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Abstract <p>To investigate the effect of selenization degree on the electrochemical performance of iron selenides, Fe<sub><i>x</i></sub>Se<sub><i>y</i></sub>/carbon composites with different selenization degrees are successfully synthesized via a solid-state reaction using ferric citrate as the precursor, by regulating the reaction temperature and Fe/Se molar ratio. Structural characterization reveals that reaction temperature is the key factor determining the phase composition: with increasing temperature, the selenization degree decreases gradually, showing a phase evolution law of FeSe<sub>2</sub> → Fe<sub>3</sub>Se<sub>4</sub> → Fe<sub>7</sub>Se<sub>8</sub>. Electrochemical tests indicate that Fe<sub>3</sub>Se<sub>4</sub> exhibited the optimal reversible capacity (754.5 mA h g<sup>–1</sup>) and cycling stability (86.7% capacity retention after 100 cycles) as lithium-ion batteries anode, attributed to the possible synergy between faradaic redox reactions and capacitive storage. In contrast, FeSe<sub>2</sub> possessing a better conductivity shows better capacity retention (75.0%) as sodium-ion batteries. These studies provide valuable insights for designing high-performance iron selenide-based anode materials for batteries.</p>

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Continuous Disproportionation Synthesis of FexSey/Carbon with Different Selenide Degree and Their Comparative Electrochemical Performances

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • Chenhao Zhao,
  • Junhao Zhao,
  • Fengzhang Tu

摘要

Abstract

To investigate the effect of selenization degree on the electrochemical performance of iron selenides, FexSey/carbon composites with different selenization degrees are successfully synthesized via a solid-state reaction using ferric citrate as the precursor, by regulating the reaction temperature and Fe/Se molar ratio. Structural characterization reveals that reaction temperature is the key factor determining the phase composition: with increasing temperature, the selenization degree decreases gradually, showing a phase evolution law of FeSe2 → Fe3Se4 → Fe7Se8. Electrochemical tests indicate that Fe3Se4 exhibited the optimal reversible capacity (754.5 mA h g–1) and cycling stability (86.7% capacity retention after 100 cycles) as lithium-ion batteries anode, attributed to the possible synergy between faradaic redox reactions and capacitive storage. In contrast, FeSe2 possessing a better conductivity shows better capacity retention (75.0%) as sodium-ion batteries. These studies provide valuable insights for designing high-performance iron selenide-based anode materials for batteries.