研究目的
Investigating the use of ThCr2Si2-type quaternary chalcogenides as efficient Pt-free counter electrodes for dye-sensitized solar cells.
研究成果
The study demonstrated that ThCr2Si2-type chalcogenides, specifically K2FeCu3Se4, can be promising low-cost candidate catalysts to replace the costly Pt counter electrode in DSSCs, achieving a PCE of 5.07%.
研究不足
The conductivities of the semiconducting K2FeCu3Q4 films are poor compared to metallic Pt, limiting the diffusion and exchange of photo-generated electrons. The small surface areas of the films could reduce their electrocatalytic activities.
1：Experimental Design and Method Selection
The study utilized hydrothermal synthesis for the preparation of K2FeCu3Q4 nanoparticles, followed by spraying the nanoparticles on ITO glass and vacuum sintering to fabricate the films. XPS, Mott-Schottky analysis, CV, and EIS were performed to analyze the materials.
2：Sample Selection and Data Sources
K2FeCu3Q4 (Q for S and Se) nanoparticles were synthesized and used as counter electrodes in DSSCs. The performance was compared with Pt counter electrodes.
3：List of Experimental Equipment and Materials
X-ray diffractometer (Rigaku D/Max-2000), SEM (FEI Quanta 200F), XPS (Axis Ultra spectrometer), UV-3100 Shimadzu ultraviolet visible-infrared spectrophotometer, electrochemical workstation (CHI750E, CH Instruments).
4：Experimental Procedures and Operational Workflow
The nanoparticles were synthesized, characterized, and then used to fabricate films on ITO glass. The films were tested for their photovoltaic performance in DSSCs under simulated sunlight.
5：Data Analysis Methods
The data were analyzed using Zsimpwin software for EIS curves fitting. The photovoltaic parameters were compared to evaluate the performance of the counter electrodes.
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