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.

Design and Validation of an Experimental Setup for Evaluation of Gas Permeation in Ceramic Membranes

“…Water is introduced to the ceramic surface and, after dissociation, oxygen is removed, resulting in a flow of hydrogen-enriched carrier gas [ 2 ]. Low-coast proton and electron conducting dual-phase composite membranes, besides presenting high selectivity to hydrogen, show high stability [ 3 ].…”

Design of Mixed Ionic-Electronic Materials for Permselective Membranes and Solid Oxide Fuel Cells Based on Their Oxygen and Hydrogen Mobility

“…Similar to the oxygen separation membranes, a high hydrogen mobility and surface reactivity as well as a high electronic conductivity are required for hydrogen separation membrane materials. This allows it to reach high hydrogen permeation fluxes for obtaining pure hydrogen including its production in catalytic membrane reactors for fuel transformation reactions [ 42 , 55 , 58 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 ]. There are advantages in using triple (H + /O 2− /e − )-conducting materials for hydrogen separation membranes, since the presence of the oxide-ionic component of the conductivity can enable the following features: Some proton transport mechanisms being mediated by the oxygen transport as will be mentioned in Section 3.2 [ 90 , 91 , 92 ]; Oxide ion counterpermeation across the membrane allows us to increase the hydrogen yield due to the water splitting reaction [ 89 , 93 , 94 ]; Triple conductivity allows to enhance the performance in various catalytic reactions and to improve gas separation properties due to the coupled transport of all types of mobile species, forcing them to be transported against their chemical potential gradient [ 95 , 96 , 97 ].…”

“…In the case of a cermet membrane, the equation for its hydrogen permeation flux combines those for the ceramic (Equation (8)) and metallic (Equation (6)) components (Equation (9)): where x ceram is the volume fraction of the ceramic component, Pe metal is the permeability of the metallic component [ 86 ].…”

Tailoring Alkaline Metals Ion‐Doped La2Ce2O7−δ Proton Conductor for Hydrogen Permeation Membranes

“…[7][8][9] However, the main hydrogen production methods result in the formation of by-products; therefore, the separation and purification of hydrogen are indispensable steps. [10] Separation and purification technologies of hydrogen include pressure swing adsorption, low-temperature separation, and membrane separation. [11,12] Membrane separation offers several advantages in terms of cost and flexibility.…”

“…[11,12] Membrane separation offers several advantages in terms of cost and flexibility. [10,13] Mixed proton-electron membranes are considered promising candidates for H 2 separation because of their excellent mechanical properties, low cost of membrane materials, and 100% H 2 selectivity. [14] Proton conductivity plays a crucial role in proton-electron mixed-conduction hydrogen separation membranes.…”