| Popis: |
In the past decade, significant development has been made in the fabrication of new electrocatalysts for high-performance energy conversion and storage. Among various approaches, metal sulfides such as CuS and MnS have shown great potential as effective non precious electrocatalysts in tailoring the atomic and electronic structures of catalytically active materials toward enhanced electrocatalytic activity. We demonstrate here the use of CuS and MnS composites as cost-effective counter electrode material in Quantum-dot sensitized solar cells (QDSSCs). The introduced new composite material has been synthesized using simple and facile process of hydrothermal methods. The surface morphology, composition and composite structure have been confirmed by high-resolution scanning electron microscopy (HR-SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The composite CuS/MnS deposited on FTO substrate-based QDSSCs achieves superior power conversion efficiency (PCE) of 4.38% than those of bare CuS (3.71%) and MnS (2.02%) counter electrodes. The electrochemical analysis showed that the CuS/MnS/FTO composite shows a smaller charger-transfer resistance between the counter electrode/polysulfide electrolyte than the CuS and MnS electrodes, respectively. |
