Transient characteristics of a solid oxide electrolysis cell under different voltage ramps: Transport phenomena behind overshoots

Liang, Zhaojian; Wang, Jingyi; Wang, Yan; Ni, Meng; Li, Mengying

doi:10.1016/j.enconman.2023.116759

Cited by 13 publications

(16 citation statements)

References 38 publications

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Section: The Raw Materials Of E-fuelsmentioning

confidence: 99%

“…41 Currently, the PV−PEM electrolysis method is the most commonly used, achieving a solar-to-hydrogen (STH) efficiency of approximately 9% with a maximum power point voltage (Vmpp) ranging from 24 to 32 V. 42 The use of triple junction solar cells with an effective area of 0.316 cm 2 effectively increases the contact area between the PV cells and the water electrolyzer, 43 thereby enhancing the STH efficiency to around 30%, as demonstrated in Figure 5. 44 Currently, the major obstacle in harnessing solar energy lies in the duration and intensity of sunlight exposure. 45 Regions that receive ample sunlight, such as Algeria and Egypt, are more suitable for solar power generation to produce ehydrogen.…”

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confidence: 99%

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Perspectives and Outlook of E-fuels: Production, Cost Effectiveness, and Applications

Shi,

Guan,

Zhuang

et al. 2024

Energy Fuels

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With the introduction of the EU's "ban on combustion" proposal in 2035, the sale of new fossil fuel vehicles will soon be comprehensively prohibited. The use of e-fuels has become the best means for the survival and continuation of internal combustion engines, while also responding to the call for carbon neutrality. This review studies how the raw materials required for different e-fuels can be obtained through the assistance of renewable energy or various net-zero carbon emission routes, and elaborates on the synthesis methods, economics, and challenges faced by e-fuels such as e-methanol and e-ammonia. E-fuels have a wide range of market applications, including but not limited to road transportation, aviation, and shipping, and some transportation vehicles have already chosen e-fuels as their fuel. By summarizing the technoeconomic analysis of e-fuels, this review aims to provide referable methods and multiple options for the future large-scale production of e-fuels, as well as insights for the subsequent application and improvement of e-fuels.

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Section: The Raw Materials Of E-fuelsmentioning

confidence: 99%

mentioning

confidence: 99%

Perspectives and Outlook of E-fuels: Production, Cost Effectiveness, and Applications

Shi,

Guan,

Zhuang

et al. 2024

Energy Fuels

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“…Further the response to temperature changes in startup operation [251][252][253] and for changing operation points [51] are investigated. [51,254] also examines the influence of an operating voltage varying in time while [255] studies the time-dependent distribution of the chemical potential of oxygen through the cell.…”

Section: Transient Behaviormentioning

confidence: 99%

High Temperature Solid Oxide Electrolysis – Technology and Modeling

Mueller,

Klinsmann,

Sauter

et al. 2023

Chemie Ingenieur Technik

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In the global quest to renounce from fossil fuels, a large demand for the renewable production of hydrogen via water electrolysis exists. In this context, the solid oxide electrolyzer (SOE) is an interesting technology due to its high efficiency resulting from elevated operating temperatures of up to 900 °C. Physical modeling plays a vital role in the development of SOEs, as it lowers experimental costs and provides insight where measurements reach limits. A main challenge for modeling SOEs is the multitude of physical effects, occurring and interacting on various spatial and temporal scales. This requires assumptions and simplifications, particularly when increasing scope and dimensions of a model. In this review, we discuss the different approaches currently available in literature.

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“…However, this perspective does not account for the significant effects of cell length 29 and inlet flow rates 20 , 25 on SOC transients. In contrast, other works 15 , 30 employed the convective time constant L cell / V in to characterize SOC transients, but this approach does not adequately explain the substantial impacts of electrode thickness and porosity 19 , 25 . In summary, the existing research does not adequately describe the relationship between SOC transients and their associated design and operating parameters.…”

Section: Introductionmentioning

confidence: 99%

“…When integrated with intermittent power sources, SOCs may frequently operate under fluctuating electrical conditions. The electrical response time of SOC is constrained by the slow heat and mass transfer processes within the cell 15 , 16 . Varying load changes may result in under-performance, thermal safety concerns, and degradation of SOCs 11 , 17 – 19 .…”

Section: Introductionmentioning

confidence: 99%

Discovering two general characteristic times of transient responses in solid oxide cells

Liang,

Wang,

Ren

et al. 2024

Nat Commun

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A comprehensive understanding of the transient characteristics in solid oxide cells (SOCs) is crucial for advancing SOC technology in renewable energy storage and conversion. However, general formulas describing the relationship between SOC transients and multiple parameters remain elusive. Through comprehensive numerical analysis, we find that the thermal and gaseous response times of SOCs upon rapid electrical variations are on the order of two characteristic times (τh and τm), respectively. The gaseous response time is approximately 1τm, and the thermal response time aligns with roughly 2τh. These characteristic times represent the overall heat and mass transfer rates within the cell, and their mathematical relationships with various SOC design and operating parameters are revealed. Validation of τh and τm is achieved through comparison with an in-house experiment and existing literature data, achieving the same order of magnitude for a wide range of electrochemical cells, showcasing their potential use for characterizing transient behaviors in a wide range of electrochemical cells. Moreover, two examples are presented to demonstrate how these characteristic times can streamline SOC design and control without the need for complex numerical simulations, thus offering valuable insights and tools for enhancing the efficiency and durability of electrochemical cells.

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Transient characteristics of a solid oxide electrolysis cell under different voltage ramps: Transport phenomena behind overshoots

Cited by 13 publications

References 38 publications

Perspectives and Outlook of E-fuels: Production, Cost Effectiveness, and Applications

Perspectives and Outlook of E-fuels: Production, Cost Effectiveness, and Applications

High Temperature Solid Oxide Electrolysis – Technology and Modeling

Discovering two general characteristic times of transient responses in solid oxide cells

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