研究目的
Investigating the synthesis and characterization of V2O5 nanobelt bundles containing plasmonic Ag for photoelectrochemical water splitting under visible light irradiation.
研究成果
The study successfully synthesized V2O5 NBBs with uniform morphologies and incorporated plasmonic Ag NWs to enhance PEC water-splitting activity. The addition of methanol as a hole scavenger significantly improved photocurrents. The V2O5 NBBs containing plasmonic Ag in KOH and methanol achieved the lowest charge transfer resistance and highest photocurrent density, demonstrating superior water-splitting activity. Future research will focus on enhancing the long-term stability of the photoanodes.
研究不足
The study acknowledges the poor electrical conductivity and slow oxygen evolution reaction kinetics of V2O5 nanostructures as limitations. Additionally, the photocurrents achieved were relatively low, indicating room for improvement in PEC activity and stability.
1：Experimental Design and Method Selection:
The study involved the synthesis of V2O5 nanobelt bundles (NBBs) via a room-temperature aqueous solution technique and the incorporation of plasmonic Ag nanowires (NWs) to enhance photoelectrochemical (PEC) water-splitting activity.
2：Sample Selection and Data Sources:
Commercial V2O5 powder was used as the starting material for the synthesis of V2O5 NBBs. Plasmonic Ag NWs were synthesized separately and mixed with V2O5 NBBs to prepare photoanodes.
3：List of Experimental Equipment and Materials:
Equipment included X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution TEM (HR-TEM), UV–Vis spectrophotometry, X-ray photoelectron spectroscopy (XPS), and a potentiostat for PEC studies. Materials included silver nitrate (AgNO3), copper chloride (CuCl2), sodium chloride (NaCl), ammonium metavanadate (NH4VO3), ethanol (C2H5OH), polyvinylpyrrolidone (PVP), sodium hydroxide, acetone (C3H6O), and ethylene glycol (EG).
4：Experimental Procedures and Operational Workflow:
The synthesis of V2O5 NBBs involved stirring V2O5 powder in a 2 M NaCl solution at room temperature. Plasmonic Ag NWs were synthesized via a polyol process. Photoanodes were prepared by spin-coating mixtures of Ag NWs and V2O5 NBBs onto ITO conductive glass substrates. PEC water-splitting activity was tested in
5：1 M KOH electrolyte with and without methanol as a hole scavenger. Data Analysis Methods:
The crystalline structure, morphology, optical properties, and chemical composition of the synthesized materials were characterized using XRD, SEM, TEM, HR-TEM, UV–Vis spectrophotometry, and XPS. PEC activity was evaluated through electrochemical impedance spectroscopy (EIS), Tafel analysis, cyclic voltammetry (C–V), linear sweep voltammetry (I–V), and amperometric I-t analysis.
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