Roadmap for Sustainable Mixed Ionic‐Electronic Conducting Membranes

Abstract

Mixed ionic-electronic conducting (MIEC) membranes have gained growing interest recently for various promising environmental and energy applications, such as H 2 and O 2 production, CO 2 reduction, O 2 and H 2 separation, CO 2 separation, membrane reactors for production of chemicals, cathode development for solid oxide fuel cells, solar-driven evaporation and energy-saving regeneration as well as electrolyzer cells for powerto-X technologies. The purpose of this roadmap, written by international specialists in their fields, is to present a snapshot of the state-of-the-art, and provide opinions on the future challenges and opportunities in this complex multidisciplinary research field. As the fundamentals of using MIEC membranes for various applications become increasingly challenging tasks, particularly in view of the growing interdisciplinary nature of this field, a better understanding of the underlying physical and chemical processes is also crucial to enable the career advancement of the next generation of researchers. As an integrated and combined article, it is hoped that this roadmap, covering all these aspects, will be informative to support further progress in academics as well as in the industry-oriented research toward commercialization of MIEC membranes for different applications.

Materials AIILnInO4 with Ruddlesden-Popper Structure for Electrochemical Applications: Relationship between Ion (Oxygen-Ion, Proton) Conductivity, Water Uptake, and Structural Changes

“…In the past years, the need of developing new materials suitable for using in various electrochemical devices keeps growing. From electrocatalysts [ 120 ] and MIEC membranes [ 121 ] to SOFCs [ 122 ], PCFCs, and PCECs [ 123 ], every branch of energy application sciences requires novel and highly effective materials for creation of advanced devices and technologies. The active growth of investigation of cathode materials with layered perovskite structure [ 46 , 47 , 48 , 49 , 50 ] makes the task of creating electrochemical sources with the same type of structure of electrolyte more relevant.…”

Nickel-Containing Perovskites, PrNi0.4Fe0.6O3–δ and PrNi0.4Co0.6O3–δ, as Potential Electrodes for Protonic Ceramic Electrochemical Cells

“…Projects implemented within such programs involve the manipulation of hydrogen and hydrogen-related compounds, including their safe production, storage, transportation, and utilization [ 7 , 8 ]. From this viewpoint, high-temperature electrochemical devices such as solid oxide fuel cells (SOFCs) and electrolysis cells (SOECs), belonging to a broad canvas of hydrogen-related energy approaches, represent one of the most efficient means of energy-conversion for various purposes [ 9 , 10 , 11 ].…”

Structural Features and Defect Equilibrium in Cubic PrBa1−xSrxFe2O6−δ

“…The perovskite-type ferrites R x A 1−x FeO 3−δ , where R is a rare-earth element and A is an alkaline earth one, are known to possess mixed oxygen-ion and electron conductivity (MIEC), which makes them promising functional materials for electrochemical devices for energy conversion and storage, such as solid oxide fuel cells (SOFCs), membrane reactors for oxygen separation from air and synthesis gas production [1][2][3][4][5][6].…”

“…Ion and electron conductivity of p-and n-type are known to be strongly affected by the oxygen content in the oxide (3−δ), temperature, type and fraction of the R cation [7][8][9][10]. Although in the most MIEC ferrites R x A 1−x FeO 3−δ lanthanum is used as R, materials based on perovskite-type ferrites with other R cations attracted much attention in recent years [6]. For example, the PrBaFe 2-x Co x O 5+δ oxides were successfully tested as cathode materials for intermediate-temperature SOFCs [11].…”