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<p>The energy-storage capacity, rate performance, and durability of the hybrid supercapacitors should be enhanced by using advanced electrode architectures. Here, a bifunctional material SrS–FeS heterostructure (SrS–FeS@CNT) was designed for supercapacitor energy storage and HER electrocatalysis. The novelty of this research is the synthesis of a binary SrS–FeS sulfide heterostructure, incorporated with a conductive CNT framework, which consists of two redox-active sites, SrS and FeS, and the conductive CNT framework, which enhances the transportation of ions and electrons, electrolyte permeability, and charge-transfer kinetics. Finally, phase formation, surface morphology, chemical state, textural, and charge-transfer characteristics were confirmed by XRD, SEM, Raman, XPS, BET, and EIS measurements, respectively. The electrochemical analysis was performed in 1&#xa0;M KOH with a three and two-electrode measurement scheme. The CV-derived specific capacity for the optimized SrS–FeS@CNT electrode was 935.97&#xa0;C g⁻¹, and the GCD-derived specific capacity was 925.63&#xa0;C g⁻¹. The specific capacity of the assembled SrS–FeS@CNT//AC asymmetric device was 336.46&#xa0;C g⁻¹, and the maximum energy density (E<sub>d</sub>) and power density (P<sub>d</sub>) were 45.76 Wh kg⁻¹ at 1723.4&#xa0;W kg⁻¹ and 2591&#xa0;W kg⁻¹ at 15.93 Wh kg⁻¹, respectively. The capacity retention rate of the device was 91.36% with 95.74% Coulombic efficiency. Furthermore, SrS–FeS@CNT showed HER activity with the lowest overpotential of 54 mV and a Tafel slope of 48 mV dec⁻¹. These results show that embedding of CNTs in SrS–FeS heterostructure is an effective method to enhance charge storage, interfacial reaction kinetics, and electrocatalytic activity.</p>

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Conductive CNT-doped SrS–FeS heterostructures for advanced hybrid supercapacitors and HER electrocatalysis

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Asad Iqbal,
  • Muhammad Ali Hamza Shahbaz,
  • Areej S. Alqarni,
  • Amir Muhammad Afzal,
  • Sohail Mumtaz

摘要

The energy-storage capacity, rate performance, and durability of the hybrid supercapacitors should be enhanced by using advanced electrode architectures. Here, a bifunctional material SrS–FeS heterostructure (SrS–FeS@CNT) was designed for supercapacitor energy storage and HER electrocatalysis. The novelty of this research is the synthesis of a binary SrS–FeS sulfide heterostructure, incorporated with a conductive CNT framework, which consists of two redox-active sites, SrS and FeS, and the conductive CNT framework, which enhances the transportation of ions and electrons, electrolyte permeability, and charge-transfer kinetics. Finally, phase formation, surface morphology, chemical state, textural, and charge-transfer characteristics were confirmed by XRD, SEM, Raman, XPS, BET, and EIS measurements, respectively. The electrochemical analysis was performed in 1 M KOH with a three and two-electrode measurement scheme. The CV-derived specific capacity for the optimized SrS–FeS@CNT electrode was 935.97 C g⁻¹, and the GCD-derived specific capacity was 925.63 C g⁻¹. The specific capacity of the assembled SrS–FeS@CNT//AC asymmetric device was 336.46 C g⁻¹, and the maximum energy density (Ed) and power density (Pd) were 45.76 Wh kg⁻¹ at 1723.4 W kg⁻¹ and 2591 W kg⁻¹ at 15.93 Wh kg⁻¹, respectively. The capacity retention rate of the device was 91.36% with 95.74% Coulombic efficiency. Furthermore, SrS–FeS@CNT showed HER activity with the lowest overpotential of 54 mV and a Tafel slope of 48 mV dec⁻¹. These results show that embedding of CNTs in SrS–FeS heterostructure is an effective method to enhance charge storage, interfacial reaction kinetics, and electrocatalytic activity.