The proton conduction and hydrogen permeation characteristic of Sr(Ce0.6Zr0.4)0.85Y0.15O3−δ ceramic separation membrane

In this study, proton-conducting Sr(Ce0.6Zr0.4)0.85Y0.15O3−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(Ce0.6Zr0.4)0.85Y0.15O3−δ is determined for various atmospheres and partial pressures of water. Sr(Ce0.6Zr0.4)0.85Y0.15O3−δ is extremely dense after sintering at 1450 °C for 6 h. The structure of the Sr(Ce0.6Zr0.4)0.85Y0.15O3−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(Ce0.6Zr0.4)0.85Y0.15O3−δ at temperature of 100–900 °C is 11.4 × 10−6 K−1. The electrical conductivity of the sample is 0.012 S cm−1 at 900 °C. The hydrogen permeation flux increases from 0.1 to 0.184 mmol min−1 cm−2 as the temperature increases from 500 °C to 800 °C.