A decade of ceria based solar thermochemical H2O/CO2 splitting cycle

Bhosale, Rahul R.; Takalkar, Gorakshnath; Sutar, Parag N.; Kumar, Anand; Khraisheh, Majeda

doi:10.1016/j.ijhydene.2018.04.080

Cited by 140 publications

(78 citation statements)

References 78 publications

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“…The Gibbs energy variation for the reduction and the oxidation steps are defined by Equations (5) and (6), respectively, whereas Equations (7) and (8) define the enthalpy and entropy variation of the overall cycle;…”

Section: ∆G •mentioning

confidence: 99%

“…The high reduction temperature induces sintering and reactor materials issues, and thus limits the practical use of ceria. Different dopants were investigated to increase fuel production while lowering the reduction temperature, like Li 2+ , Mg 2+ , Sc 3+ , Dy 3+ , La 3+ , Sm 3+ , Gd 3+ , Pr 3+ , Hf 4+ , and Zr 4+ [5][6][7][8][9][10][11][12][13][14], at the expense of lowering the oxidation rate. In spite of the numerous dopants investigated, the relatively low fuel productivity of ceria still limits its future implementation in large-scale processes [5].…”

Section: Introductionmentioning

confidence: 99%

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Non-Stoichiometric Redox Active Perovskite Materials for Solar Thermochemical Fuel Production: A Review

et al. 2018

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Due to the requirement to develop carbon-free energy, solar energy conversion into chemical energy carriers is a promising solution. Thermochemical fuel production cycles are particularly interesting because they can convert carbon dioxide or water into CO or H2 with concentrated solar energy as a high-temperature process heat source. This process further valorizes and upgrades carbon dioxide into valuable and storable fuels. Development of redox active catalysts is the key challenge for the success of thermochemical cycles for solar-driven H2O and CO2 splitting. Ultimately, the achievement of economically viable solar fuel production relies on increasing the attainable solar-to-fuel energy conversion efficiency. This necessitates the discovery of novel redox-active and thermally-stable materials able to split H2O and CO2 with both high-fuel productivities and chemical conversion rates. Perovskites have recently emerged as promising reactive materials for this application as they feature high non-stoichiometric oxygen exchange capacities and diffusion rates while maintaining their crystallographic structure during cycling over a wide range of operating conditions and reduction extents. This paper provides an overview of the best performing perovskite formulations considered in recent studies, with special focus on their non-stoichiometry extent, their ability to produce solar fuel with high yield and performance stability, and the different methods developed to study the reaction kinetics.

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Section: ∆G •mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non-Stoichiometric Redox Active Perovskite Materials for Solar Thermochemical Fuel Production: A Review

et al. 2018

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“…Amongst various possible STWS cycles, two-step cycles are most promising to achieve economical large-scale hydrogen production with high conversion efficiency. 184 Compared to the current standard STWS material ceria which has been extensively investigated for years, 222 perovskite materials and doped-hercynite show more advantages such as lower reduction temperature, higher fuel production rate and larger fuel production capacity. Future research should concentrate on the development of these materials and solar reactors based 53 on flowing particles (Figure 20).…”

Section: Although Significant Efforts Have Been Made To Develop New Rmentioning

confidence: 99%

Research advances towards large-scale solar hydrogen production from water

et al. 2019

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Solar hydrogen production from water is a sustainable alternative to traditional hydrogen production route using fossil fuels. However, there is still no existing large-scale solar hydrogen production system to compete with its counterpart. In this Review, recent developments of four potentially cost-effective pathways towards large-scale solar hydrogen production, viz. photocatalytic, photobiological, solar thermal and photoelectrochemical routes, are discussed, respectively. The limiting factors including efficiency, scalability and durability for scale-up are assessed along with the field performance of the selected systems. Some benchmark studies are highlighted, mostly addressing one or two of the limiting factors, as well as a few recent examples demonstrating upscaled solar hydrogen production systems and emerging trends towards large-scale hydrogen production. A techno-economic analysis provides a critical comparison of the levelized cost of hydrogen output via each of the four solar-to-hydrogen conversion pathways.

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“…In the first phase, the MO is reduced with the help of concentrated solar power, and in phase 2, the reduced MO is reoxidized again via a CO 2 splitting reaction. Zinc oxide [8,9], tin oxide [10,11], iron oxide [12,13], CeO 2 [14][15][16], doped ceria [17][18][19][20], ferrites [21][22][23][24], perovskites [25][26][27][28], and others [29][30][31][32] have been utilized for the solar thermochemical conversion of H 2 O and CO 2 . Among all these, the phase pure CeO 2 is considered as one of the promising options due to its faster reaction kinetics and better thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Co-precipitation synthesized nanostructured Ce0.9Ln0.05Ag0.05O2−δ materials for solar thermochemical conversion of CO2 into fuels

et al. 2020

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Synthesis, characterization, and application of Ce 0.9 Ln 0.05 Ag 0.05 O 2-d materials (where, Ln = La, Pr, Nd, Sm, Gd, Tb, Dy, Er) for the thermochemical conversion of CO 2 reported in this paper. The Ce 0.9 Ln 0.05 Ag 0.05 O 2-d materials were synthesized by using an ammonium hydroxide-driven co-precipitation method. The derived Ce 0.9 Ln 0.05 Ag 0.05 O 2-d materials were characterized via powder X-ray diffraction, scanning electron microscope, and electron diffraction spectroscopy. The characterization results indicate the formation of spherically shaped Ce 0.9 Ln 0.05 Ag 0.05 O 2-d nanostructured particles. As-prepared Ce 0.9-Ln 0.05 Ag 0.05 O 2-d materials were further tested toward multiple CO 2 splitting cycles by utilizing a thermogravimetric analyzer. The results obtained indicate that all the Ce 0.9 Ln 0.05 Ag 0.05 O 2-d materials produced higher quantities of O 2 and CO than the previously studied pure CeO 2 and lanthanide-doped ceria materials. Overall, the Ce 0.911 La 0.053 Ag 0.047 O 1.925 showed the maximum redox reactivity in terms of O 2 release (72.2 lmol/g cycle) and CO production (136.6 lmol/g cycle). List of symbols n O 2 Moles of O 2 (lmol/g) n CO Moles of CO (lmol/g) Dm loss Amount of loss in the mass (mg) Dm gain Amount of gain in the mass (mg) M O 2 Molecular weight of O 2 (g/mol) M O

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A decade of ceria based solar thermochemical H2O/CO2 splitting cycle

Cited by 140 publications

References 78 publications

Non-Stoichiometric Redox Active Perovskite Materials for Solar Thermochemical Fuel Production: A Review

Non-Stoichiometric Redox Active Perovskite Materials for Solar Thermochemical Fuel Production: A Review

Research advances towards large-scale solar hydrogen production from water

Co-precipitation synthesized nanostructured Ce0.9Ln0.05Ag0.05O2−δ materials for solar thermochemical conversion of CO2 into fuels

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