Hydrogen Separation Properties and Characterization of Bazr0.9-Xprxin0.1o3-Δ Proton Conductors

Abstract

Doped BaZrO3 is increasingly recognized as a highly promising material for hydrogen separation membranes, owing to its exceptional chemical stability. In the present study, BaZr0.9-xPrxIn0.1O3-δ (x=0.1, 0.2, 0.3) composites were successfully synthesized the citrate sol-gel method with the aim of enhancing the hydrogen permeation properties of BaZrO3. The experimental results indicate that the hydrogen permeation performance of BaZr0.9-xPrxIn0.1O3-δ can be significantly optimized by increasing the hydrogen partial pressure, elevating the operating temperature, employing wet sweep gas, and reducing membrane thickness. When the Pr3+ doping concentration is 20%, the material exhibits the highest conductivity and hydrogen flux. An asymmetric membrane with a thickness of 29 μm demonstrates an enhanced hydrogen permeation flux of 13.83×10-9 mol·cm-2·s-1 at 900°C. Stability tests conducted over a period of 50 hours in a 20% CO2 humidified atmosphere revealed no significant degradation in hydrogen permeation flux, underscoring its outstanding long-term stability. These results suggest that BaZr0.9-xPrxIn0.1O3-δ is a highly promising candidate material for hydrogen separation applications.

Keywords: BaZr0.9-xPrxIn0.1O3-δ, stability, Proton conductivity, Hydrogen separation membrane