Efficiency and oxygen permeability of Gadolinium doped Ceria for oxygen separation mechanism

Abstract

Our study investigates Gadolinium-doped ceria (Ce_0.90Gd_0.10O_1.95), a material extensively studied as a catalyst support and oxide-based ionic conductor in electrochemical devices. Fine powders were prepared for large-scale ceramics, achieving a green density of 50% and sintering density of 92% at 1200°C, significantly lower than prior temperatures. Impedance spectra analysis showed increased resistance at grain boundaries due to fine grain size, no longer observed above 600°C. Recent advances in ceramic membranes for oxygen separation highlight its distinct pathway from traditional methods, offering cost-effective synthesis of pure oxygen. Conductivity was temperature-dependent with distinct patterns. Activation energies for grain-boundary dissociation and complex dissociation were 1.2 eV and 0.1 eV, respectively, unaffected by grain boundary size. Further it highlights recent advancements in ceramic membranes for oxygen separation at elevated temperatures, addressing challenges in selectivity and efficiency. The presence of distortions or oxygen vacancies enhances its industrial value, offering exceptional oxygen storage properties and enabling efficient production through thermal swing processes with medium to low-temperature industrial waste heat. This research emphasizes Ce_0.90Gd_0.10O_1.95 industrial value due to distortions and oxygen vacancies, facilitating efficient oxygen production from air via thermal swing processes with medium to low-temperature industrial waste heat