Dual-Phase Mixed Protonic-Electronic Conducting Hydrogen Separation Membranes: A Review

Abstract

Owing to the excellent properties of high selectivity, high thermal stability, and low cost, in the past twenty years, mixed protonic-electronic conducting hydrogen separation membranes have received extensive attention. In particular, dual-phase mixed protonic-electronic conducting membranes with high ambipolar conductivity are more attractive because of the high hydrogen permeability. This paper aimed to present a review of research activities on the dual-phase membranes, in which the components, the characteristics, and the performances of different dual-phase membranes are introduced. The key issues that affect the membrane performance such as the elimination of the inter-phase reaction, the combination mode of the phases, the phase ratio, and the membrane configuration were discussed. The current problems and future trends were simply recommended.

Keywords: dual-phase; hydrogen separation; membrane; mixed protonic-electronic conducting.

Figure 1

Schematic diagram of the bulk diffusion of protons through the membrane [17].

Figure 2

Schematic diagram of the transport of protons and electrons in dual-phase membranes.

Figure 3

Three Pd-based cermet dual-phase membranes with different hydrogen permeation fluxes [34].

Figure 4

The contribution of two diffusion mechanisms to the total hydrogen permeation fluxes in Ni-SCYb cermet dual-phase membranes [52].

Figure 5

H₂ fluxes through Ni-BZCYb membrane feeding with dry and wet 4% H₂ [41].

Figure 6

SEM images of Ni-BZCYYb sintered at 900 °C for 200 h in 20% CO₂ containing atmosphere, (a) the original membrane, and (b) the sintered membrane [44].

Figure 7

XRD patterns of BCY-CYO after the stability test in atmosphere containing 4% H₂ (B), H₂O (C), 100% CO₂ (D); original membrane (A) [66].

Figure 8

Hydrogen fluxes as a function of time for 60LWO-40LSC modified by La_0.75Ce_0.1Sr_0.15CrO_3-δ (LCeSC)-Ni feeding with different gases [77].

Figure 9

XRD of sintered cercer Y, cercer YYb, cercer YEu, and cercer YEr membranes. ■, perovskite phase; #, fluorite phase [65].

Figure 10

BaCe_0.5Fe_0.5O_3-δ-based dual-phase membrane prepared by automatic phase separation technique [71].

Figure 11

The schematic diagram preparing independent distributed dual-phase membranes [74].

Figure 12

The schematic diagram of the phase distribution and the transport routs of protons and electrons, (a) dual-phase membrane prepared by simply powder blending, (b) laminated dual-phase membrane with short circuit pathways [74].

Figure 13

The preparation procedure of the asymmetric BCZY-GDC dual-phase membrane [69].