Development of storage materials for high-temperature rechargeable oxide batteries

Berger, Cornelius M.; Tokariev, O.; Orzessek, Peter; Hospach, A.; Fang, Qingping; Bram, Martin; Quadakkers, W. J.; Menzler, Norbert H.; Buchkremer, Hans Peter

doi:10.1016/j.est.2014.12.001

Cited by 35 publications

(40 citation statements)

References 22 publications

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“…Meanwhile, we employed the tape cast storage components in a ROB on the basis of a Jülich F‐10 fuel cell/electrolysis stack with a setup described elsewhere and established proof of concept . Regarding this, further electrochemical results are still pending and need to be evaluated in order to improve the storage design and performance.…”

Section: Discussionmentioning

confidence: 99%

“…These cost‐and‐efficiency considerations drive interest in an SOFC/SOEC system with an integrated storage for oxygen ions . An oxygen‐ion storage component can buffer the H 2 /H 2 O atmosphere within an rSOC.…”

Section: Introductionmentioning

confidence: 99%

“…However, in ROB operation, pure iron displays severe degradation such as particle coarsening and agglomeration due to sintering. Also, iron diffusion toward the surface occurs resulting in layer formation . Sintering results in a decreased surface and thus a decreased reaction rate and a loss of capacity.…”

Section: Introductionmentioning

confidence: 99%

“…These cost-and-efficiency considerations drive interest in an SOFC/SOEC system with an integrated storage for oxygen ions. [6][7][8][9][10][11] An oxygen-ion storage component can buffer the H 2 /H 2 O atmosphere within an rSOC. With the storage component the system does not need to be actively provided with fuel gas and gasses do not need to be removed.…”

Section: Introductionmentioning

confidence: 99%

“…Iron/iron oxide is a promising material for storing oxygen ions under given conditions. [6][7][8][9][10][11] At 800°C, the prevailing gas compositions (H 2 :H 2 O = 1:4-4:1) correspond to a range of oxygen partial pressure of 7 9 10 À16 -2.75 9 10 À18 kPa. Therein, iron undergoes a stepwise redox reaction according to Eqs.…”

Section: Introductionmentioning

confidence: 99%

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Calcium‐Iron Oxide as Energy Storage Medium in Rechargeable Oxide Batteries

et al. 2016

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Rechargeable oxide batteries (ROB) comprise a regenerative solid oxide cell (rSOC) and a storage medium for oxygen ions. A sealed ROB avoids pumping loss, heat loss, and gas purity expenses in comparison with conventional rSOC. However, the iron oxide base storage medium degrades during charging–discharging cycles. In comparison, CaFe3O5 has improved cyclability and a high reversible oxygen storage capacity of 22.3 mol%. In this study, we analyzed the redox mechanism of this compound. After a solid‐state synthesis of CaFe3O5, we verified the phase composition and studied the redox reaction by means of X‐ray diffraction, Mössbauer spectrometry, and scanning electron microscopy. Results show a great potential to operate the battery with this storage material during multiple charging–discharging cycles.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Calcium‐Iron Oxide as Energy Storage Medium in Rechargeable Oxide Batteries

et al. 2016

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Hierarchically Porous Iron Alloys with High Sintering Resistance During Cyclic Steam Oxidation and Hydrogen Reduction

Pennell,

Chappuis,

Carpenter

et al. 2023

Adv Funct Materials

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Hydrogen release/storage materials for iron/air batteries are fabricated as Fe‐16Mo and Fe‐24Ni (at.%) lattices via 3D‐extrusion printing of foamed inks containing oxide microparticles, followed by H2 reduction and sintering. A hierarchical open porosity is designed: (i) channels between walls created during printing, (ii) mesopores within walls, created during ink foaming, and (iii) micropores within ligaments between mesopores, created from partial sintering metal particles and gas escape during cycling. When subjected to H2/H2O redox cycling at 800 °C, the lattices of both compositions gradually undergo sintering. The Fe‐16Mo lattice remains fully redox‐active after 50 cycles unlike the Fe‐24Ni lattice, which loses 90% of its redox capacity after 30 cycles. The increased lifetime of the Fe‐16Mo lattice is attributed to the sintering inhibition of Mo, the formation of a mixture of oxide phases in the oxidized state, and the cyclic formation of submicron Fe2Mo by reduction of MoO2 and Fe2Mo3O8. The microstructure of the foamed walls is examined throughout cycling to track changes in morphology and composition. These are correlated to volume and porosity changes in the lattice. A comparison is made to previously‐studied Fe‐Mo and Fe‐Ni freeze‐cast lamellar foams, and variations in performance are discussed in the context of the different architectures.

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Tungsten's Role in Enhancing Sintering Resistance of Fe‐W Hierarchical Foams during Redox Cycling

Chen,

Pennell,

Dunand

2024

Adv Funct Materials

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Directional freeze‐cast Fe‐W lamellar foams with 10–33 at.% W show distinct microstructural evolutions during steam/hydrogen redox cycling between oxidized and reduced states at 800 ⁰C, depending on W concentration. The Fe‐18 W and Fe‐25 W foams exhibit a sufficient volume fraction of W‐rich phases – λ‐Fe2W to inhibit sintering for α‐Fe in the reduced state and FeWO4 to inhibit sintering for Fe3O4 in the oxidized state – thus forming ligaments comprising two phases (Fe/λ‐Fe2W and Fe3O4/FeWO4, respectively). In contrast, a Fe‐10 W foam with a lower volume fraction of W‐containing phases (λ‐Fe2W and FeWO4) shows lamellae densification as well as core‐shell structure formation, due to Fe outward diffusion during oxidation. While higher W concentration enhances the stability of lamellar structure in Fe‐W foams, degradation still occurs, via buckling of lamellae and swelling of foams after extensive cycling. In situ XRD characterization shows that W addition has a minor effect on the oxidation process but slows reduction due to the sluggish kinetics of FeWO4 reduction. This influence is mitigated by the formation of nanocrystalline W‐rich phases due to the chemical vapor transport (CVT) mechanism during the reduction of FeWO4 to boost the reaction kinetics during redox cycling.

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Development of storage materials for high-temperature rechargeable oxide batteries

Cited by 35 publications

References 22 publications

Calcium‐Iron Oxide as Energy Storage Medium in Rechargeable Oxide Batteries

Calcium‐Iron Oxide as Energy Storage Medium in Rechargeable Oxide Batteries

Hierarchically Porous Iron Alloys with High Sintering Resistance During Cyclic Steam Oxidation and Hydrogen Reduction

Tungsten's Role in Enhancing Sintering Resistance of Fe‐W Hierarchical Foams during Redox Cycling

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