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<p>The development of cost-effective and high-performance electrode materials is vital for next-generation supercapacitors. In this work, cobalt hexacyanoferrate (CoHCF) nanoparticles were uniformly anchored onto sulfur-doped reduced graphene oxide (S-rGO) via a simple co-precipitation route to construct a conductive, defect-rich hybrid electrode. Structural analyses validated the integrity of the preserved CoHCF framework, demonstrated successful S-doping, and confirmed the development of robust CoHCF/S-rGO interfacial interactions.&#xa0;The CoHCF/S-rGO electrode, benefiting from the superior electrical conductivity, numerous active sites, and improved ion/electron transport of the S-rGO network, exhibited an outstanding specific capacitance of 512&#xa0;F g<sup>− 1</sup> at 1&#xa0;A g<sup>− 1</sup>, a minimal charge-transfer resistance of 6.8 Ω, and a Coulombic efficiency surpassing 95% in a three-electrode setup. The asymmetric supercapacitor (CoHCF/S-rGO // AC) demonstrated a specific capacitance of 178&#xa0;F g<sup>− 1</sup> at 1&#xa0;A g<sup>− 1</sup>, an energy density of 63 Wh kg<sup>− 1</sup>, and remarkable cycling stability, retaining nearly 95% of its capacitance after 5000 cycles. The improved electrochemical performance is ascribed to the synergistic effect of S doping, which enhances electrical conductivity, mitigates CoHCF agglomeration, and elevates the density of electroactive sites. The results indicate that the CoHCF/S-rGO hybrid is a viable electrode material for sophisticated and long-lasting supercapacitor applications.</p>

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Boosting the electrochemical performance of cobalt hexacyanoferrate via sulfur-doped reduced graphene oxide hybridization

  • 期刊论文

  • 发表日期：

    2026年1月31日

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  • K. Arunkumar,
  • D. Kamalakkannan,
  • P. Kamalarajan,
  • K. Chanthirasekaran,
  • S. Kumaran,
  • Cmak Zeelan Basha

摘要

The development of cost-effective and high-performance electrode materials is vital for next-generation supercapacitors. In this work, cobalt hexacyanoferrate (CoHCF) nanoparticles were uniformly anchored onto sulfur-doped reduced graphene oxide (S-rGO) via a simple co-precipitation route to construct a conductive, defect-rich hybrid electrode. Structural analyses validated the integrity of the preserved CoHCF framework, demonstrated successful S-doping, and confirmed the development of robust CoHCF/S-rGO interfacial interactions. The CoHCF/S-rGO electrode, benefiting from the superior electrical conductivity, numerous active sites, and improved ion/electron transport of the S-rGO network, exhibited an outstanding specific capacitance of 512 F g− 1 at 1 A g− 1, a minimal charge-transfer resistance of 6.8 Ω, and a Coulombic efficiency surpassing 95% in a three-electrode setup. The asymmetric supercapacitor (CoHCF/S-rGO // AC) demonstrated a specific capacitance of 178 F g− 1 at 1 A g− 1, an energy density of 63 Wh kg− 1, and remarkable cycling stability, retaining nearly 95% of its capacitance after 5000 cycles. The improved electrochemical performance is ascribed to the synergistic effect of S doping, which enhances electrical conductivity, mitigates CoHCF agglomeration, and elevates the density of electroactive sites. The results indicate that the CoHCF/S-rGO hybrid is a viable electrode material for sophisticated and long-lasting supercapacitor applications.