Nano-structure Effect on Solid State Fuel Cells Cathode Durability

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.