期刊
JOURNAL OF POWER SOURCES
卷 391, 期 -, 页码 94-105出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.04.080
关键词
Solid oxide fuel cell; Anode; Polarization resistance; Particle coarsening; Triple phase boundary; Prediction model of lifetime
资金
- International Cooperation Program through a Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korean Government Ministry of Trade, Industry AMP
- Energy, Republic of Korea [20148520120150]
- Technology Development Program to Solve Climate Changes under a National Research Foundation (NRF) grant - Korean government (Ministry of Science and ICT) [NRF-2017M1A2A2044926]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20148520120150] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2017M1A2A2044926] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The agglomeration of nickel (Ni) particles in a Ni-cermet anode is a significant degradation phenomenon for solid oxide fuel cells (SOFCs). This work aims to predict the performance degradation of SOFCs due to Ni grain growth by using a simplified approach. Accelerated aging of Ni-scandia stabilized zirconia (SSZ) as an SOFC anode is carried out at 900 degrees C and subsequent microstructural evolution is investigated every 100 h up to 1000 h using scanning electron microscopy (SEM). The resulting morphological changes are quantified using a twodimensional image analysis technique that yields the particle size, phase proportion, and triple phase boundary (TPB) point distribution. The electrochemical properties of an anode-supported SOFC are characterized using electrochemical impedance spectroscopy (EIS). The changes of particle size and TPB length in the anode as a function of time are in excellent agreement with the power-law coarsening model. This model is further combined with an electrochemical model to predict the changes in the anode polarization resistance. The predicted polarization resistances are in good agreement with the experimentally obtained values. This model for prediction of anode lifetime provides deep insight into the time-dependent Ni agglomeration behavior and its impact on the electrochemical performance degradation of the SOFC anode.
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