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Enhanced sodium storage performance of silk fibroin‐derived hollow iron sulfide with potential window control
Author(s) -
Kim JaeChan,
Kang Woohyeon,
Kim DongWan
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6091
Subject(s) - sulfidation , electrode , materials science , electrochemistry , fibroin , chemical engineering , iron oxide , chemistry , analytical chemistry (journal) , composite material , chromatography , metallurgy , silk , sulfur , engineering
Summary In this study, we developed iron sulfide (Fe 7 S 8 ) hollow mesocrystals (HMs) for sodium‐ion battery application using silk fibroin‐derived iron oxide (Fe 2 O 3 ) via a simple sulfidation process. The Fe 7 S 8 HM electrodes exhibited a high specific capacity of 654 mA h g −1 at the current density of 0.5 A g −1 over the potential window of 0.01 to 3 V during the first cycle. However, rapid capacity decay was observed during 200 cycles. Thus, to improve the cycling stability, we performed additional electrochemical measurements with a limited potential window of 0.4 to 3 V. The specific capacity of the Fe 7 S 8 HM electrodes decreased slightly to 530 mA h g −1 over the potential window of 0.4 to 3 V. The Fe 7 S 8 HM electrodes showed excellent cycle stability with 84% retention over 300 cycles. The Fe 7 S 8 HMs exhibited excellent Na storage performance and sufficient void space, which effectively suppressed their large volume changes by the synergetic effect with the tuned voltage window.