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• W4210311707 abstract "Cobalt hexacyanoferrate (CoHCF) is a potential cathode for aqueous Na-ion batteries due to its high theoretical specific capacity (170 mAh g−1); however, its lower rate capability and cyclability limit its applications. Structural distortion at a weak N-coordinated crystal field during cycling disintegrates Co, yielding an irreversible reaction. Different Zn amounts ranging 0–1 were added to the Co site to suppress the structural irreversibility of CoHCF, yielding Co1-xZnxHCF powder; this Zn (x ≤ 0.09) addition reduced the powder’s dimension because the lower four coordination of Zn–N, not the six coordination of Co–N, limits the powder growth. Simultaneously, a small lattice parameter and interaxial angle (∼90°) are obtained, implying that a narrower Co1−xZnxHCF inner structure is formed to accommodate Na ions. Moreover, the electronic conductivity of Co1−xZnxHCF gradually increased within 0–0.09 range. A smaller particle size with a high surface area leads to a near-surface-limited redox process, similar to a capacitive reaction. Both the surface-limited reaction and electronic conductivity enhances the reversibility due to the smaller charge transfer resistance at the electrode/electrolyte interface caused by Zn addition. Replacing redox-active Co with non-active Zn amount of 0.07 (Co0.93Zn0.07HCF) slightly reduces the specific capacity from 127 to 119 mAh g−1 at 0.1 A g−1 due to the shrunken Co charging sites. Rate performance is enhanced by compromising the capacity and reduced distortion, resulting in 81% retention at a 20-times-faster charging rate. Notably, the Co0.93Zn0.07HCF sample exhibited the good stability while preserving 74% of the initial capacity at 0.5 A g−1 after 200 cycles." @default.
• W4210311707 created "2022-02-08" @default.
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• W4210311707 date "2022-06-01" @default.
• W4210311707 modified "2023-10-15" @default.
• W4210311707 title "Enhanced stability and rate performance of zinc-doped cobalt hexacyanoferrate (CoZnHCF) by the limited crystal growth and reduced distortion" @default.
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• W4210311707 doi "https://doi.org/10.1016/j.jechem.2022.01.034" @default.
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