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Iron selenides are promising anode materials for high performance sodium storage due to their high theoretical capacities, cost-effectiveness, and natural abundance. Nevertheless, their practical applications are severely constrained by intrinsically low electronic conductivity, sluggish Na+ diffusion kinetics, and structural instability during repeated cycling. In this work, sandwiched structure FeSe2/rGO nanocomposite is prepared with a facile microwave-assisted hydrothermal method within only 5 min. The rationally designed layered structure not only suppresses nanoparticle agglomeration but also enlarges the specific surface area, thereby maximizing the accessibility of electrochemical active sites throughout the charge/ discharge process. Benefiting from this architecture, FeSe2/rGO exhibits accelerated reaction kinetics in ether-based electrolyte, characterized by reduced activation energy, enhanced Na+ diffusion coefficients, and improved charge transfer dynamics. When employed as an anode for sodium ion batteries (SIBs), FeSe2/rGO demonstrates outstanding electrochemical performance. The underlying Na-storage mechanism was further elucidated through comprehensive ex-situ characterizations. Moreover, by coupling FeSe2/rGO with active carbon (AC) as the cathode to construct sodium-ion capacitors (SICs), the assembled device delivers an impressive energy density of 124.2 Wh kg−1 and a high power density of 9975 W kg−1, along with excellent long-term durability (70.7% capacity retention after 8000 cycles). These results highlight the potential of the FeSe2/rGO-based architecture for nextgeneration high-performance electrochemical energy storage systems and offer valuable insights into the design of advanced electrode materials.

権利情報:

• In Copyright
  

  This document is the unedited Author’s version of a Submitted Manuscript subsequently accepted for publication in ACS Applied Energy Materials, copyright © 2026. To access the final published article, see https://doi.org/10.1021/acsaem.6c00145.

キーワード: FeSe2/rGO, microwave-assisted synthesis, anode materials, sodium ion batteries, sodium ion capacitors

刊行年月日: 2026-04-08

出版者: American Chemical Society (ACS)

掲載誌:

• ACS Applied Energy Materials (ISSN: 25740962) vol. 9 issue. 8 acsaem.6c00145

研究助成金:

• Ministry of Education, Culture, Sports, Science and Technology

原稿種別: 査読前原稿 (Author's original)

MDR DOI: https://doi.org/10.48505/nims.8678

公開URL: https://doi.org/10.1021/acsaem.6c00145

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更新時刻: 2026-10-26 09:27:29 +0900

MDRでの公開時刻: 2026-10-26 10:30:43 +0900