How an angstrom-thick oxide overcoat enhances durability and activity of nanoparticle-decorated cathodes in solid oxide fuel cells
How an angstrom-thick oxide overcoat enhances durability and activity of nanoparticle-decorated cathodes in solid oxide fuel cells
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DOI：
10.1039/d0ta02915g
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发表时间：
2020-08-21
影响因子：
11.9
通讯作者：
Lee, Min Hwan
中科院分区：
文献类型：
--
作者：
Li, Haoyu;Kang, Hung-Sen;Lee, Min Hwan
在这份报告中，我们证明了一个均匀的埃级氧化物外涂层（氧化铈或氧化钇的标称厚度为0.7-1.5埃）的原子层沉积是非常有效的，不仅在提高底层渗透氧化铈纳米粒子的热稳定性，但也有利于电极动力学。通过采用无Sr电极和无Cr气体环境，我们专注于热团聚作为主要的降解途径，并揭示了渗透纳米粒子的热团聚速率和电极性能的降解速率之间的密切相关性，以定量的方式。我们还提供了一个机制的角度来看，涂层的耐久性和性能的固体氧化物燃料电池阴极的有益效果。
In this report, we demonstrate that a uniform angstrom-level oxide overcoat (either ceria or yttria with a nominal thickness of 0.7-1.5 angstrom) by atomic layer deposition is highly effective not only in enhancing the thermal stability of underlying infiltrated ceria nanoparticles but also in facilitating electrode kinetics. By employing Sr-free electrodes and Cr-free gas environment, we focus on the thermal agglomeration as the major degradation pathway and reveal the close correlation between thermal agglomeration rate of infiltrated nanoparticles and degradation rate of electrode performance in a quantitative manner. We also provide a mechanistic perspective on the beneficial effect of the overcoat in durability and performance of solid oxide fuel cell cathodes.