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<p>In this study, a novel Pt-free counter electrode material CoS<sub>2</sub>@CoS<sub>1.097</sub>/NCSs is reported. It integrates nitrogen-doped hollow mesoporous carbon spheres (NCSs) with a cobalt sulfide heterojunction (CoS<sub>2</sub>@CoS<sub>1.097</sub>) to significantly enhance the power conversion efficiency (PCE) and cost-effectiveness of dye-sensitized solar cells (DSSCs). The composite was synthesized via a hydrothermal self-assembly strategy, and its dual-phase heterostructure and interfacial synergy were validated through XRD, Raman, XPS, and TEM analyses. Electrochemical tests indicated superior catalytic activity for I<sub>3</sub>⁻ reduction (charge transfer resistance, Rct ≈ 15.93 Ω·cm²), closely approaching that of Pt-based electrodes (15.78 Ω·cm²). DSSCs employing this counter electrode achieved a PCE of 7.53%, comparable to the Pt benchmark (8.39%), while offering advantages in scalability and reduced manufacturing costs. The study elucidates the conductivity enhancement mechanism of the nitrogen-doped carbon framework, the catalytic role of sulfur vacancies, and the charge separation effects at the heterojunction interface, providing new insights for designing high-performance Pt-free materials in renewable energy applications.</p>

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Synergistic CoS2@CoS1.097/NCSs hybrid counter electrodes for high-efficiency pt-free dye-sensitized solar cells

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Siyuan Li,
  • Lingyun Li,
  • Xu Liu,
  • Yanlai Wang,
  • Ligang Wang

摘要

In this study, a novel Pt-free counter electrode material CoS2@CoS1.097/NCSs is reported. It integrates nitrogen-doped hollow mesoporous carbon spheres (NCSs) with a cobalt sulfide heterojunction (CoS2@CoS1.097) to significantly enhance the power conversion efficiency (PCE) and cost-effectiveness of dye-sensitized solar cells (DSSCs). The composite was synthesized via a hydrothermal self-assembly strategy, and its dual-phase heterostructure and interfacial synergy were validated through XRD, Raman, XPS, and TEM analyses. Electrochemical tests indicated superior catalytic activity for I3⁻ reduction (charge transfer resistance, Rct ≈ 15.93 Ω·cm²), closely approaching that of Pt-based electrodes (15.78 Ω·cm²). DSSCs employing this counter electrode achieved a PCE of 7.53%, comparable to the Pt benchmark (8.39%), while offering advantages in scalability and reduced manufacturing costs. The study elucidates the conductivity enhancement mechanism of the nitrogen-doped carbon framework, the catalytic role of sulfur vacancies, and the charge separation effects at the heterojunction interface, providing new insights for designing high-performance Pt-free materials in renewable energy applications.