The proton conduction and hydrogen permeation characteristic of Sr(Ce _0.6 Zr _0.4 ) _0.85 Y _0.15 O _3-δ ceramic separation membrane

In this study, proton-conducting Sr(Ce _0.6 Zr _0.4 ) _0.85 Y _0.15 O _3-δ perovskite is synthesized using the citrate-ethylenediaminetetraacetic acid (EDTA) complexing method. The crystal structure, sintering behavior, coefficient of thermal expansion (CTE), electrical conductivity, electrochemical performance and hydrogen permeation of the Sr(Ce _0.6 Zr _0.4 ) _0.85 Y _0.15 O _3-δ is determined for various atmospheres and partial pressures of water. Sr(Ce _0.6 Zr _0.4 ) _0.85 Y _0.15 O _3-δ is extremely dense after sintering at 1450°C for 6h. The structure of the Sr(Ce _0.6 Zr _0.4 ) _0.85 Y _0.15 O _3-δ does not change after heat treatment in a hydrogen atmosphere at a partial pressure of water of 4.93×10 ^-2 atm. The CTE of the Sr(Ce _0.6 Zr _0.4 ) _0.85 Y _0.15 O _3-δ at temperature of 100-900°C is 11.4×10 ^-6 K ^-1 . The electrical conductivity of the sample is 0.012Scm ^-1 at 900°C. The hydrogen permeation flux increases from 0.1 to 0.184mmolmin ^-1 cm ^-2 as the temperature increases from 500°C to 800°C.