Scholarlink

<p>Room-temperature sodium–sulfur (RT Na–S) batteries are regarded as promising candidates for large-scale energy storage, owing to their high theoretical energy density, cost-effectiveness of constituent elements, and inherent environmental compatibility. However, the practical application of RT Na–S batteries remains hampered by intrinsic challenges, notably sluggish redox kinetics, and severe polysulfide shuttle effects. Herein, we report a functional cathode applied in RT Na–S batteries, which is designed from FeCoS<sub>2</sub> embedded in Prussian blue analogue-derived hollow carbon (FeCoS<sub>2</sub>/HC-700). FeCoS<sub>2</sub>/HC-700 was synthesized through carbonization and sulfurization of a Prussian blue analogue precursor with dopamine-derived coating. This engineered composite demonstrates a synergistic combination of strong chemisorption towards sodium polysulfides and enhanced redox kinetics, as evidenced by electrochemical characterization. Meanwhile, the abundant porous structures provide plenty of space, leading to a strong chemical interaction between FeCoS<sub>2</sub> and sulfur. As a result, the designed sulfur cathode delivers a superior reversible capacity of 352.22&#xa0;mAh&#xa0;g<sup>−1</sup> at 0.2&#xa0;A&#xa0;g<sup>−1</sup>. DFT calculations reveal that FeCoS<sub>2</sub> demonstrates a robust adsorption affinity toward Na<sub>2</sub>S while significantly reducing the decomposition energy barrier. Consequently, FeCoS<sub>2</sub>/HC-700 effectively suppresses the shuttle effect and enhances sulfur utilization efficiency.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Preparation of FeCoS2 embedded in hollow carbon catalysts for high-performance room-temperature sodium–sulfur batteries

  • 期刊论文

  • 发表日期：

    2025年7月11日

查看全文
  • Junyi Xiang,
  • Tongfeng Liu,
  • Guangxuan Wu,
  • Yirun Wang,
  • Ying Tang,
  • Liying Ma,
  • Enzuo Liu,
  • Jianli Kang,
  • Chunnian He,
  • Naiqin Zhao,
  • Wenbin Hu,
  • Biao Chen

摘要

Room-temperature sodium–sulfur (RT Na–S) batteries are regarded as promising candidates for large-scale energy storage, owing to their high theoretical energy density, cost-effectiveness of constituent elements, and inherent environmental compatibility. However, the practical application of RT Na–S batteries remains hampered by intrinsic challenges, notably sluggish redox kinetics, and severe polysulfide shuttle effects. Herein, we report a functional cathode applied in RT Na–S batteries, which is designed from FeCoS2 embedded in Prussian blue analogue-derived hollow carbon (FeCoS2/HC-700). FeCoS2/HC-700 was synthesized through carbonization and sulfurization of a Prussian blue analogue precursor with dopamine-derived coating. This engineered composite demonstrates a synergistic combination of strong chemisorption towards sodium polysulfides and enhanced redox kinetics, as evidenced by electrochemical characterization. Meanwhile, the abundant porous structures provide plenty of space, leading to a strong chemical interaction between FeCoS2 and sulfur. As a result, the designed sulfur cathode delivers a superior reversible capacity of 352.22 mAh g−1 at 0.2 A g−1. DFT calculations reveal that FeCoS2 demonstrates a robust adsorption affinity toward Na2S while significantly reducing the decomposition energy barrier. Consequently, FeCoS2/HC-700 effectively suppresses the shuttle effect and enhances sulfur utilization efficiency.