Abstract
Solid oxide electrolysis cells (SOECs) are highlighted as futuristic Power-to-gas (P2G) devices that can provide reliable supply of hydrogen gas as a renewable energy carrier. Despite the great potential of SOECs there are many challenges facing their commercialization. In this work we investigated the influence of fuel electrode and process parameters on initial SOEC performance (500 hours). Electrolysis experiments were performed with both GDC (gadolinia doped ceria)-infiltrated and un-infiltrated Ni-YSZ fuel electrode under various hydrogen flow rates with different ratios of H2-H2O mix, and current density including open circuit conditions. All cells marginally improve in performance initially, then undergo a brief period of rapid decay followed by a stable performance. The observed three stages of variations in cell performance, in terms of length of time and rate of change, are dependent on the type of fuel electrode and experimental process parameters used. These are investigated employing I-V measurements, electrochemical impedance spectroscopy (EIS), distribution of relaxation time (DRT), and microstructural characterization. The role of GDC infiltration and process parameters driving these performance variations and efficiency of hydrogen generation is analyzed in this work.
Published Version
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