研究目的
To determine the electrochemical potential of plasmonic nano-structures for photoelectrochemical energy conversions using single layer graphene and to understand the relationship between the photoenergy conversion ability and the Fermi level of the plasmonic structure.
研究成果
The study successfully clarified the detailed energy diagram and charge transfer process for the plasmonic photoconversion electrode using graphene. It demonstrated the importance of the interface between the plasmonic electrode and the semiconductor electrode and highlighted the control of the hole consumption process as key for achieving high efficiency.
研究不足
The study acknowledges the difficulty in controlling the activity of plasmonic photocurrent generations due to microscopic, electronic, and geometrical structural differences in the active sites.
1：Experimental Design and Method Selection
The study employed electrochemical Raman measurements of graphene under near-infrared light to monitor the G and 2D Raman bands, revealing the relationship between photoenergy conversion ability and the Fermi level of plasmonic structures.
2：Sample Selection and Data Sources
Single layer graphene was synthesized on a copper foil via the chemical vapor deposition method and transferred onto the surface of Au/TiO2 substrates. The substrates were prepared with various structures to investigate their photoconversion abilities.
3：List of Experimental Equipment and Materials
Confocal Raman microscope with a 785 nm laser, SEM (JSM-6700FT; JEOL Ltd.), potentiostat with potential programmer (HZ-5000; Hokuto Denko), and a three-electrode photochemical cell.
4：Experimental Procedures and Operational Workflow
Raman spectra were collected under electrochemical potential control, with the laser turned on 10 s after the potential was applied to achieve equilibrium. The surface of the electrode was analyzed by SEM.
5：Data Analysis Methods
The analysis involved monitoring shifts in the G and 2D Raman bands of graphene to estimate the electrochemical potential of the Fermi level of plasmonic metal nanostructures.
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