MICROSTRUCTURE AND ELECTRICAL CONDUCTIVITY OF NI/YSZ CERMETS FOR SOFC

摘要

To improve Ni network structure in Ni/YSZ cermet anode, the effect of particle sizes of Ni and YSZ on microstructural evolution, electrical conductivity, and porosity of Ni/YSZ cermets has been investigated. Ni particles with submicron order have been incorporated into YSZ matrix by using nickel nitrate as one of the starting materials. The formation of small-sized Ni particles not only promotes the development of a continuous Ni network in Ni/YSZ cermets and causes improvement in electrical conductivity, but also leads to increase in porosity. When pre-calcined coarse YSZ powder is incorporated into Ni/YSZ cermets, continuous Ni network is easily formed, which contributes to the improvement in electrical conductivity and porosity as well.