Cui, Xiaoti

Jensen, Søren Højgaard

Sahlin, Simon Lennart

Simon Araya, Samuel

Zhong, Like

English

The electrolysis capacity has to been significantly expanded under the Net Zero Emission scenario1 to above 700 GW by 2030. However, the global electrolysis capacity currently is at a low level of 1–2 GW. This needs the acceleration of the developments for competitive electrolysis technologies. Solid oxide electrolyzer cells (SOE cells) is one of the main potential electrolysis technology which is still under maturing (TRL5-7)2,3. The primary challenge facing SOE technology is its limited stack lifetime, which typically only lasts around 20,000 hours in laboratory conditions2. This is still shorter than the stack lifetimes of Alkaline electrolyzer (60,000–90,000 h3) and Proton exchange membrane electrolyzer (PEM, 40,000–80,000 h, information provided by suppliers). In addition, the scale-up for SOE electrolyzer is another obstacle to the large-scale implementation and commercialization of this technology. Currently, the cell (active area) and single stack size are at the levels of 100 cm2 and 12.5 kW2, respectively, which are much lower than those of the commercialized alkaline electrolyzer (scale in MW) and PEM electrolyzer (scales in hundreds of kW).This work investigated the dynamic operation method for SOE named “AC:DC”, which has been proposed in recent times and proved to effectively address the two challenges mentioned above4,5. The results of both experimental and modeling studies on SOE cell under AC:DC operations are presented. The potentials of AC:DC in improving lifetime and temperature variations for SOE cell are discussed.<br/

    Aalborg UniversitetInvestigation on AC:DC dynamic operations for solid oxide electrolysis cellsCui, Xiaoti; Jensen, Søren Højgaard; Zhong, Like; Sahlin, Simon Lennart; Simon Araya,SamuelPublication date:2023Document VersionEarly version, also known as pre-printLink to publication from Aalborg UniversityCitation for published version (APA):Cui, X., Jensen, S. H., Zhong, L., Sahlin, S. L., & Simon Araya, S. (2023). Investigation on AC:DC dynamicoperations for solid oxide electrolysis cells. Abstract from the Fourth International Conference on Electrolysis, Sun City , South Africa.General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            - Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            - You may not further distribute the material or use it for any profit-making activity or commercial gain            - You may freely distribute the URL identifying the publication in the public portal -Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access tothe work immediately and investigate your claim.Downloaded from vbn.aau.dk on: September 08, 2023Investigation on AC:DC dynamic operations for solid oxide electrolysis cells  Xiaoti Cuia, Søren Højgaard Jensena,b, Like Zhonga,c, Simon Lehnart Sahlina, Samuel Simon Arayaa aDepartment of Energy, Aalborg University, Denmark; bDynElectro ApS, Denmark; cSchool of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China xcu@energy.aau.dk Abstract  The electrolysis capacity has  to been significantly expanded under  the Net Zero Emission scenario1  to above 700 GW by 2030. However, the global electrolysis capacity currently is at a low level of 1–2 GW. This needs the acceleration of the developments  for competitive electrolysis technologies. Solid oxide electrolyser cells (SOE or SOEC) is one of the main potential electrolysis technology which  is still under maturing  (TRL5‐7)2,3.  The  primary  challenge  facing  SOE  technology  is  its  limited  stack  lifetime, which typically  only  lasts  around  20,000  hours  in  laboratory  conditions2.  This  is  still  shorter  than  the  stack lifetimes of Alkaline electrolyzer (60,000–90,000 h3) and Proton exchange membrane electrolyzer (PEM, 40,000–80,000 h,  information provided by  suppliers).  In addition,  the  scale‐up  for  SOE electrolyzer  is another obstacle to the large‐scale implementation and commercialization of this technology. Currently, the cell (active area) and single stack size are at the levels of 100 cm2 and 12.5 kW2, respectively, which are much lower than those of the commercialized alkaline electrolyzer (scale in MW) and PEM electrolyzer (scales in hundreds of kW). This work investigated the dynamic operation method for SOE named “AC:DC”, which has been proposed in recent times and proved to effectively address the two challenges mentioned above4,5. The results of both  experimental  and  modeling  studies  on  SOE  cell  under  AC:DC  operations  are  presented.  The potentials of AC:DC in improving lifetime and temperature variations for SOE cell are discussed.  Acknowledgment This research is part of the MESH project, which has been supported by Innovation Fund Denmark (Grant No. 0143‐00023B). References (1)  International Energy Agency. Net zero emissions by 2050 Scenario. https://www.iea.org/reports/electrolysers (accessed 2023‐03‐18). (2)  Hauch, A.; Küngas, R.; Blennow, P.; Hansen, A. B.; Hansen, J. B.; Mathiesen, B. V.; Mogensen, M. B. Recent Advances in Solid Oxide Cell Technology for Electrolysis. Science (80‐. ). 2020, 370 (6513), eaba6118. (3)  Schmidt, O.; Gambhir, A.; Staffell, I.; Hawkes, A.; Nelson, J.; Few, S. Future Cost and Performance of Water Electrolysis: An Expert Elicitation Study. Int. J. Hydrogen Energy 2017, 42 (52), 30470–30492. https://doi.org/10.1016/J.IJHYDENE.2017.10.045. (4)  Jensen, S. H.; Graves, C. R.; Mogensen, M. B. Electrolysis System with Controlled Thermal Profile. Google Patents June 30, 2022. (5)  Skafte, T. L.; Rizvandi, O. B.; Smitshuysen, A. L.; Frandsen, H. L.; Høgh, J. V. T.; Hauch, A.; Kær, S. K.; Araya, S. S.; Graves, C.; Mogensen, M. B. Electrothermally Balanced Operation of Solid Oxide Electrolysis Cells. J. Power Sources 2022, 523, 231040. 

Investigation on AC:DC dynamic operations for solid oxide electrolysis cells

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Investigation on AC:DC dynamic operations for solid oxide electrolysis cells

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