Abstract
Proton-conducting reversible solid oxide cell (RSOC) can efficiently store intermittent renewable energy in the form of hydrogen. The cell can operate in either SOFC mode or SOEC mode and achieve efficient and low cost energy storage. The RSOC needs a hydrogen storage equipment to reach enough energy storage capacity.In this study, a hydrogen storage alloy coupled proton-conducting reversible solid oxide cell is developed and functions as rechargeable battery. Experiments are performed at 500-650℃ using a Ni-BCZY/BCZY(BaCe0.5Zr0.4Y0.1O3)/LSM-BCZI micro-tubular cell and Zr-based hydrogen storage alloy. The hydrogen production and electrochemical performance are studied with different operating conditions and amount of hydrogen storage alloy. The current density ranges from -970A/m2 to -1230A/m2 for the SOEC mode, and from 960 A/m2 to 1300 A/m2 for the SOFC mode at a polarization voltage of 0.1 V with different gas compositions and temperatures. The hydrogen storage ranges from 0.4wt% to 1.4wt%.To further optimize the hydrogen storage alloy coupled RSOC, a muti-scale and muti-physics two-dimensional (2D) micro-tubular RSOC model is developed. This model couples the electrochemical reaction, charge transfer, mass transfer, momentum transfer, heat transfer as well as the parameters of microscale porous electrodes and the hydrogen alloy. The model is validated by the experimental data obtained above. The simulation results shows that the cell’s capacity and round trip efficiency are dependent on the amount of hydrogen storage alloy utilized. The energy capacity increases while the roundtrip efficiency decreases with increasing alloy utilization. A practical strategy to operate the new battery is to maintain a low alloy utilization and get a required storage capacity as well as a high efficiency. The model is demonstrated an useful tool for the design and optimization of the hydrogen storage alloy coupled RSOC.
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