A Ternary Fe1−xS@Porous Carbon Nanowires/Reduced Graphene Oxide Hybrid Film Electrode with Superior Volumetric and Gravimetric Capacities for Flexible Sodium Ion Batteries |
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Authors: | Yang Liu Yongjin Fang Zhiwei Zhao Changzhou Yuan Xiong Wen Lou |
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Institution: | Yang Liu,Yongjin Fang,Zhiwei Zhao,Changzhou Yuan,Xiong Wen (David) Lou |
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Abstract: | Smart construction of ultraflexible electrodes with superior gravimetric and volumetric capacities is still challenging yet significant for sodium ion batteries (SIBs) toward wearable electronic devices. Herein, a hybrid film made of hierarchical Fe1?xS‐filled porous carbon nanowires/reduced graphene oxide (Fe1?xS@PCNWs/rGO) is synthesized through a facile assembly and sulfuration strategy. The resultant hybrid paper exhibits high flexibility and structural stability. The multidimensional paper architecture possesses several advantages, including rendering an efficient electron/ion transport network, buffering the volume expansion of Fe1?xS nanoparticles, mitigating the dissolution of polysulfides, and enabling superior kinetics toward efficient sodium storage. When evaluated as a self‐supporting anode for SIBs, the Fe1?xS@PCNWs/rGO paper electrode exhibits remarkable reversible capacities of 573–89 mAh g?1 over 100 consecutive cycles at 0.1 A g?1 with areal mass loadings of 0.9–11.2 mg cm?2 and high volumetric capacities of 424–180 mAh cm?3 in the current density range of 0.2–5 A g?1. More competitively, a SIB based on this flexible Fe1?xS@PCNWs/rGO anode demonstrates outstanding electrochemical properties, thus highlighting its enormous potential in versatile flexible and wearable applications. |
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Keywords: | anode flexible electrode iron sulfide sodium ion batteries |
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