研究目的
To investigate the fabrication and photoelectric performance of Ag2S quantum dots sensitized CdSe photoelectrodes, aiming to improve photoelectrochemical (PEC) performance by using narrow band-gap semiconductor CdSe as the sensitized substrate of Ag2S QDs.
研究成果
The CdSe/Ag2S photoelectrodes achieved higher current density compared to traditional TiO2 nanostructure based photoelectrode system, mainly attributed to CdSe as a sensitized substrate and Ag2S of narrow band gap to form a heterostructure, resulting in the expansion of the range of light absorption. The wheat-like CdSe nanorod array can better load photosensitizer and show potential applications in solar cells.
研究不足
The additional QDs deposition leads to the formation of larger aggregates and results in more recombination phenomenon, thereby causing less efficiency in transferring electrons.
1：Experimental Design and Method Selection:
The wheat-like CdSe nanorods array was fabricated by electrodeposition method and sensitized with Ag2S quantum dots using the successive ionic layer adsorption and reaction (SILAR) method.
2：Sample Selection and Data Sources:
ITO substrate was used for the fabrication of CdSe nanorods array. The samples were characterized by XRD, UV–vis absorption spectroscopy, FESEM, HRTEM, EDX, XPS, and EIS.
3：List of Experimental Equipment and Materials:
Mixed solution containing CdSO4, Na2SeO3, Na2SO4, and H2SO4 for electrodeposition; AgNO3 and Na2S solutions for SILAR method; electrochemical workstation (CH Instruments, model CHI660E) for EIS and PEC measurements; 500 W xenon lamp for sunlight simulation.
4：Experimental Procedures and Operational Workflow:
The CdSe nanorods array was prepared on ITO substrate by electrodeposition. Ag2S QDs were grown on the CdSe nanorods array by SILAR method. The photoelectrodes were annealed and characterized.
5：Data Analysis Methods:
The PEC performance was evaluated by current density-voltage (J-V) curves and photoresponse measurements. EIS was used to analyze the charge transfer dynamics.
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