Journal
ELECTROCHIMICA ACTA
Volume 283, Issue -, Pages 683-690Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.07.017
Keywords
Iron sulfide; Graphene; Nanocubes; Hierarchical; Sodium ion full battery
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Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea [20168510050080]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) -Ministry of Science, ICT [2016R1C1B2007299]
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Hierarchical iron sulfide nanocubes consisting of multiple iron sulfide-carbon core-shell nanoparticles coated with few-layer graphene (Fe1-xS@C/rGO) were prepared by a two-step in-situ transformation strategy employing Prussian blue (PB) as a starting material. The hierarchical nanocubes delivered an outstanding rate capability of 323 mAh g(-1) at the current density of 10 A g(-1) when used as the anode of sodium ion half cells. An iron-based sodium-ion full cell composed of a hierarchical Fe1-xS@C/rGO anode and PB cathode had a capacity of 323 mAh g(-1) for 150 cycles. We attributed the good sodium ion storage properties of the Fe1-xS@C/rGO nanocubes to the stable hierarchical building structures and the high graphitization degree of carbon obtained during the transformation process. The graphene-coated nanocube structures inhibited the agglomeration of iron sulfide-carbon core-shell nanoparticles and accommodated the huge volume expansion that occurred during cycling. The high graphitization degree of carbon endowed Fe1-xS@C/rGO nanocubes with high electronic conductivity, facilitated sodium ion accessibility, and increased mechanical durability. (C) 2018 Elsevier Ltd. All rights reserved.
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