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Book Part Hydrogen Production: Electrolysis Methods(Elsevier, 2025) Celebi, C.; Altınışık, H.; Atak, Y.N.; Çolpan, C.; Devrim, Y.Electrolyzers are at the forefront of sustainable energy technologies, which are important in converting electrical energy into storable and transportable chemical energy. Electrolyzers enable the production of environmentally friendly green hydrogen using excess electricity from renewable sources, thereby reducing outage problems and facilitating grid balancing. Furthermore, using hydrogen as an energy carrier has great potential for decarbonizing hard-to-decarbonize sectors such as heavy industry, aviation and shipping. This chapter provides a comprehensive overview of electrolyzers, covering their basic principles, their various types and their significant importance in the transition to a greener energy environment. The chapter first discusses the basic operation of electrolyzers and explains the electrochemical processes involved in decomposing water molecules into hydrogen and oxygen gases. Each type of electrolyzer is discussed in detail, highlighting their unique features, efficiency, scalability, and technological advancements. Comparative analysis between electrolyzer types provides insights into their suitability for various applications and deployment scenarios. In conclusion, this chapter highlights the critical role of electrolyzers in enabling the hydrogen economy and advocates for continued research, development and deployment efforts to harness their full potential in moving towards a sustainable and carbon-neutral future. © 2025 Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies.Conference Object Citation - WoS: 76Citation - Scopus: 92Modeling and Simulation of a Hybrid Photovoltaic (pv) Module-Electrolyzer Fuel Cell System for Micro-Cogeneration Applications(Pergamon-elsevier Science Ltd, 2015) Ozgirgin, Ekin; Devrim, Yilser; Albostan, AyhanThe rising cost of energy and power, depreciation of natural resources like fossil fuels and the global warming issues have all led the need for developing advanced clean energy systems. Hydrogen, which is clean energy carrier, can be produced by using solar electric energy from photovoltaic (PV) modules for the water electrolysis without emitting carbon dioxide. Modeling of PV module-electrolyzer hydrogen system is important for their planning and control strategies in many applications. In this respect, high-efficiency cogeneration systems for producing both heat and electricity coupled with clean energy sources such as PVs and fuel cells are gaining more attention, due to their advantages in terms of increasing efficiency and power quality, reducing harmful emissions and flexibility of operation. This study describes the analysis of the PV module-fuel cell hybrid system for house-hold micro co-generation applications. The system consists of PV modules, batteries, proton exchange membrane type water electrolyzer and proton exchange membrane fuel cell (PEMFC). The excess heat of PEMFC was used to supply hot water and/or heating energy of the house. Electrical energy was stored in the batteries. The analysis of the PV-electrolyzer-PEMFC system can be further used for designing co-generation systems for various application optimizing the PV module, electrolyzer and PEMFC sizes. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
