研究目的
To improve the photoelectrochemical oxygen evolution reaction (OER) activity of CuWO4-based photoanodes by constructing a network-structured CuWO4/BiVO4/Co-Pi nanocomposite with enhanced specific surface area, electron-hole separation, and charge transfer rates.
研究成果
The CuWO4/BiVO4/Co-Pi nanocomposite achieved a high photocurrent density of 2.25 mA·cm?2 at 1.23 V vs. RHE in neutral solution, attributed to its high specific surface area, efficient electron-hole separation via heterojunction, and improved charge transfer with Co-Pi co-catalyst, demonstrating a promising strategy for enhancing PEC water oxidation.
研究不足
The activity of CuWO4 is still lower than highly efficient photoanode materials; the method may not extend light absorption range due to similar bandgaps of CuWO4 and BiVO4; optimal BiVO4 thickness requires careful control to balance light absorption and activity.
1：Experimental Design and Method Selection:
The study involved preparing CuWO4/BiVO4 nanocomposites via drop-casting and thermal annealing methods, with CuWO4 nanoflakes as templates, and depositing Co-Pi as a co-catalyst using photo-assisted electrodeposition to enhance PEC OER performance.
2：Sample Selection and Data Sources:
Samples included WO3 nanoflakes grown on FTO substrates, converted to CuWO4, then to CuWO4/BiVO4 composites, with pure BiVO4 films as controls; all prepared on FTO substrates.
3：List of Experimental Equipment and Materials:
Materials included Cu(NO3)2·3H2O, tungsten powder, H2WO4, H2O2, ethanol, isopropanol, KOH, urea, acetonitrile, oxalic acid, HCl, acetic acid, Bi(NO3)3·5H2O, vanadyl acetylacetonate, deionized water, and FTO substrates. Equipment included SEM (Hitachi S-4800), TEM (JEM-2010F), XRD (Rigaku rint2000), UV-Vis spectrophotometer (Shimadzu 3600), and CHI660D electrochemical workstation with a xenon lamp.
4：Experimental Procedures and Operational Workflow:
WO3 NFs were hydrothermally grown on FTO, converted to CuWO4 via thermal reaction with Cu(NO3)2, then Bi precursor solution was drop-cast and annealed to form CuWO4/BiVO4; Co-Pi was electrodeposited; characterization and PEC measurements were performed.
5：Data Analysis Methods:
Data were analyzed using LSV for photocurrent density, UV-Vis for absorption, XRD for crystal structure, and SEM/TEM for morphology.
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