研究目的
Investigating the enhancement of photoelectrochemical (PEC) water oxidation performance through the modification of WO3 nanoflakes with N doped carbon dots (NCDs).
研究成果
The NCDs/WO3 photoanode demonstrated a significant enhancement in PEC performance, with a photocurrent density 2.25 times higher than that of pristine WO3 and a cathodic shift in onset potential by 70 mV. This improvement is attributed to enhanced conductivity and electrochemical activity surface area due to N doping. The study presents a promising strategy for improving PEC water oxidation through heteroatom doping of carbon materials.
研究不足
The study focuses on the modification of WO3 with NCDs and its impact on PEC performance, but does not explore the long-term stability under operational conditions or the scalability of the synthesis method for industrial applications.
1：Experimental Design and Method Selection:
The study employed an impregnation method to construct NCDs/WO3 photoanodes. The methodology included the synthesis of WO3 nanoflakes via a seed-mediated hydrothermal method and NCDs via a refluxing method.
2：Sample Selection and Data Sources:
The samples included pristine WO3 nanoflakes, CDs/WO3, and NCDs/WO3 photoanodes. The photoelectrochemical performance was evaluated in a 1 m H2SO4 solution under AM
3：5 G irradiation. List of Experimental Equipment and Materials:
Equipment included FEI Quanta 250 FEG for SEM, FEI/Philips Tecnai G2 20 for TEM, F-4600 luminescence spectrometer for PL spectra, U-4100 spectrophotometer for UV–vis spectra, Nicolet iS5 FT-IR spectrometer, Thermo Scientific K-Alpha X-ray photoelectron spectrometer for XPS, and Bruker D8 diffractometer for XRD. Materials included H2WO4, PVA, H2O2, urea, oxalic acid, acetonitrile, HCl, and C3N
4：Experimental Procedures and Operational Workflow:
The WO3 nanoflakes were synthesized and then modified with NCDs via impregnation. The PEC performance was measured using a three-electrode system with SCE as the reference electrode, Pt sheet as the counter electrode, and the prepared photoanodes as the working electrode.
5：Data Analysis Methods:
The data analysis included linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), incident photo-to-current conversion efficiency (IPCE) measurements, and gas chromatography for H2 detection.
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