technical Specifications and Process System Requirements for the World’s Largest LH2 Refueling Station

Author

Han Seojin, Kim Yeowon, Choi Yunjeong, Jo Seunghyeon, Maletzko Annabelle, and Hwang Jihyun

Subjects
Environmental sciences, GE1-350
Abstract

Hydrogen is emerging as one of the premising energy sources to achieve carbon neutral society. To efficiently store and make use of the produced hydrogen by various methods, liquid hydrogen and liquid hydrogen refueling station (LHRS) are spotlighted as solutions for storage and utilization sector respectively. However, technical limitations of cryogenic pumps, heat exchangers and unconsolidated standards for LHRS led to hinder the wide spread of the stations. This paper reviews general technical specifications and safety standards of commercialized small-scale LHRS and suggests technical specifications and safety standards for large-scale LHRS. Especially, an application of separated cryogenic pumps and heat integration for the vaporizer specializes the designed station charging 1000kg of hydrogen per day in this paper from small-scale LHRS and other large-scale LHRS. The authors expect commercializing large-scale LHRS with the proposed technical specification and process system requirements to be able and the safety standards set for the designed station can contribute to the unification of world LHRS standards.

Published
2024
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4. Catalyst Interaction in Unitized Regenerative Fuel Cells

Author

Maletzko, Annabelle, primary, Gomez Villa, Eduardo Daniel, additional, Kintzel, Birgit, additional, Fietzek, Harald, additional, Schmidt, Gordon, additional, Christen, Jürgen, additional, Veit, Peter, additional, Kühne, Philipp, additional, Bornet, Aline, additional, Arenz, Matthias, additional, and Melke, Julia, additional

Published
2024
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6. Recycalyse – New Sustainable and Recyclable Catalytic Materials for Proton Exchange Membrane Electrolysers

Author

Melke, Julia, primary, Maletzko, Annabelle, additional, Gomez Villa, Eduardo Daniel, additional, Bornet, Aline, additional, Wiberg, Gustav K. H., additional, Arenz, Matthias, additional, Sandig-Predzymirska, Lesia, additional, Thiere, Alexandra, additional, Charitos, Alexandros, additional, Stelter, Michael, additional, Wang, Zhangqi, additional, Pitscheider, Simon, additional, Bertheussen, Erlend, additional, Pedersen, Christoffer M., additional, Finsdóttir, Sára, additional, Kokborg, Morten S., additional, Berman, Daniel G., additional, Dalvang, Simone, additional, Müller, Sebastian S., additional, Seidel, Fabian, additional, Seselj, Nedjeljko, additional, Höglinger, Martin, additional, Kartusch, Stefan, additional, Eder, Joshua, additional, Macherhammer, Marie, additional, Trattner, Alexander, additional, and Kallesøe, Christian, additional

Published
2024
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9. Influence of Temperature on the Performance of Carbon- and ATO-supported Oxygen Evolution Reaction Catalysts in a Gas Diffusion Electrode Setup

Author

Bornet, Aline, primary, Pittkowski, Rebecca, additional, Nielsen, Tobias M., additional, Berner, Etienne, additional, Maletzko, Annabelle, additional, Schröder, Johanna, additional, Quinson, Jonathan, additional, Melke, Julia, additional, Jensen, Kirsten M. Ø., additional, and Arenz, Matthias, additional

Published
2023
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10. Influence of Temperature on the Performance of Carbon- and ATO-supported Oxygen Evolution Reaction Catalysts in a Gas Diffusion Electrode Setup

Author

Bornet, Aline, Pittkowski, Rebecca, Nielsen, Tobias M., Berner, Etienne, Maletzko, Annabelle, Schröder, Johanna, Quinson, Jonathan, Melke, Julia, Jensen, Kirsten M. Ø., Arenz, Matthias, Bornet, Aline, Pittkowski, Rebecca, Nielsen, Tobias M., Berner, Etienne, Maletzko, Annabelle, Schröder, Johanna, Quinson, Jonathan, Melke, Julia, Jensen, Kirsten M. Ø., and Arenz, Matthias

Abstract

State-of-the-art industrial electrocatalysts for the oxygen evolution reaction (OER) under acidic conditions are Ir-based. Considering the scarce supply of Ir, it is imperative to use the precious metal as efficiently as possible. In this work, we immobilized ultrasmall Ir and Ir0.4Ru0.6 nanoparticles on two different supports to maximize their dispersion. One high-surface-area carbon support serves as a reference but has limited technological relevance due to its lack of stability. The other support, antimony-doped tin oxide (ATO), has been proposed in the literature as a possible better support for OER catalysts. Temperature-dependent measurements performed in a recently developed gas diffusion electrode (GDE) setup reveal that surprisingly the catalysts immobilized on commercial ATO performed worse than their carbon-immobilized counterparts. The measurements suggest that the ATO support deteriorates particularly fast at elevated temperatures.

Published
2023

11. Der Nationale Wasserstoffrat der deutschen Bundesregierung.

Author

Maletzko, Annabelle, Wurster, Sebastian, and Pinkwart, Karsten

Subjects
*GRAND strategy (Political science), *HYDROGEN
Abstract

To achieve the ambitious climate goals, the transition from fossil fuels to renewable resources is crucial. Hydrogen plays a central role in this. The German government adopted the National Hydrogen Strategy in June 2020 and appointed the National Hydrogen Council. The Council consists of 26 high‐ranking experts from industry, science, and civil society. Its task is to advise and support the State Secretary's Committee for Hydrogen by making proposals and recommendations for action in the implementation and further development of the strategy. [ABSTRACT FROM AUTHOR]

Published
2024
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14. New Concept of Electronically and Protonic Conductive Polymer Structures for the Proton Exchange Membrane Water Electrolysis Produced by 3D-Printing

Author

Maletzko, Annabelle, Melke, Julia, Hübner, Christof, and Höhne, Carl-Christoph

Subjects
Functional compounds, 3D printing, PTL Production
Abstract

The polymer electrolyte membrane (PEM) water electrolysis is a promising technology for the production of hydrogen from water using fluctuating renewable electricity sources. However, to achieve widespread application, the investment cost has to be lowered considerably. For optimal two-phase mass transport of gases and water, and to simultaneously ensure electron transfer, a porous transport layer (PTL) is used in PEM systems. Due to the highly oxidative conditions in the oxygen-evolving electrode, PTLs consists of porous titanium, sometimes coated with noble metals to increase corrosion stability. Polymer compounds offer a great potential in terms of cost-efficiency, material properties, which can be easily tailor-made by e.g. polymer additives, and in terms of individual shaping options during the component production in particular by additive manufacturing. However, the conditions in the electrolysis cells are challenging for polymeric materials, in particular for materials used in the oxygen-evolving electrode. Here, we present first steps to a new concept of electronically and protonic conductive polymer structures for the PEM water electrolysis produced by 3D-printing.

Published
2022
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