固体氧化物燃料电池的纳米结构阴极的稳定性

Nano-structure Effect on Solid State Fuel Cells Cathode Durability

固体氧化物燃料电池的纳米结构阴极能够有效地提升电极的电化学性能以及电池的输出功率, 具有良好的应用前景。本文主要介绍纳米结构阴极的长期稳定性以及电极稳定性的理论模型。纳米结构阴极具有良好的长期稳定性。由于尺寸效应, 纳米结构能够抑制颗粒的高温生长, 并且可以显著减小电解质和催化剂之间热膨胀不匹配带来的微观应力, 使得两相之间保持良好的连接性。同时, 纳米结构能够很好地抵抗热循环导致的颗粒间界面断裂行为, 并在热循环中保持颗粒间的良好连接。La0.8Sr0.2MnO3-δ和La0.6Sr0.4Co0.2Fe0.8O3-δ等阴极材料在使用纳米结构技术后, 阴极性能提升了2.3~78倍, 并在超过1000 h的测试中保持稳定的功率输出。

Nano-structure could effectively enhance the electro-chemical properties of solid oxide fuel cell cathodes and the output power of single cells, which has a good application prospect. This article mainly focuses on the literatures reported about the long term stability of nano-structure cathode and electrode stability theoretical models. Nano-structure cathode has excellent stability at relatively low temperatures. Isothermal grain growth of nano-particles is self-limited because of the size effect. And nano-structure could significantly reduce the micro-strain induced by the misfit between electrolyte and electrocatalyst, which can keep the two phase in good contact. In addition, nano-structure can also weaken the interface break between two-phase particles in thermal cycle process. The performance of La0.8Sr0.2MnO3-δ and La0.6Sr0.4Co0.2Fe0.8O3-δ nano-structure cathodes increases by 2.3-78 times compared with traditional composites, and maintains a stable power output in 1000 h.