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<p>The development of stable, high-density electrode materials for use in advanced electrochemical energy storage systems is of utmost importance. This study presents a simple one-step chemical precipitation approach for the fabrication of Bi₂(Se₀.<sub>8</sub>S₀.₂)₃@C, a sulfur-modified bismuth selenide solid solution coupled with amorphous carbon. The presence of crystalline bismuth selenosulfide was verified through structural investigation. Morphological analysis revealed a network of nanosheets embedded within a carbon matrix, facilitating enhanced charge transfer and providing abundant electroactive sites. Electrochemical testing in a 3&#xa0;M KOH electrolyte showed that the Bi₂(Se₀.₈S₀.₂)₃@C electrode achieved a specific capacitance of 950&#xa0;F g⁻¹ at 1&#xa0;A g⁻¹ and exhibited excellent cycling stability, retaining 98% of its capacitance after 5000 cycles with nearly 100% efficiency. An asymmetric supercapacitor device, using activated carbon as the negative electrode and Bi₂(Se₀.<sub>8</sub>S₀.₂)₃@C as the positive electrode, delivered a maximum energy density of 65 Wh kg⁻¹ at 877&#xa0;W kg⁻¹ and 35 Wh kg⁻¹ at 3117&#xa0;W kg⁻¹. Furthermore, after just 20&#xa0;s of charging, two ASC coin cells connected in series were able to power multiple LEDs for approximately 10&#xa0;min, demonstrating excellent power delivery and rapid energy storage capability. These results indicate that asymmetric supercapacitors based on sulfur-modified bismuth selenide–carbon composite electrodes can be highly effective. In addition, Bi₂(Se₀0.8&#xa0;S₀.₂)₃@C shows enhanced photocatalytic performance with ~ 92% MB degradation, higher rate constant (0.0761&#xa0;min⁻¹), and excellent stability over five cycles due to improved charge separation.</p>

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Dual-functional Bi₂(Se₀0.8 S₀.₂)₃@C composite for high-performance supercapacitors and visible-light photocatalytic MB degradation

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • A. Parveen,
  • N. Surumbarkuzhali,
  • D. Anitha Kumari,
  • R. Kanimozhi,
  • Arumugam Krishnan Arulmozhi

摘要

The development of stable, high-density electrode materials for use in advanced electrochemical energy storage systems is of utmost importance. This study presents a simple one-step chemical precipitation approach for the fabrication of Bi₂(Se₀.8S₀.₂)₃@C, a sulfur-modified bismuth selenide solid solution coupled with amorphous carbon. The presence of crystalline bismuth selenosulfide was verified through structural investigation. Morphological analysis revealed a network of nanosheets embedded within a carbon matrix, facilitating enhanced charge transfer and providing abundant electroactive sites. Electrochemical testing in a 3 M KOH electrolyte showed that the Bi₂(Se₀.₈S₀.₂)₃@C electrode achieved a specific capacitance of 950 F g⁻¹ at 1 A g⁻¹ and exhibited excellent cycling stability, retaining 98% of its capacitance after 5000 cycles with nearly 100% efficiency. An asymmetric supercapacitor device, using activated carbon as the negative electrode and Bi₂(Se₀.8S₀.₂)₃@C as the positive electrode, delivered a maximum energy density of 65 Wh kg⁻¹ at 877 W kg⁻¹ and 35 Wh kg⁻¹ at 3117 W kg⁻¹. Furthermore, after just 20 s of charging, two ASC coin cells connected in series were able to power multiple LEDs for approximately 10 min, demonstrating excellent power delivery and rapid energy storage capability. These results indicate that asymmetric supercapacitors based on sulfur-modified bismuth selenide–carbon composite electrodes can be highly effective. In addition, Bi₂(Se₀0.8 S₀.₂)₃@C shows enhanced photocatalytic performance with ~ 92% MB degradation, higher rate constant (0.0761 min⁻¹), and excellent stability over five cycles due to improved charge separation.