Effects of Bi Substitution on the Cobalt-Free 60wt.%Ce0.9Pr0.1O2−δ-40wt.%Pr0.6Sr0.4Fe1−xBixO3−δ Oxygen Transport Membranes

Zhang, Chao; Huang, Yanhao; Zeng, Lingyong; He, Yiyi; Yu, Peifeng; Luo, Huixia

doi:10.3390/pr9101767

Cited by 4 publications

(2 citation statements)

References 55 publications

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“…Oxides and solid solutions with the pyrochlore structure A 2 B 2 O 7 (or A 2 B 2 O 6 O’, where A and B are rare earth or transition elements) attracted a lot of attention as materials for many applications such as oxygen [ 1 , 2 , 3 , 4 ] and hydrogen [ 5 , 6 ] separation membranes, solid oxide fuel cell/electrolyzer electrolytes [ 1 , 7 , 8 , 9 ] and electrodes [ 8 , 10 , 11 ], catalysts for various transformation processes [ 12 , 13 ], pigments [ 14 , 15 ], etc. [ 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Oxygen Mobility of Bismuth Cerates and Titanates with Pyrochlore Structure

et al. 2023

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Synthesis and study of materials based on bismuth cerates and titanates were carried out. Complex oxides Bi1.6Y0.4Ti2O7 were synthesized by the citrate route; Bi2Ce2O7 and Bi1.6Y0.4Ce2O7—by the Pechini method. The structural characteristics of materials after conventional sintering at 500–1300 °C were studied. It is demonstrated that the formation of a pure pyrochlore phase, Bi1.6Y0.4Ti2O7, occurs after high-temperature calcination. Complex oxides Bi2Ce2O7 and Bi1.6Y0.4Ce2O7 have a pyrochlore structure formed at low temperatures. Yttrium doping of bismuth cerate lowers the formation temperature of the pyrochlore phase. As a result of calcination at high temperatures, the pyrochlore phase transforms into the CeO2-like fluorite phase enriched by bismuth oxide. The influence of radiation-thermal sintering (RTS) conditions using e-beams was studied as well. In this case, dense ceramics are formed even at sufficiently low temperatures and short processing times. The transport characteristics of the obtained materials were studied. It has been shown that bismuth cerates have high oxygen conductivity. Conclusions are drawn about the oxygen diffusion mechanism for these systems. The materials studied are promising for use as oxygen-conducting layers in composite membranes.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Oxygen Mobility of Bismuth Cerates and Titanates with Pyrochlore Structure

et al. 2023

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“…In general, they could be classified by their crystal structure. The three general crystal structures for the electronic or mixed ionic electronic conductor (MIEC) phases are simple perovskite, spinel, and Ruddlesden–Popper. ,− Among these, the most used materials present a perovskite crystal structure. In this context, these oxide structures can be MIEC or pure electronic semiconductors, but most of them comprise alkaline earth in the material and hence involve stability challenges under CO 2 atmospheres at mid-long times of operation. ,, Spinels are the second material class most used for the electronic phase in dual-phase membranes.…”

Section: Introductionmentioning

confidence: 99%

Co₂MnO₄/Ce_0.8Tb_0.2O_2−δ Dual-Phase Membrane Material with High CO₂ Stability and Enhanced Oxygen Transport for Oxycombustion Processes

Laqdiem,

Garcia-Fayos,

Carrillo

et al. 2023

ACS Appl. Energy Mater.

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Oxygen transport membranes (OTMs) are a promising oxygen production technology with high energy efficiency due to the potential for thermal integration. However, conventional perovskite materials of OTMs are unstable in CO 2 atmospheres, which limits their applicability in oxycombustion processes. On the other hand, some dual-phase membranes are stable in CO 2 and SO 2 without permanent degradation. However, oxygen permeation is still insufficient; therefore, intensive research focuses on boosting oxygen permeation. Here, we present a novel dual-phase membrane composed of an ion-conducting fluorite phase (Ce 0.8 Tb 0.2 O 2−δ , CTO) and an electronic-conducting spinel phase (Co 2 MnO 4 , CMO). CMO spinel exhibits high electronic conductivity (60 S•cm −1 at 800 °C) compared to other spinels used in dual-phase membranes, i.e., 230 times higher than that of NiFe 2 O 4 (NFO). This higher conductivity ameliorates gas−solid surface exchange and bulk diffusion mechanisms. By activating the bulk membrane with a CMO/ CTO porous catalytic layer, it was possible to achieve an oxygen flux of 0.25 mL•min −1 •cm −2 for the 40CMO/60CTO (% vol ), 680 μm-thick membrane at 850 °C even under CO 2 -rich environments. This dual-phase membrane shows excellent potential as an oxygen transport membrane or oxygen electrode under high CO 2 and oxycombustion operation.

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Recent Progress and Challenges in Mixed Ionic–Electronic Conducting Membranes for Oxygen Separation

Kwon

Nam

Lee

et al. 2022

Adv Energy and Sustain Res

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Carbon neutrality refers to the state of making net‐zero emissions of carbon dioxide (CO2), which is a key concept in tackling global warming. It can be achieved by offsetting carbon emissions as well as balancing reduced and emitted emissions. Globally, CO2 is emitted mainly from fossil fuel power plants. The use of carbon capture and storage technology, including pre‐, post‐, and oxy‐fuel combustion capture, in power plants can provide a carbon‐neutral strategy that allows for the sustainable use of fossil fuels while potentially reducing CO2 emissions. Oxy‐fuel combustion capture facilitates CO2 capture by simplifying combustion products through the reaction of recirculated flue gas with a high‐purity oxygen. Oxygen transport membranes, which produce pure oxygen by oxygen transport via oxides at high temperatures, have attracted increased interest because they can improve overall efficiency when integrated with oxy‐fuel combustion capture. Dual‐phase membranes with fluorite structure have greater potential for commercialization than perovskite‐based single‐phase membranes, which have poor chemical and mechanical properties. However, despite these advantages, their low oxygen permeability remains a critical issue. This review focuses on progress in the development of dual‐phase membranes and summarizes various approaches that can facilitate bulk diffusion and surface exchange, which affect the oxygen permeability.

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Effects of Bi Substitution on the Cobalt-Free 60wt.%Ce0.9Pr0.1O2−δ-40wt.%Pr0.6Sr0.4Fe1−xBixO3−δ Oxygen Transport Membranes

Cited by 4 publications

References 55 publications

Synthesis and Oxygen Mobility of Bismuth Cerates and Titanates with Pyrochlore Structure

Synthesis and Oxygen Mobility of Bismuth Cerates and Titanates with Pyrochlore Structure

Co₂MnO₄/Ce_0.8Tb_0.2O_2−δ Dual-Phase Membrane Material with High CO₂ Stability and Enhanced Oxygen Transport for Oxycombustion Processes

Recent Progress and Challenges in Mixed Ionic–Electronic Conducting Membranes for Oxygen Separation

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Effects of Bi Substitution on the Cobalt-Free 60wt.%Ce0.9Pr0.1O2−δ-40wt.%Pr0.6Sr0.4Fe1−xBixO3−δ Oxygen Transport Membranes

Cited by 4 publications

References 55 publications

Synthesis and Oxygen Mobility of Bismuth Cerates and Titanates with Pyrochlore Structure

Synthesis and Oxygen Mobility of Bismuth Cerates and Titanates with Pyrochlore Structure

Co2MnO4/Ce0.8Tb0.2O2−δ Dual-Phase Membrane Material with High CO2 Stability and Enhanced Oxygen Transport for Oxycombustion Processes

Recent Progress and Challenges in Mixed Ionic–Electronic Conducting Membranes for Oxygen Separation

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Co₂MnO₄/Ce_0.8Tb_0.2O_2−δ Dual-Phase Membrane Material with High CO₂ Stability and Enhanced Oxygen Transport for Oxycombustion Processes