Hussain A Mohammed, Huang Yi-Lin, Pan Ke-Ji, Robinson Ian A, Wang Xizheng, Wachsman Eric D
Maryland Energy Innovation Institute, University of Maryland, College Park, Maryland 20742, United States.
Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742,United States.
ACS Appl Mater Interfaces. 2020 Apr 22;12(16):18526-18532. doi: 10.1021/acsami.0c01611. Epub 2020 Apr 7.
A critical factor hampering the deployment of fuel-flexible, low-temperature solid oxide fuel cells (LT-SOFCs) is the long-term stability of the electrode in different gas environments. Specifically, for state-of-the-art Ni-cermet anodes, reduction/oxidation (redox) cycles during fuel-rich and fuel-starved conditions cause a huge volume change, eventually leading to cell failure. Here, we report a robust redox-stable SrFeCoMoO (SFCM)/CeGdO ceramic anode-supported LT-SOFC with high performance and remarkable redox stability. The anode-supported configuration tackles the high ohmic loss associated with conventional ceramic anodes, achieving a high open circuit voltage of ∼0.9 V and a peak power density of 500 mW/cm at 600 °C in hydrogen. In addition, ceramic anode-supported SOFCs are stable over tens of redox cycles under harsh operating conditions. Our study reveals that oxygen nonstoichiometry of SFCM compensates for the dimensional changes that occur during redox cycles. Our results demonstrate the potential of all ceramic cells for the next generation of LT-SOFCs.
阻碍燃料灵活的低温固体氧化物燃料电池（LT-SOFC）部署的一个关键因素是电极在不同气体环境中的长期稳定性。具体而言，对于最先进的镍基金属陶瓷阳极，在富燃料和贫燃料条件下的还原/氧化（redox）循环会导致巨大的体积变化，最终导致电池失效。在此，我们报告了一种具有高性能和显著氧化还原稳定性的坚固的氧化还原稳定的SrFeCoMoO（SFCM）/CeGdO陶瓷阳极支撑的LT-SOFC。阳极支撑结构解决了与传统陶瓷阳极相关的高欧姆损耗问题，在600°C的氢气中实现了约0.9 V的高开路电压和500 mW/cm²的峰值功率密度。此外，陶瓷阳极支撑的SOFC在苛刻的操作条件下经过数十次氧化还原循环仍保持稳定。我们的研究表明，SFCM的氧非化学计量比补偿了氧化还原循环过程中发生的尺寸变化。我们的结果证明了全陶瓷电池在下一代LT-SOFC中的潜力。
