TUNING OF ION MOBILITY IN CERIA-CONTAINING MATERIALS

摘要

An oxygen storage (17) comprises a volume (21) of a ceria-containing material, and means (31) for applying an external field (28) over the volume (21). The external field (28) gives rise to an increased ion mobility in the volume (21). The external field (28) comprises preferably an electric field, but may also comprise a magnetic field. The electric field has preferably a field strength giving a potential difference of at least IV over the ceria-containing material volume (21). The oxygen storage (17) is advantageously comprised in a catalyst device (10), an oxygen sensor, or a fuel cell. Also, a method of tuning ion mobility in a volume (21) of a ceria-containing material comprises the step of applying an external field (28) over the volume (21). Furthermore, the tuning of ion mobility can further be utilised in a method of restoring a volume (21) of a ceria-containing material from contaminations.