The role of iron oxide on the electronic and electrical properties of nitrogenated reduced graphene oxide: experimental and density functional theory approach

Idisi, David O.; Meyer, Edson L.; Benecha, Evans M.

doi:10.1007/s10854-024-11947-4

Cited by 3 publications

(1 citation statement)

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“…This underscores the vital role of Fe–O interactions in influencing the electronic conductivity of the material. The broadening of unoccupied states around the valence band in D-SFN implies an augmentation in charge transfer [ 34 , 35 ]. Introducing Sr defects leads to an increase in the Fe valence states, resulting in an amplified overlap of Fe 3 d and O 2 p orbitals near the Fermi level.…”

Section: Resultsmentioning

confidence: 99%

Rational Design of Ruddlesden–Popper Perovskite Ferrites as Air Electrode for Highly Active and Durable Reversible Protonic Ceramic Cells

Yu,

Bello,

Chen

et al. 2024

Nano-Micro Lett.

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Reversible protonic ceramic cells (RePCCs) hold promise for efficient energy storage, but their practicality is hindered by a lack of high-performance air electrode materials. Ruddlesden–Popper perovskite Sr3Fe2O7−δ (SF) exhibits superior proton uptake and rapid ionic conduction, boosting activity. However, excessive proton uptake during RePCC operation degrades SF’s crystal structure, impacting durability. This study introduces a novel A/B-sites co-substitution strategy for modifying air electrodes, incorporating Sr-deficiency and Nb-substitution to create Sr2.8Fe1.8Nb0.2O7−δ (D-SFN). Nb stabilizes SF's crystal, curbing excessive phase formation, and Sr-deficiency boosts oxygen vacancy concentration, optimizing oxygen transport. The D-SFN electrode demonstrates outstanding activity and durability, achieving a peak power density of 596 mW cm−2 in fuel cell mode and a current density of − 1.19 A cm−2 in electrolysis mode at 1.3 V, 650 °C, with excellent cycling durability. This approach holds the potential for advancing robust and efficient air electrodes in RePCCs for renewable energy storage.

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Section: Resultsmentioning

confidence: 99%