Co-Electrolysis with CFY-Stacks

Dosch, Christian; Rothe, Stefan; Folgner, Christoph; Trofimenko, Nikolai; Rost, Axel; Kusnezoff, Mihails; Reichelt, Erik; Jahn, Matthias; Michaelis, Alexander; Bienert, Christian; Brandner, Marco

doi:10.1149/07801.3089ecst

Cited by 27 publications

(29 citation statements)

References 21 publications

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“…When HER and OER decoupling agents are concurrently utilized, cathodic and anodic electrolytes are constantly circulated between electrolysis cells to be reduced or oxidized, and external catalysis beds to be converted into their initial states. Dual-circuit decoupled alkaline electrolysis systems employing 7,8-dihydroxy-2-phenazinessulfonic acid (DHPS)/DHPS-2H and [Fe(CN) 6 ] 4– /[Fe(CN) 6 ] − …”

Section: Elevated Temperature Alkaline Electrolysis Cells (Et-aecs)mentioning

confidence: 99%

“…Based on the multiple reversible redox reactions, phosphotungstic acid [P 2 W 18 O 62 ] (6+ n )– (0 ≤ n ≤ 18) exhibited a capacity to store up to 18 electrons and protons according to practical concentrations, which allowed a facile HER by simply diluting the solution . A strategy for tuning the redox property of ECPB was also presented by substituting the heteroatom to generate [ZnW 12 O 40 ]. − …”

Section: Elevated Temperature Polymer Electrolyte Membrane Electrolys...mentioning

confidence: 99%

“…Temperature ranges and representative examples of ET-AECs (Reproduced with permission from ref , Copyright 2016 The Electrochemical Society under CC BY 4.0 ), ET-PEMECs (Reproduced with permission from ref , Copyright 2021 Elsevier), ET-ICs ((top) Reproduced with permission from ref , Copyright 2018 Springer; (bottom right) Reproduced with permission from ref , Copyright 2020 The Electrochemical Society under CC BY 4.0 ; (bottom left) Reproduced with permission from ref , Copyright 2015 Elsevier), PCECs (Reproduced with permission from ref , Copyright 2021 Elsevier) and SOECs (Reproduced with permission from ref , Copyright 2017 The Electrochemical Society).…”

Section: Introductionmentioning

confidence: 99%

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Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

et al. 2023

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Since severe global warming and related climate issues have been caused by the extensive utilization of fossil fuels, the vigorous development of renewable resources is needed, and transformation into stable chemical energy is required to overcome the detriment of their fluctuations as energy sources. As an environmentally friendly and efficient energy carrier, hydrogen can be employed in various industries and produced directly by renewable energy (called green hydrogen). Nevertheless, large-scale green hydrogen production by water electrolysis is prohibited by its uncompetitive cost caused by a high specific energy demand and electricity expenses, which can be overcome by enhancing the corresponding thermodynamics and kinetics at elevated working temperatures. In the present review, the effects of temperature variation are primarily introduced from the perspective of electrolysis cells. Following an increasing order of working temperature, multidimensional evaluations considering materials and structures, performance, degradation mechanisms and mitigation strategies as well as electrolysis in stacks and systems are presented based on elevated temperature alkaline electrolysis cells and polymer electrolyte membrane electrolysis cells (ET-AECs and ET-PEMECs), elevated temperature ionic conductors (ET-ICs), protonic ceramic electrolysis cells (PCECs) and solid oxide electrolysis cells (SOECs).

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Section: Elevated Temperature Alkaline Electrolysis Cells (Et-aecs)mentioning

confidence: 99%

Section: Elevated Temperature Polymer Electrolyte Membrane Electrolys...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

et al. 2023

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“…[12][13][14] Moreover, the increasing need for energy storage via H 2 has fostered the research activities concerning SOC stack degradation in reversible SOFC/SOEC cycling operation mode. [15][16][17][18][19][20][21][22][23][24][25][26][27][28] However, the published stack degradation results during reversible cycling operation and the interpretations differ strongly from each other. The corresponding power degradation values in SOFC mode range from −0.5%/kh to −22%/kh and in SOEC mode from +0.1%/kh to +68%/kh.…”

Section: Challenges Of Reversible Sofc/soec Stack Operationmentioning

confidence: 99%

Analysis of Electrochemical Degradation Phenomena of SOC Stacks Operated in Reversible SOFC/SOEC Cycling Mode

Lang,

Lee,

Lee

et al. 2023

J. Electrochem. Soc.

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In recent years the degradation rates of high temperature stacks with solid oxide cells (SOC) during steady-state long-term operation in fuel cell (SOFC) and electrolysis (SOEC) mode have been steadily decreased. In contrast, the quantification and understanding of degradation mechanisms of SOC stacks during reversible SOFC/SOEC cycling operation still remains a challenging issue. Therefore, the present paper focusses on the detailed analysis and discussion of degradation phenomena of two SOC stacks during galvanostatic steady-state SOFC and reversible SOFC/SOEC cycling operation. The stacks with fuel electrode supported cells of Elcogen (Estonia) were fabricated by the industrial project partner E&KOA (Daejeon, Korea) within the Korean-German project “Solid Oxide Reversible Fuel Cell/Electrolysis Stack” (SORFES). The first 10-cell stack was tested at DLR during 1400 h and the results were used to improve the second 6-cell stack, which was operated at E&KOA during 2800 h. For electrochemical characterization jV-curves and electrochemical impedance spectroscopy were measured. The results between galvanostatic steady-state SOFC operation and reversible SOFC/SOEC cycling are compared. The degradation of the open circuit voltages, the performances and the resistances of the individual repeat units are presented and discussed. Moreover, possible degradation mechanisms are outlined.

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“…In recent years, Solid Oxide Cell (SOC) technology has gained significant attention. [1][2][3][4][5][6][7][8][9] Besides the activities in the pure fuel cell (SOFC) or electrolysis (SOEC) operation, significant successes have also been achieved in the development and simulation of reversible Solid Oxide Cells (rSOC). The Technical University of Denmark (DTU) showed that this technology can convert electricity via electrolysis into hydrogen, whereby this hydrogen can later be converted back into electrical energy on demand.…”

mentioning

confidence: 99%

Experimental Results of a 10/40 kW-Class Reversible Solid Oxide Cell Demonstration System at Forschungszentrum Jülich

Peters

Tiedemann

Hoven

et al. 2023

J. Electrochem. Soc.

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In 2018, a 5/15 kWDC reversible solid oxide cell system was developed and successfully operated by Forschungszentrum Jülich. Based on the knowledge gained with this first system, an optimized system in the power class of 10/40 kWAC was developed afterwards in 2019 that uses the well-established Integrated Module. This represents the main components of the system. The basic system layout was retained in general from the previous system and adjusted in accordance with the higher power level. During the experimental evaluation in fuel cell mode, the system could provide an electrical output power from 1.7 to 13 kWAC. The maximum system efficiency of 63.3 % based on the lower heating value (LHV) could be reached at a system power of 10.4 kWAC. In electrolysis mode, a maximum efficiency of 71.1 % (LHV) was achieved with an electrical power input of - 49.6 kWAC. At this operating point, about 11.7 Nm³ h-1 of hydrogen are generated. The stack temperature distribution and the efficiency losses are also analyzed for the electrolysis mode. Finally, the potential for the efficiency optimization through higher heat integration in this mode is experimentally evaluated and discussed.

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Co-Electrolysis with CFY-Stacks

Cited by 27 publications

References 21 publications

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

Analysis of Electrochemical Degradation Phenomena of SOC Stacks Operated in Reversible SOFC/SOEC Cycling Mode

Experimental Results of a 10/40 kW-Class Reversible Solid Oxide Cell Demonstration System at Forschungszentrum Jülich

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