Mechanical reliability of Ce_0.8Gd_0.2O_2−δ‐FeCo₂O₄ dual phase membranes synthesized by one‐step solid‐state reaction

Abstract

Ce 0.8 Gd 0.2 O 2-δ-FeCo 2 O 4 composites are attractive candidate materials for high-purity oxygen generation providing robust chemical stability. Aiming for future industrial applications, a feasible solid-state reaction process with one thermal processing step was used to synthesize 50 wt% Ce 0.8 Gd 0.2 O 2-δ :50 wt% FeCo 2 O 4 and 85 wt% Ce 0.8 Gd 0.2 O 2-δ :15 wt% FeCo 2 O 4 composites. Mechanical reliabilities of the sintered membranes were assessed based on the characterized mechanical properties and subcritical crack growth behavior. In general, the fracture strengths of as-sintered membranes were reduced by tensile residual stresses and microcracks. In particular, the enhanced subcritical crack growth behavior, which leads to limited stress tolerance and high Accepted Article This article is protected by copyright. All rights reserved failure probability after a 10-years operation, was evaluated in more detail. Further materials and processing improvements are needed to eliminate the tensile stress and microcracks to warrant a long-term reliable operation of the composites.

Advances in Electrochemical and Catalytic Performance of Nanostructured FeCo2O4 and Its Composites

“…Ceramic oxide transport membranes due to their 100% selectivity to oxygen, find wide range of applications in areas of pure oxygen production, carbon capture/ storage, petrochemical processes and oxy-combustion. [102][103][104][105][106] [102] for oxygen transport. [106] According to recent reports, Ce 0.8 Gd 0.2 O 1.9 as ionic conducting phase, promised mechanical and chemical stability in corrosive atmospheres (e. g., SO 2 , CO 2 ) at elevated temperature (~850°C).…”

“…In the meanwhile, Zeng et al [108] managed to improve the oxygen permeation by obtaining homogeneous powder mixtures with fine particle sizes via modified wet ball milling procedures. Furthermore, Zeng et al [102] carried out a one-step solid state synthesis of two different compositions of Ce 0. [101] Reproduced with permissions from Ref.…”

“…Efficient and accurate determination of aberrant levels of dopamine, acetaminophen, and xanthine into physiological fluids is essential for the prevention of many diseases. However, these [102,106] (b) Ambipolar conductivity as a function of volume fraction of ionic/electronic conducting phase when R = 1 for CGO-FCO dual phase membranes. [105] [110] (d) Schematic representation for fibre optic sensor setup with SEM image of FeCo 2 O 4 nanoparticles.…”

“…Figure 13. (a) Likely fracture origins of 85CGO : 15FCO fractured at 20 MPa/s with the dashed lines representing the probable boundaries of fracture origins and dashed arrows indicate the fracture lines; inset shows the microstructure of CGO:FCO at 1350°C,[102,106] (b) Ambipolar conductivity as a function of volume fraction of ionic/electronic conducting phase when R = 1 for CGO-FCO dual phase membranes [105]. (c) CVs of BC/Co 3 O 4 /FeCo 2 O 4 /GCE in 5 mM [Fe(CN)6] 3-/4with a series of scan rates (20-300 mV s À 1 ); inset is SEM image of BC (Biomass Carbon)/Co 3 O 4 /FeCo 2 O 4 nanocomposites [110].…”

“…(e) Schematic representation of fibre optic sensing mechanism of the FeCo 2 O 4 /Graphene hybrid sensor [112]. Adapted/reproduced with permissions from Ref [102]…”