the solid-state ion and new energy technology to put forward a kind of team innovation, thermal expansion compensation strategy, implements the fuel cell cathode with other battery fully thermal mechanical compatibility between components, so as to solve the obstacles to the process of solid oxide fuel cell (sofc) commercializing a big technical difficult problem. This breakthrough recently on top international journal nature.
Mechanical instability "hot" refers to a solid oxide fuel battery run time at high temperature, the battery does not match the thermal expansion behavior between different components, will cause a larger internal strain gradient, stress is not the same in different places, leading to cell degeneration, layered or broken." Team professor zhou is introduced, due to the excellent REDOX catalytic activity and high electrical conductivity, the fuel cell is one of the most popular cathode materials containing cobalt perovskite oxides, however drill base perovskite cathode of the problem is that their thermal expansion coefficient is very high, is far greater than the commonly used electrolyte, cause thermal mechanical is not compatible.In order to greatly reduce the thermal expansion coefficient of cobalt-based electrode, negative influences and no oxygen reduction reaction, south university professor Shao Zong peace week ghost team thermal expansion compensation strategy is put forward to overcome the technical bottleneck: through the solid phase sintering, the drill base with high electrochemical activity and thermal expansion coefficient of perovskite and negative thermal expansion materials together, triggered a useful interface reaction between the two, thus forming a good matching of thermal expansion properties of the composite electrode with the electrolyte.
