Publication date: 10th April 2024
Nowadays, climate changes attributed to the continuous and excessive consumption of carbon-based fossil fuels are causing escalating concerns, leading to a growing demand for sustainable energy technologies. However, the intermittent nature of many renewable energy sources, such as wind and solar, necessitates the development of reliable energy storage technologies. Among the most promising technologies, solid oxide electrolysis cells (SOECs) can convert electrical energy into chemical energy at high operating temperatures (typically 500-1000 ℃), offering the advantage of achieving higher efficiency and lower capital expenditures [1]. Despite their potential, SOECs are not without challenges. The performance of state-of-the-art cells tends to degrade over time, with a significant portion of this degradation originating from the Ni/ytttria-stabilized zirconia (YSZ) electrode [2]. This study aims to investigate the influence on electrochemical performance and microstructure of Ni/YSZ fuel electrode based SOEC, by adding two common impurities, namely Si and Al. As refractory compounds, silica and alumina are frequently used in SOEC systems at both laboratory and industry scales, serving various roles including glass sealing, insulation, and as parts in vacuum pumps and heating elements to mention a few [3,4]. Alumina is also used as a sintering aid in SOEC cells to reduce the sintering temperature [5]. In this study, a Ni contact layer containing alumina and silica was applied on the top of fuel electrode, to mimic accelerated degradation caused by Si/Al impurities. The electrochemical performance and microstructure information were investigated in detail and compared with a cell without such contaminated layer. Based on the results, possible explanation on the mechanism of Si/Al poisoning the Ni/YSZ SOEC cathode was provided.
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