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• W3043299227 endingPage "34872" @default.
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• W3043299227 abstract "The poor electronic conductivity of Na2FeSiO4 always limits its electrochemical reactivities and no effective solution has been found to date. Herein, the novel Ni-substituted Na2Fe1–xNixSiO4@C nanospheres (50–100 nm) encapsulated with a 3D hierarchical porous skeleton (named as alveolation-like configuration) constructed using in situ carbon are first synthesized via a facile sol–gel method, and the effects of Ni substitution combined with the design of a unique carbon network on Na-storage properties are assessed systematically, focusing on alleviating the inherent defects of the Na2FeSiO4 cathode material. A series of characterization technologies such as X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy and so forth, coupled with the electrochemical measurements and first-principles calculations, are used to explore the structure, morphology and electrochemical behaviors of the as-prepared materials. The results show that the synergism between Ni substitution and the special alveolation-like configuration enables fast Na ions mobility (from 10–14 to 10–12 cm2 s–1), reduces band gap energy (from 2.82 to 1.79 eV) and lowers Na-ion diffusion barriers, finally reciprocating the vigorous electrochemical kinetics of the electrode. Especially, the elaborately designed material—Na2Fe0.97Ni0.03SiO4@C—displays superior Na-storage properties of around 197.51 mA h g–1 (corresponding to 1.43 Na+ intercalation) at 0.1 C within 1.5–4.5 V along with desirable capacity retention (84.44% after 100 cycles), and the rate capability is also markedly enhanced (a capacity of 133.62 mA h g–1 at 2 C). Such the effective methodology employed in this work opens a potential pathway to synthesize the silicate cathode material with excellent electrochemical properties." @default.
• W3043299227 created "2020-07-23" @default.
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• W3043299227 date "2020-07-13" @default.
• W3043299227 modified "2023-10-14" @default.
• W3043299227 title "Superior Na-Storage Properties of Nickel-Substituted Na₂FeSiO₄@C Microspheres Encapsulated with the <i>In Situ</i>-Synthesized Alveolation-like Carbon Matrix" @default.
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• W3043299227 doi "https://doi.org/10.1021/acsami.0c07894" @default.
• W3043299227 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32657571" @default.
• W3043299227 hasPublicationYear "2020" @default.
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