Electrodes, electrochemical elements, gas sensors, and gas measurement methods

摘要

Electrode having high activity to oxygen gas and low activity to flammable gas is provided. An oxygen pump includes oxide-ion conductive solid electrolyte 2 , electrode 8 which is an inactive electrode, and active electrode 10 . Electrode 8 is an electrode that includes Ce_0.8Sm_0.2O_2-alpha. Electrode 8 is disposed on the gas detection chamber 12 side of solid electrolyte 2 . Active electrode 10 is disposed on the open space side of solid electrolyte 2 . Gas detection chamber 12 is an enclosed space defined by solid electrolyte 2 , insulation layers 6 , and diffusion control layer 4.