Enhanced sodium storage performance of silk fibroin-derived hollow iron sulfide with potential window control

Jae Chan Kim, Woohyeon Kang, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

In this study, we developed iron sulfide (Fe7S8) hollow mesocrystals (HMs) for sodium-ion battery application using silk fibroin-derived iron oxide (Fe2O3) via a simple sulfidation process. The Fe7S8 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 Fe7S8 HM electrodes decreased slightly to 530 mA h g−1 over the potential window of 0.4 to 3 V. The Fe7S8 HM electrodes showed excellent cycle stability with 84% retention over 300 cycles. The Fe7S8 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.

Original languageEnglish
Pages (from-to)4755-4764
Number of pages10
JournalInternational Journal of Energy Research
Volume45
Issue number3
DOIs
Publication statusPublished - 2021 Mar 10

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science, ICT, and Future Planning, South Korea (NRF‐2016M3A7B4909318). This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2020R1A6A1A03045059). We thank the Korea Basic Science Institute for the technical support.

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science, ICT, and Future Planning, South Korea (NRF-2016M3A7B4909318). This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2020R1A6A1A03045059). We thank the Korea Basic Science Institute for the technical support.

Funding Information:
National Research Foundation of Korea (NRF) funded by the Ministry of Education, South Korea, Grant/Award Number: NRF‐2020R1A6A1A03045059; National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT, South Korea, Grant/Award Number: NRF‐2019R1A2B5B02070203 Funding information

Publisher Copyright:
© 2020 John Wiley & Sons Ltd

Keywords

  • anodes
  • hollow structures
  • iron sulfides
  • sodium-ion batteries
  • voltage window

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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