Journal
MEMBRANES
Volume 13, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/membranes13080698
Keywords
solid oxide fuel cells; oxygen separation membranes; hydrogen separation membranes; oxygen mobility; hydrogen mobility; isotope exchange of oxygen
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Oxygen and hydrogen mobility are important characteristics for the operation of electrochemical devices, and this work focuses on studying the diffusion of mixed ionic-electronic conducting materials and its role in device performance. The main laws of bulk diffusion and surface exchange are highlighted, and isotope exchange techniques are used to study these processes in detail. Ionic transport properties of various conventional and state-of-the-art materials are reviewed.
Oxygen and hydrogen mobility are among the important characteristics for the operation of solid oxide fuel cells, permselective membranes and many other electrochemical devices. This, along with other characteristics, enables a high-power density in solid oxide fuel cells due to reducing the electrolyte resistance and enabling the electrode processes to not be limited by the electrode-electrolyte-gas phase triple-phase boundary, as well as providing high oxygen or hydrogen permeation fluxes for membranes due to a high ambipolar conductivity. This work focuses on the oxygen and hydrogen diffusion of mixed ionic (oxide ionic or/and protonic)-electronic conducting materials for these devices, and its role in their performance. The main laws of bulk diffusion and surface exchange are highlighted. Isotope exchange techniques allow us to study these processes in detail. Ionic transport properties of conventional and state-of-the-art materials including perovskites, Ruddlesden-Popper phases, fluorites, pyrochlores, composites, etc., are reviewed.
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