研究目的
Investigating the fabrication and performance of a composite counter electrode of graphene nanosheets grafted cobalt sulfide for dye-sensitized solar cells (DSSCs).
研究成果
The composite counter electrode of graphene nanosheets grafted cobalt sulfide exhibited remarkable electrochemical ability toward triiodide reduction reaction, achieving a power conversion efficiency of 7.28%. This improvement is attributed to the increased surface area, active sites, and conductivity provided by the grafting of CoS on graphene nanosheets.
研究不足
The study focuses on the performance of the composite counter electrode in DSSCs but does not explore its application in other types of solar cells or its long-term stability under various environmental conditions.
1：Experimental Design and Method Selection:
A composite counter electrode of graphene nanosheets grafted cobalt sulfide was fabricated through a facile synthetic route.
2：Sample Selection and Data Sources:
Graphene nanosheets (Gns) were synthesized via a modified hummers approach. Cobalt sulfide nanoparticles were grafted on the surface of graphene nanosheets.
3：List of Experimental Equipment and Materials:
SEM (Hitachi S4800), TEM (Tecnai G2 F20), XRD (Rigaku Ultima IV), XPS (ESCALAB250), EIS (IM6 workstation).
4：Experimental Procedures and Operational Workflow:
The composite was synthesized, characterized, and used as a counter electrode in DSSCs. The photovoltaic performance was evaluated.
5：Data Analysis Methods:
The electrochemical catalytic performance was analyzed using CV, EIS, and Tafel polarization.
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Transmission electron microscope
Tecnai G2 F20
FEI
High-resolution imaging of nanostructures
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X-ray diffractogram
Rigaku Ultima IV
Rigaku
Crystallographic analysis
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X-ray photoelectron spectrometer
ESCALAB250
Thermo Fisher Scientific
Surface chemistry and elemental oxidization analysis
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Scanning electron microscope
Hitachi S4800
Hitachi
Morphological analysis of materials
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Electrochemical impedance spectroscopy workstation
IM6
Zahner instrument
Electrochemical performance analysis
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