研究目的
Investigating the enhancement of photoelectrochemical water splitting performance through the development of plasmonic WO3?x electrodes with tunable localized surface plasmon resonance (LSPR) in the visible-to-near-infrared region.
研究成果
The study successfully demonstrates a novel AIMR method to fabricate WO3?x electrodes with tunable LSPR in the Vis–NIR region, significantly enhancing PEC water splitting performance. The optimal WO3?x electrode achieves a photocurrent density of 0.79 mA·cm?2, attributed to increased light absorption, conductivity, and charge carrier concentration. This method offers a scalable approach for developing efficient plasmonic semiconductors for solar energy conversion.
研究不足
The study is limited by the potential for excessive W5+ to become recombination centers for photo-generated electrons and holes, which may decrease photocurrent density. The interface impedance plays a critical role in PEC performance, potentially more significant than charge carrier concentration.
1：Experimental Design and Method Selection:
The study employs an acid-induced-metal-reduction (AIMR) method to introduce oxygen vacancies into WO3 electrodes, enabling tunable LSPR.
2：Sample Selection and Data Sources:
WO3 electrodes are fabricated via a hydrothermal method and annealed. Various metal foils (Fe, Ni, Cu, Zn) are used for reduction in acid solution.
3：List of Experimental Equipment and Materials:
Fluorine-doped tin oxide (FTO) substrate, sodium tungstate dehydrate, ammonium oxalate, titanium butoxide, gold (III) chloride trihydrate, silver nitrate, iron trichloride hexahydrate, bismuth nitrate pentahydrate, vanadium (IV) oxy acetylacetonate, acetic acid, hydrochloric acid.
4：Experimental Procedures and Operational Workflow:
WO3 electrodes are reduced by metal foils in acid solution for varying times, characterized by XRD, SEM, UV–Vis, Raman, XPS, and tested for PEC performance.
5：Data Analysis Methods:
PEC performance is evaluated via LSV, chopped J–t curves, EIS, and Mott–Schottky plots. Charge carrier concentration and conductivity are analyzed to understand performance enhancements.
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