研究目的
To synthesize high-crystalline tungsten trioxides (WO3) using concentrated solar energy and characterize their physicochemical and electrochemical properties.
研究成果
High-crystalline tungsten trioxides were successfully synthesized using concentrated solar energy, showing a mixture of monoclinic and triclinic phases. The electrochemical performance varied with synthesis conditions, showing capacitive behavior in acidic and neutral media and catalytic behavior in alkaline media. The presence of W5+ and oxygen vacancies influenced the electrochemical properties.
研究不足
The study focuses on the synthesis and characterization of WO3 using concentrated solar energy, but does not explore the scalability of the method or the long-term stability of the materials under operational conditions.
1：Experimental Design and Method Selection:
Tungsten trioxides were synthesized using concentrated solar energy at three different temperatures and two oxygen mole fractions. The samples were characterized by XRD, SEM, and XPS.
2：Sample Selection and Data Sources:
Metallic tungsten green bars were used as precursors. The synthesis conditions varied in temperature and oxygen mole fractions.
3：List of Experimental Equipment and Materials:
Solar reaction chamber, K-type thermocouples, DualTrans vacuum transducer, FE-SEM Hitachi S-5500, Rigaku Ultima IV XRD, PHI 5000 VersaProbe II XPS.
4：Experimental Procedures and Operational Workflow:
Tungsten bars were heated to desired temperatures under controlled oxygen mole fractions. The resulting WO3 powders were characterized and their electrochemical performance evaluated.
5：Data Analysis Methods:
XRD for crystalline structure, SEM for morphology, XPS for surface composition and oxidation states, CV for electrochemical performance.
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