Abstract
Reversible solid oxide cell technology is of increasing interest and is emerging as a promising grid-flexible support system [1] with storage [2]. Among the types of cell architecture available, electrolyte-supported cells have proven to be better in terms of long-term stability and degradation of the cell, albeit sacrificing on performance as compared to anode-supported cells [3]. This makes electrolyte-supported cells better suited architecture to be used in reversible systems where higher stability is required due to the changing operating conditions in each mode. In the present work, validated cell and stack models of Nexceris electrolyte-supported cells are used to model a full-scale reversible solid oxide system designed for hydrogen production.EIS data from symmetric button cells and polarization curves from 5cm×5cm full cells are used to validate the stack model. A net 100 kWe system in fuel cell mode is modelled with electrolyte-supported stacks from Nexceris operating at a nominal temperature of 800 oC. The system is run at thermoneutral conditions in electrolysis mode and at 0.5 A/cm2 in fuel cell mode to balance between efficiency and hydrogen production. The levelized cost of hydrogen production is calculated using a price-taker model with the system pumping the produced hydrogen into a natural gas/hydrogen pipeline. The effect of various parameters, such as the capacity factor of the system, the operating pressure, grid-electricity pricing, etc. - are investigated on the levelized cost of hydrogen.[1] Guenther Glenk and Stefan Reichelstein, “Reversible Power-to-Gas systems for energy conversion and storage”, Nature Communications 13, 2010 (2022).[2] Evan Reznicek and Robert J. Braun, “Techno-economic and off-design analysis of stand-alone, distributed-scale reversible solid oxide cell energy storage systems”, Energy Conversion and Management 175, 2018.[3] Marco A. Buccheri, Anand Singh, and Josephine M. Hill, “Anode- versus electrolyte-supported Ni-YSZ/YSZ/Pt SOFCs: Effect of cell design on OCV, performance and carbon formation for the direct utilization of dry methane”, Journal of Power Sources 196, 2011. Figure 1
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