Materials design of perovskite solid solutions for thermochemical applications

Vieten, Josua; Bulfin, Brendan; Huck, P.; Horton, Matthew K.; Gubán, Dorottya; Zhu, Liya; Lu, Youjun; Persson, Kristin A.; Roeb, Martin; Sattler, Christian

doi:10.1039/c9ee00085b

Cited by 137 publications

(167 citation statements)

References 83 publications

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“…Perovskite based oxygen sorbents have the advantage of reversibly absorb and desorb oxygen at significantly lower temperatures (e.g. ≤ 600 • C), owing to their structural flexibility to accommodate significant amount of oxygen vacancies [30][31][32][33][34][35][36]. For example, La 0.1 Sr 0.9 Co 0.9 Fe 0.1 O 3-δ has a wide range of oxygen vacancy depending on temperature and oxygen partial pressure [37,38].…”

Section: Introductionmentioning

confidence: 99%

Sr_1-xCa_xFe_1-yCo_yO_3-δ as facile and tunable oxygen sorbents for chemical looping air separation

et al. 2020

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Chemical looping air separation (CLAS) is a promising technology for oxygen generation with high efficiency. The key challenge for CLAS is to design robust oxygen sorbents with suitable redox properties and fast redox kinetics. In this work, perovskite-structured Sr 1-x Ca x Fe 1-y Co y O 3 oxygen sorbents were investigated and demonstrated for oxygen production with tunable redox properties, high redox rate, and excellent thermal/steam stability. Cobalt doping at B site was found to be highly effective, 33% improvement in oxygen productivity was observed at 500 • C. Moreover, it stabilizes the perovskite structure and prevents phase segregation under pressure swing conditions in the presence of steam. Scalable synthesis of Sr 0.8 Ca 0.2 Fe 0.4 Co 0.6 O 3 oxygen sorbents was carried out through solid state reaction, co-precipitation, and sol-gel methods. Both co-precipitation and sol-gel methods are capable of producing Sr 0.8 Ca 0.2 Fe 0.4 Co 0.6 O 3 sorbents with satisfactory phase purity, high oxygen capacity, and fast redox kinetics. Large scale evaluation of Sr 0.8 Ca 0.2 Fe 0.4 Co 0.6 O 3 , using an automated CLAS testbed with over 300 g sorbent loading, further demonstrated the effectiveness of the oxygen sorbent to produce 95% pure O 2 with a satisfactory productivity of 0.04 g O2 g sorbent −1 h −1 at 600 • C.

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Section: Introductionmentioning

confidence: 99%

Sr_1-xCa_xFe_1-yCo_yO_3-δ as facile and tunable oxygen sorbents for chemical looping air separation

et al. 2020

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“…As their arrangement is very flexible, the adjustment of their properties is feasible [24]. A method for the design of A A M M O perovskite solid solutions with two different species on the M and A sites in order to tune their redox behaviour has been developed (see Figure 4) [25]. Iterations of n values and Goldschmidt tolerance factor t [26] are made to define reliable compositions.…”

Section: Approach and Assumptionsmentioning

confidence: 99%

“…solid solutions with two different species on the M and A sites in order to tune their redox behaviour has been developed (see Figure 4) [25]. Iterations of n values and Goldschmidt tolerance factor t [26] are made to define reliable compositions.…”

Section: Approach and Assumptionsmentioning

confidence: 99%

Future Fuels—Analyses of the Future Prospects of Renewable Synthetic Fuels

et al. 2019

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The Future Fuels project combines research in several institutes of the German Aerospace Center (DLR) on the production and use of synthetic fuels for space, energy, transportation, and aviation. This article gives an overview of the research questions considered and results achieved so far and also provides insight into the multidimensional and interdisciplinary project approach. Various methods and models were used which are embedded in the research context and based on established approaches. The prospects for large-scale fuel production using renewable electricity and solar radiation played a key role in the project. Empirical and model-based investigations of the technological and cost-related aspects were supplemented by modelling of the integration into a future electricity system. The composition, properties, and the related performance and emissions of synthetic fuels play an important role both for potential oxygenated drop-in fuels in road transport and for the design and certification of alternative aviation fuels. In addition, possible green synthetic fuels as an alternative to highly toxic hydrazine were investigated with different tools and experiments using combustion chambers. The results provide new answers to many research questions. The experiences with the interdisciplinary approach of Future Fuels are relevant for the further development of research topics and co-operations in this field.Synthetic fuels based on renewable energies (RE) are widely seen as a key element to achieving climate-neutral transport (e.g., [1,2]). As liquid hydrocarbons have a high energy and power density, they are primarily discussed as fuels for (heavy) road vehicles, ships, and aircraft. Due to their low storage and transport losses, they are also conceivable as a complementary long-term electricity storage option [3]. The challenges of producing and implementing these fuels are manifold. Chemical processes and renewable electrical or thermal energy can be used to produce liquid hydrocarbons from various carbon sources and hydrogen (and sometimes oxygen). Synthetic fuels have several advantages: they can be easily integrated into our existing energy and mobility infrastructures, can be used in all areas of the transport sector, and they can be optimized with regard to their chemical properties. The main disadvantages are the high energy losses and production costs.In this research context, eleven research groups at the German Aerospace Center (DLR) are working together on the Future Fuels project on synthetic fuels. The aim of the interdisciplinary approach is to realize synergies and joint research activities, as well as new research impulses through different perspectives. The scientists and engineers are investigating how synthetic fuels can be produced using solar energy and electrolysis processes (Solar Fuels), and are developing concepts for the re-conversion of these fuels into electricity. They are working on emission-optimized fuels for transport and aviation (Designer Fuels), as well as advanced space ap...

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“…Currently, the state-of-the-art material is ceria due to its suitable thermodynamic properties and fast kinetics for syngas production. [10,11] Based on the amount of fuel produced per cycle, the La 0.6 Sr 0.4 MnO 3 perovskite is still an attractive option for thermochemical syngas production, [10,11,[13][14][15][16][17][18][19][20] provided the kinetics and/or thermodynamics are improved. [6] Exploring alternative materials that provide a higher oxygen release and better splitting kinetics (when compared to that of ceria) is of scientific and technological interest.…”

Section: Introductionmentioning

confidence: 99%

“…[10,11] High CO yields were obtained for La 1−x Sr x MnO 3 perovskites (x = 0.4), but the decrease in enthalpy of reduction with increasing Sr content [12] also leads to a lower thermodynamic driving force for fuel production resulting in slower splitting kinetics. [10,11] Based on the amount of fuel produced per cycle, the La 0.6 Sr 0.4 MnO 3 perovskite is still an attractive option for thermochemical syngas production, [10,11,[13][14][15][16][17][18][19][20] provided the kinetics and/or thermodynamics are improved. This fact motivated the present work, in which we have explored the partial substitution of Mn by Cr with the purpose of studying its effect on the CO 2 -splitting capabilities.…”

Section: Introductionmentioning

confidence: 99%

Modifying La_0.6Sr_0.4MnO₃ Perovskites with Cr Incorporation for Fast Isothermal CO₂‐Splitting Kinetics in Solar‐Driven Thermochemical Cycles

Carrillo

Bork

Moser

et al. 2019

Advanced Energy Materials

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Perovskites are promising oxygen carriers for solar‐driven thermochemical fuel production due to higher oxygen exchange capacity. Despite their higher fuel yield capacity, La0.6Sr0.4MnO3 perovskite materials present slow CO2‐splitting kinetics compared with state‐of‐the‐art CeO2. In order to improve the CO production rates, the incorporation of Cr in La0.6Sr0.4MnO3 is explored based on thermodynamic calculations that suggest an enhanced driving force toward CO2 splitting at high temperatures for La0.6Sr0.4CrxMn1−xO3 perovskites. Here, reported is a threefold faster CO fuel production for La0.6Sr0.4Cr0.85Mn0.15O3 compared to conventional La0.6Sr0.4MnO3, and twofold faster than CeO2 under isothermal redox cycling at 1400 °C, and high stability upon long‐term cycling without any evidence of microstructural degradation. The findings suggest that with the proper design in terms of transition metal ion doping, it is possible to adjust perovskite compositions and reactor conditions for improved solar‐to‐fuel thermochemical production under nonconventional solar‐driven thermochemical cycling schemes such as the here presented near isothermal operation.

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Materials design of perovskite solid solutions for thermochemical applications

Abstract: Perovskite solid solutions are screened both experimentally and through DFT to determine their redox properties for thermochemical applications.

Cited by 137 publications

References 83 publications

Sr_1-xCa_xFe_1-yCo_yO_3-δ as facile and tunable oxygen sorbents for chemical looping air separation

Sr_1-xCa_xFe_1-yCo_yO_3-δ as facile and tunable oxygen sorbents for chemical looping air separation

Future Fuels—Analyses of the Future Prospects of Renewable Synthetic Fuels

Modifying La_0.6Sr_0.4MnO₃ Perovskites with Cr Incorporation for Fast Isothermal CO₂‐Splitting Kinetics in Solar‐Driven Thermochemical Cycles

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Materials design of perovskite solid solutions for thermochemical applications

Abstract: Perovskite solid solutions are screened both experimentally and through DFT to determine their redox properties for thermochemical applications.

Cited by 137 publications

References 83 publications

Sr1-xCaxFe1-yCoyO3-δ as facile and tunable oxygen sorbents for chemical looping air separation

Sr1-xCaxFe1-yCoyO3-δ as facile and tunable oxygen sorbents for chemical looping air separation

Future Fuels—Analyses of the Future Prospects of Renewable Synthetic Fuels

Modifying La0.6Sr0.4MnO3 Perovskites with Cr Incorporation for Fast Isothermal CO2‐Splitting Kinetics in Solar‐Driven Thermochemical Cycles

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Sr_1-xCa_xFe_1-yCo_yO_3-δ as facile and tunable oxygen sorbents for chemical looping air separation

Sr_1-xCa_xFe_1-yCo_yO_3-δ as facile and tunable oxygen sorbents for chemical looping air separation

Modifying La_0.6Sr_0.4MnO₃ Perovskites with Cr Incorporation for Fast Isothermal CO₂‐Splitting Kinetics in Solar‐Driven Thermochemical Cycles