Preparation and characterization of Ce_(0.8)Sm_(0.2)O_(1.9)-La_(0.8)Sr_(0.2)Cr_(0.5)Fe_(0.5)O_(3-δ) dual-phase membranes for oxygen permeation

In this study,with La_(0.8)Sr_(0.2)Cr_(0.5)Fe_(0.5)O_(3-δ)(LSCrF)and Ce_(0.8)Sm_(0.2)O_(1.9)(SDC)taken as the electronic conducting phase and the oxide ion conductor,respectively,dual-phase composite ceramic membranes with or without 3%(in mole)Y_(2)O_(3) stable ZrO_(2)(3YSZ)support were prepared and tested as oxygen separation membranes.Then,the oxygen transmission performance was tested by the electrochemical method based on the limiting current.The results obtained with this method coincide with those acquired by means of gas chromatography.Furthermore,the dependences of oxygen permeation rate on oxygen partial pressure,temperature and ceramic membrane thickness were analyzed.When air was used as the sweeping gas on the porous 3YSZ supported SDC-LSCrF dual-phase membrane,the oxygen permeation rate can reach 0.73,0.82,0.90 and 0.97 mL cm^(-2) min^(-1) at 650,700,750 and 800℃,respectively.