期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 1, 页码 457-468出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b04748
关键词
protonic ceramic fuel cells; operation protocols; degradation mechanisms; degradation prevention method; durability
资金
- Midcareer Researcher through the National Research Foundation of Korea [NRF-2017R1A2A2A05069812]
- Industrial Technology Innovation R&D Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy, Republic of Korea [20173010032290, 20153010031940]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20173010032290, 20153010031940] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
To develop reliable and durable protonic ceramic fuel cells (PCFCs), the impacts of the operation protocols of PCFCs on the cell durability are investigated through analyses of the main degradation mechanisms. We herein propose three appropriately designed control protocols, including cathode air depletion, shunt current, and fuel cell/electrolysis cycling, to fully circumvent the operating-induced degradation of PCFCs. For this purpose, anode-supported cells, comprised of a NiO-BaCe0.7Zr0.1Y0.1Yb0.1O3-delta anode, BaCe0.7Zr0.1Y0.1Yb0.1O3-delta electrolyte, and NdBa0.5Sr0.5Co1.5Fe0.5O5+delta Nd0.1Ce0.9O2-delta composite cathode, are prepared, and their long-term performances are evaluated under a galvanostatic condition of 0.5 A.cm(-2) at 650 degrees C. The cell voltages of the protected cells using the operation protocols to prevent performance degradation are stably maintained under the applied current density for more than 1200 h without any noticeable degradation, whereas the performance of the unprotected cell gradually decreased with time, and the decay ratio was 14.9% over 850 h. The significant performance decay of the unprotected cell is strongly associated with the cathode degradation phenomenon, which was caused by the water vapor continuously produced during the electrochemical reactions. Hence, the performance recovery of the PCFCs with the operation protocols is achieved by incrementally decreasing the cathode potential (close to a value of zero) to minimize the effect of high P-H2O and P-O2 during the PCFC operations.
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