Kharboot, Layla Haythoor and Mohd Najib, Abdillah Sani and Abu Bakar, Tuty Asma and Nordin, Norhuda Hidayah and Eka Putra, Andi Erwin and Altaf, Ataf Ali and Fadil, Nor Akmal (2026) Effect of temperature on the stability of nickel sulfide reduced graphene oxide nanocomposite counter electrode in quantum dot-sensitized solar cells. Journal of Materials Science: Materials in Electronics, 37 (7). pp. 1-21. ISSN 0957-4522 E-ISSN 1573-482X
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Abstract
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
| Item Type: | Article (Journal) |
|---|---|
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA170 Environmental engineering. Sustainable engineering |
| Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): | Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering Kulliyyah of Engineering |
| Depositing User: | DR NORHUDA HIDAYAH NORDIN |
| Date Deposited: | 14 Apr 2026 10:44 |
| Last Modified: | 14 Apr 2026 10:44 |
| Queue Number: | 2026-04-Q2766 |
| URI: | http://irep.iium.edu.my/id/eprint/128124 |
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