Patent ID: 9404885
Filing Date: 2016-08-02
CPC Classification: G01N

Claim Text:
1. An amperometric gas sensor for determining oxygen content in a gas mixture, comprising: a solid-state electrolyte; a first electrode configured as a cathode and a second electrode configured as an anode disposed on the solid-state electrolyte and exposed to the gas mixture, the cathode being in contact with the gas mixture without any interposed diffusion barrier and having a design such that a flow of oxygen molecules from the gas mixture to a three-phase boundary between the solid-state electrolyte, the cathode and the gas mixture is limited in a defined manner, wherein the cathode is configured to have a low electrochemical activity during conversion of oxygen molecules to oxygen ions and the anode is configured to have a high electrochemical activity during conversion of oxygen ions to oxygen molecules, and wherein the electrochemical activities of the anode and the cathode differ by a factor of at least 10; a voltage source configured to apply a DC voltage between the electrodes; and a measuring device configured to measure a limiting current flowing between the electrodes as a measure of the oxygen content in the gas mixture.