Operation Protocols To Improve Durability of Protonic Ceramic Fuel Cells.
Operation Protocols To Improve Durability of Protonic Ceramic Fuel Cells.
复制标题
提高质子陶瓷燃料电池耐用性的操作协议。
DOI：
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发表时间：
2018
影响因子：
9.5
通讯作者：
Jun
中科院分区：
文献类型：
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作者：
Ka;You;John;M. Saqib;Ji;Y. Seo;J. H. Kim;Hyung;Jun
为了研制可靠耐用的质子陶瓷燃料电池，通过分析质子陶瓷燃料电池的主要降解机理，研究了质子陶瓷燃料电池的操作方式对电池耐久性的影响。本文提出了三种适当设计的控制方案，包括阴极空气耗尽、分流电流和燃料电池/电解循环，以完全避免操作引起的pcfc降解。为此，制备了由NiO-BaCe0.7Zr0.1Y0.1Yb0.1O3-δ阳极、BaCe0.7Zr0.1Y0.1Yb0.1O3-δ电解质和NdBa0.5Sr0.5Co1.5Fe0.5O5+δ-Nd0.1Ce0.9O2-δ复合阴极组成的阳极支撑电池，并在0.5 a·cm-2、650℃的恒流条件下对其长期性能进行了评价。采用防止性能下降的操作方案的保护电池的电池电压在施加电流密度下稳定保持1200 h以上，没有明显的下降，而未保护电池的性能随着时间的推移逐渐下降，在850 h内衰减率为14.9%。未保护电池的显著性能衰减与阴极降解现象密切相关。这是由电化学反应过程中不断产生的水蒸气引起的。因此，通过逐步降低阴极电位（接近零值）来实现PCFC在操作过程中的性能恢复，以最大限度地减少高PH2O和PO2的影响。
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-δ anode, BaCe0.7Zr0.1Y0.1Yb0.1O3-δ electrolyte, and NdBa0.5Sr0.5Co1.5Fe0.5O5+δ-Nd0.1Ce0.9O2-δ composite cathode, are prepared, and their long-term performances are evaluated under a galvanostatic condition of 0.5 A·cm-2 at 650 °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 PH2O and PO2 during the PCFC operations.
影响因子：
56.7
作者：
Choi, Sihyuk;Kucharczyk, Chris J.;Haile, Sossina M.
通讯作者：
Haile, Sossina M.