研究目的
To develop a low-cost and efficient counter electrode (CE) for dye-sensitized solar cells (DSSCs) using NiCo2S4/carbon nanofibers (NiCo2S4/CNFs) composites synthesized via hydrothermal and electrospinning methods.
研究成果
The NiCo2S4/CNFs composites exhibit superior performance as CEs in DSSCs, achieving a power conversion efficiency of 9.00%, which is higher than that of Pt-based CEs (7.48%). The enhanced performance is attributed to the synergistic effect between the catalytic activity of NiCo2S4 and the electrical conductivity of CNFs. This study demonstrates the potential of NiCo2S4/CNFs composites as cost-effective and efficient alternatives to Pt-based CEs in DSSCs.
研究不足
The study does not address the long-term stability of NiCo2S4/CNFs composites under operational conditions beyond the experimental timeframe. Additionally, the scalability of the synthesis process for industrial applications is not discussed.
1：Experimental Design and Method Selection:
The study employs hydrothermal and electrospinning methods to synthesize NiCo2S4/CNFs composites.
2：Sample Selection and Data Sources:
The materials used include Polyacrylonitrile (PAN), Nickel nitrate, Cobaltous Nitrate Hexahydrate, isopropyl alcohol, sulfourea, urea, N, N-dimenthvlformamide, and ethanol.
3：List of Experimental Equipment and Materials:
Equipment includes transmission electron microscopy (TEM), scanning electron microscope (SEM), X-ray diffractometer (XRD), energy dispersive spectrometer (EDS), X-ray photoelectron spectroscopy (XPS), and electrochemical workstation system (CHI 660E).
4：Experimental Procedures and Operational Workflow:
The synthesis involves electrospinning of CNFs followed by hydrothermal synthesis of NiCo2S4/CNFs composites. The composites are then used to fabricate CEs for DSSCs.
5：Data Analysis Methods:
The performance of the DSSCs is evaluated using cyclic voltammetry (CV), Tafel polarization, and current density-voltage (J-V) measurements.
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Polyacrylonitrile
Mw = 150,000
Sigma-Aldrich
Used as a precursor for the synthesis of carbon nanofibers.
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Transmission electron microscopy
TEM
FEI
Used to survey the morphology of NiCo2S4/CNFs composites.
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Scanning electron microscope
SEM
Hitachi
Used to survey the morphology of NiCo2S4/CNFs composites.
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X-ray diffractometer
XRD
Bruker
Used to detect the composition and phase of NiCo2S4/CNFs powder.
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Nickel nitrate
Ni(NO3)2·6H2O
Used in the hydrothermal synthesis of NiCo2S4/CNFs composites.
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Cobaltous Nitrate Hexahydrate
Co(NO3)2·6H2O
Used in the hydrothermal synthesis of NiCo2S4/CNFs composites.
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N, N-dimenthvlformamide
Sigma-Aldrich
Used as a solvent in the electrospinning process.
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Energy dispersive spectrometer
EDS
JEM-2100F
Used to detect the composition and phase of NiCo2S4/CNFs powder.
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X-ray photoelectron spectroscopy
XPS
Used to investigate the surface chemical composition and valence state of the composites.
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Electrochemical workstation system
CHI 660E
Chenhua
Used to conduct cyclic voltammetry (CV), Tafel polarization and Current density-Voltage (J-V) performance measurements.
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