Publication date: 10th April 2024
In the pursuit of sustainable energy solutions, the development of solid oxide cells (SOCs) for electrolysis and hydrogen production has emerged as a promising frontier [1]. Nevertheless, for SOCs to succeed in the industrial scale, one pressing challenge must be surmounted: long-term stability of the components, being one major concern the active nickel depletion at fuel electrodes in electrolysis operation [2].
In a frame of rising geopolitical stress and climate crisis is mandatory to increase the efforts in working with more available materials and low emission processes of extraction. Our proposal is to optimize Ni-based fuel electrode supported cells in order to minimize high footprint elements content and the cell economical cost [3].
To fulfill this objective, a comprehensive study on the degradation mechanism is being carried out, part of this study is presented in this work. Complete cells, consisting of a NiO-YSZ fuel electrode, a YSZ electrolyte and a LSM-YSZ oxygen electrode, were subjected to accelerated degradation conditions: at least 50% of relative steam humidity and high DC current densities (in the range of 1 Acm-2), for an extended period of 100 hours. Area specific resistance (ASR) evolution with time is recorded during the experiment. Electrochemical impedance spectroscopy (EIS) and current-voltage plots are obtained in different stages of the degradation experiment. The electrochemical information along with post-mortem SEM images confirm the good stability and connectivity of the fuel electrodes fabricated in our facilities.
This research was supported by MCIN with funding from NextGenerationEU (PRTR-C17.I1) within the Planes Complementarios con CCAA (Area of Green Hydrogen and Energy) and it has been carried out in the CSIC Interdisciplinary Thematic Platform (PTI+) Transición Energética Sostenible+ (PTI-TRANSENER+). We acknowledge the financial support from the Departamento de Ciencia, Universidad y Sociedad del Conocimiento del Gobierno de Aragón to Research Group T02_23R.
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