研究目的
Investigating the disequilibrium transfer of the electrolyte in vanadium redox flow batteries to optimize battery performance.
研究成果
The real-time refractive index detector provides high-resolution insights into the disequilibrium transfer of materials in vanadium flow batteries, revealing rapid imbalance at initial operation and differing behaviors of vanadium and sulfate during charge/discharge. This method is beneficial for understanding electrochemical processes and optimizing operational parameters.
研究不足
The study focuses on the positive electrolyte and requires conjunction with another method (redox titration) to obtain comprehensive electrolyte composition. The technique's applicability under different conditions and its quantitative accuracy need further exploration.
1：Experimental Design and Method Selection:
A homemade refractive index (RI) detector is employed to monitor the RI change in the positive electrolyte during the charge/discharge process. The RIs of the electrolyte samples with different total vanadium concentrations (Cv), total sulfate concentrations (Cs) and SOCs are detected for calibration.
2：Sample Selection and Data Sources:
Electrolyte samples containing
3：5 M VO2+ + 5 M total sulfate initially in a cycling VFB. List of Experimental Equipment and Materials:
Refractive index detector, vanadium redox flow battery, Nafion 115 membrane.
4：Experimental Procedures and Operational Workflow:
The RI changes of the cycling VFB are monitored during charge/discharge processes. Redox titration is employed to determine the concentration of Cv at the end of the charge/discharge process.
5：Data Analysis Methods:
The relationship between RI and the parameters Cv, Cs, and SOC is obtained by multiple regression.
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