Abstract Ceramic ion-conducting membrane technology is one of the promising options for hydrogen separation to replace the conventional expensive cryogenic distillation methods. In order to achieve high H2 permeation flux, designing multi-phase membranes possessing high mixed protonic and electronic conductivities in asymmetric structure with a thin dense separating layer is an important strategy for future novel membrane development. Multi-phase dual-layer BaCe0.8Y0.2O3-δ (BCY)-Ce0.8Y0.2O2-δ (YDC)/BCY-Ni hollow fiber membrane with excellent hydrogen permeability was developed by a single-step co-extrusion technique in this work. The thickness of the dense layer of the membrane can be controlled by the powder content of BCY-YDC in the spinning suspension. When the content of BCY-YDC was lowered from 65 to 45 wt%, the thickness of the dense layer was decreased from 33.5 to 14.5 μm. The thin dual-phase BCY-YDC dense layer determines the H2 permeation and the porous BCY-Ni support layer provides the mechanical strength and catalytic effect for surface exchange reactions. Compared to the BCY-YDC single-layer membrane, the H2 flux of such dual-layer asymmetric membrane with dense layer of 17.0 μm was improved significantly by a factor of 2 reaching 0.566 mL cm−2 min−1 at 900 °C under the hydrogen partial pressure difference of 50 kPa. A long term permeation test for 240 h confirmed the high operational stability of the prepared dual layered hollow fiber membrane. The good membrane performance is directly sourced from the excellent integration of the dual layers prepared in one step and thin thickness of the densified separating layer with catalytic porous support.

中文翻译：

---

用于H2分离的双层BaCe0.8Y0.2O3-δ-Ce0.8Y0.2O2-δ/BaCe0.8Y0.2O3-δ-Ni中空纤维膜

摘要 陶瓷离子传导膜技术是替代传统昂贵的低温蒸馏方法的氢气分离的有前景的选择之一。为了实现高 H2 渗透通量，设计具有高混合质子和电子电导率且具有薄致密分离层的不对称结构的多相膜是未来新型膜开发的重要策略。通过单步共挤技术开发了具有优异透氢性的多相双层 BaCe0.8Y0.2O3-δ (BCY)-Ce0.8Y0.2O2-δ (YDC)/BCY-Ni 中空纤维膜这项工作。膜致密层的厚度可以通过纺丝悬浮液中BCY-YDC的粉末含量来控制。当BCY-YDC的含量从65wt%降低到45wt%时，致密层的厚度从 33.5 μm 减小到 14.5 μm。薄的双相 BCY-YDC 致密层决定了 H2 的渗透，多孔 BCY-Ni 支撑层为表面交换反应提供了机械强度和催化作用。与 BCY-YDC 单层膜相比，这种具有 17.0 μm 致密层的双层非对称膜的 H2 通量显着提高了 2 倍，在 900 °C 下达到 0.566 mL cm-2 min-1。氢气分压差为 50 kPa。240 小时的长期渗透试验证实了所制备的双层中空纤维膜的高运行稳定性。