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Title: Novel acetic acid induced Na-rich Prussian blue nanocubes with iron defects as cathodes for sodium ion batteries
Authors: Li, Lan
Nie, Ping
Chen, Yubo
Wang, Jie
Keywords: Engineering::Materials
Issue Date: 2019
Source: Li, L., Nie, P., Chen, Y. & Wang, J. (2019). Novel acetic acid induced Na-rich Prussian blue nanocubes with iron defects as cathodes for sodium ion batteries. Journal of Materials Chemistry A, 7(19), 12134-12144.
Journal: Journal of Materials Chemistry A
Abstract: The Prussian blue cathode has great potential for use in sodium-ion batteries in view of its high gravimetric capacity, facile synthetic procedure and low cost. The main challenges for Prussian blue are the structural degradation caused by [Fe(CN)₆] vacancies and coordinated water in its lattice and low average voltage due to insufficient activation of low-spin FeLS(C) redox-couple reactions. Here, Na-enriched Prussian blue with low coordinated water and free [Fe(CN)₆] vacancies has been successfully synthesized by defect engineering, using acetic acid as an iron defect inducer. In particular, Na-rich Na₃.₂₇Fe₀.₃₅[Fe(CN)₆]·0.85H₂O nanocubes with hole centres, low amounts of coordinated water and free [Fe(CN)₆] vacancies exhibit a high specific capacity, impressive cycling stability and good coulombic efficiency. This Na-rich material shows a low charge-transfer resistance (201.1 Ω), a high Na+ apparent diffusion coefficient (3.56 × 10⁻¹¹cm²s⁻¹) and an additional capacity contribution at approximately 4.1 V, demonstrating the sufficient activation of low-spin FeLS(C) redox couples in Na-involved reactions. The Na₃.₂₇Fe₀.₃₅[Fe(CN)₆]·0.85H₂O cathode undergoes a reversible redox reaction, which converts the structure from cubic Na₂Fe₀.₃₅[Fe(CN)₆] to rhombohedral Na₃.₂₄Fe₀.₃₅[Fe(CN)₆]. More significantly, this work for the first time realizes the rational composition and architecture design of Prussian blue materials by defect engineering for a broad range of potential applications.
ISSN: 2050-7488
DOI: 10.1039/C9TA01965K
Rights: © 2019 The Royal Society of Chemistry. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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