mixedionic

Mixedionic refers to a class of materials that exhibit both ionic and electronic conductivity. This dual nature distinguishes them from purely ionic conductors, which only allow the movement of ions, and purely electronic conductors, which only allow the movement of electrons. In mixed ionic-electronic conductors (MIECs), both charge carriers coexist and contribute to the overall electrical transport.

The ionic conductivity in MIECs arises from the mobility of ions within the material's crystal lattice or amorphous structure. This mobility is typically facilitated by vacancies, interstitial sites, or diffusion pathways. The electronic conductivity, on the other hand, stems from the movement of electrons or holes, similar to metals or semiconductors. The interplay between these two transport mechanisms is crucial for the functionality of MIECs in various applications.

MIECs are of significant interest due to their potential use in electrochemical devices. Their ability to conduct both ions and electrons simultaneously allows for efficient charge transfer across interfaces, which is essential for processes like catalysis and energy conversion. Applications include solid oxide fuel cells (SOFCs), where MIECs serve as electrodes and electrolytes, enabling the electrochemical reaction of fuel and oxidant. They are also explored for oxygen separation membranes, chemical sensors, and electrocatalytic reactors. The development and understanding of MIECs are ongoing areas of research, focusing on optimizing their conductivity, stability, and performance for these advanced technological applications.