Gas sensor element for determining oxygen concentration in internal combustion engine exhaust gas has electrode on measuring gas side covered with porous protective layer containing heat resistant metal oxide and alkali silicate

摘要

Gas sensor element comprises a solid electrolyte (10), an electrode (12) in contact with measuring gas, and an electrode (11) in contact with reference gas. The electrode on the measuring gas side is covered with a porous protective layer (14) containing a heat resistant metal oxide and an alkali silicate or silicon oxide as getter. An Independent claim is also included for a process for the production of a gas sensor element.