Hydrogen separation through tailored dual phase membranes with nominal composition BaCe0.8Eu0.2O3-δ:Ce0.8Y0.2O2-δ at intermediate temperatures

Abstract

Hydrogen permeation membranes are a key element in improving the energy conversion efficiency and decreasing the greenhouse gas emissions from energy generation. The scientific community faces the challenge of identifying and optimizing stable and effective ceramic materials for H2 separation membranes at elevated temperature (400–800 °C) for industrial separations and intensified catalytic reactors. As such, composite materials with nominal composition BaCe0.8Eu0.2O3-δ:Ce0.8Y0.2O2-δ revealed unprecedented H2 permeation levels of 0.4 to 0.61 mL·min−1·cm−2 at 700 °C measured on 500 μm-thick-specimen. A detailed structural and phase study revealed single phase perovskite and fluorite starting materials synthesized via the conventional ceramic route. Strong tendency of Eu to migrate from the perovskite to the fluorite phase was observed at sintering temperature, leading to significant Eu depletion of the proton conducing BaCe0.8Eu0.2O3-δ phase. Composite microstructure was examined prior and after a variety of functional tests, including electrical conductivity, H2-permeation and stability in CO2 containing atmospheres at elevated temperatures, revealing stable material without morphological and structural changes, with segregation-free interfaces and no further diffusive effects between the constituting phases. In this context, dual phase material based on BaCe0.8Eu0.2O3-δ:Ce0.8Y0.2O2-δ represents a very promising candidate for H2 separating membrane in energy- and environmentally-related applications.

Risks of cognitive detriments after low dose heavy ion and proton exposures

“…In mice HZE irradiation was about 3 times more effective compared to gamma-rays for induction of an acute neuroinflammatory response, and increased expression of the CCR2 receptor was observed in the subgranular zone 9 months after 1–3 Gy 12 C or 56 Fe irradiation (Rola et al, 2005). In vitro studies have shown that HZE particles produce significantly higher levels of ROS compared to low LET radiation (Limoli et al 2007), and a persistent inflammatory response at lower doses for post-irradiation times of 1-month or more (Parihar et al 2016, Cherry et al 2013). However it is not clear if a significant induction of neuroinflammation occurs in the hippocampus at lower HZE particle doses (0.1 to 0.5 Gy) within the first 30 d post-irradiation (Rola et al, 2008) with less known for other brain regions.…”

Processing Ceramic Proton Conductor Membranes for Use in Steam Electrolysis

“…This advanced casting technique involves the inversion of the traditional tape casting approach’s necessary manufacturing steps and produces homogeneous, large-area, flat ceramic films. This method has been used for the fabrication of solid oxide-oxygen ions conducting fuel and electrolysis cell (O-SOFC/O-SOEC) [ 21 , 23 ] as well as hydrogen [ 31 , 32 ] and oxygen separation membranes [ 33 , 34 , 35 ]. Another great advantage of this technique is its potential to minimize manufacturing cost since multi-layer components are laminated and co-sintered in a single step [ 23 , 35 ].…”

Quantification of grain boundary defect chemistry in a mixed proton‐electron conducting oxide composite

“…Single phase MPECs can have good stability but prohibitively low H 2 permeation fluxes. However, when a second electrically conducting phase is added, H 2 permeation values can be much higher [3][4][5][6] . BaCe 0.8 Y 0.2 O 3-δ -Ce 0.8 Y 0.2 O 2-δ (BCY-YDC) in which the BCY phase is the primary proton conductor and the YDC phase is the electronically active phase, 7 has shown promising H 2 permeation results 4 and is the focus of the current work.…”