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<p>Quantum dot-sensitized solar cells (QDSSCs) are equipped with counter electrodes (CEs) based on reduced graphene oxide (rGO) and nickel sulfide (NiS/rGO). A hydrothermal method performed at 150&#xa0;°C with variable reaction times (5, 10, and 15&#xa0;h) was used to synthesize NiS/rGO CEs and evaluate their electrocatalytic activity and stability by exposing them to varying conditions at 25, 40, 60, and 80&#xa0;°C for 100&#xa0;h. Electrochemical performance was assessed through cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization. Results showed that NiS/rGO 5&#xa0;h exhibited superior electrocatalytic activity, achieving a significantly higher current density. CV results showed that NiS/rGO 5&#xa0;h generated the highest current density of 112.4&#xa0;mA/cm<sup>2</sup> at 80&#xa0;°C (Pt = 8.1&#xa0;mA/cm<sup>2</sup>), and lower charge-transfer resistance (<i>R</i><sub><i>ct</i></sub> values, 3.6 Ω&#xa0;cm<sup>2</sup> at 80&#xa0;°C than (Pt = 674.4 Ω&#xa0;cm<sup>2</sup>). The high performance was attributed to the dominance of <i>β</i>-NiS phase. Additionally, the nanocomposites demonstrated strong mechanical adhesion and stability under prolonged exposure to elevated temperatures. This study highlights the potential of NiS/rGO nanocomposites as cost-effective and efficient alternatives to Pt for improved QDSSC performance.</p>

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Effect of temperature on the stability of nickel sulfide reduced graphene oxide nanocomposite counter electrode in quantum dot-sensitized solar cells

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月8日

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  • Layla Haythoor Kharboot,
  • Abdillah Sani Mohd Najib,
  • Tuty Asma Abu Bakar,
  • Norhuda Hidayah Nordin,
  • Andi Erwin Eka Putra,
  • Ataf Ali Altaf,
  • Nor Akmal Fadil

摘要

Quantum dot-sensitized solar cells (QDSSCs) are equipped with counter electrodes (CEs) based on reduced graphene oxide (rGO) and nickel sulfide (NiS/rGO). A hydrothermal method performed at 150 °C with variable reaction times (5, 10, and 15 h) was used to synthesize NiS/rGO CEs and evaluate their electrocatalytic activity and stability by exposing them to varying conditions at 25, 40, 60, and 80 °C for 100 h. Electrochemical performance was assessed through cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization. Results showed that NiS/rGO 5 h exhibited superior electrocatalytic activity, achieving a significantly higher current density. CV results showed that NiS/rGO 5 h generated the highest current density of 112.4 mA/cm2 at 80 °C (Pt = 8.1 mA/cm2), and lower charge-transfer resistance (Rct values, 3.6 Ω cm2 at 80 °C than (Pt = 674.4 Ω cm2). The high performance was attributed to the dominance of β-NiS phase. Additionally, the nanocomposites demonstrated strong mechanical adhesion and stability under prolonged exposure to elevated temperatures. This study highlights the potential of NiS/rGO nanocomposites as cost-effective and efficient alternatives to Pt for improved QDSSC performance.