Method for determining total iron concentration in Fe/Cr flow battery electrolyte
A measurement method, the technology of flow battery, applied in the direction of material electrochemical variables, etc., can solve the problems of inability to accurately measure the total iron concentration of Fe/Cr flow battery electrolyte, affecting redox titration, and mutual interference cannot be accurately measured , to achieve accurate and reliable analysis results
Inactive Publication Date: 2016-07-20
SUZHOU JIURUN ENERGY TECH
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Problems solved by technology
[0005] In the prior art, the national standards GB / T6730.65-2009, GB / T223.73-2008, and GB6730.8-86 all realize the determination of iron content. The principle is to reduce iron in different valence states in raw materials to ferrous iron , and then use the potassium dichromate method for oxidation-reduction titration; where the conventional spectrophotometer method is used to directly analyze the Fe 3+ However, as mentioned above, due to the mutual interference of various ion colors in the electrolyte, it cannot be accurately measured
[0006] Due to the presence of chromium ions in the Fe / Cr flow battery electrolyte, the final redox titration using potassium dichromate is seriously affected; and the colors of the ions present in the electrolyte affect each other, resulting in The accurate determination of the total iron concentration in the electrolyte of Fe / Cr flow battery cannot be completed by using the existing technology; therefore, in the practical application of Fe / Cr flow battery, an effective detection method is needed for accurately Detected the total iron concentration in the Fe / Cr flow battery electrolyte and further deduced Fe 3+ Concentration, so as to finally judge the pros and cons of battery performance
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0058] The total iron concentration and Fe in the Fe / Cr flow battery electrolyte 3+ The concentration was determined:
[0059] (1) Prepare the electrolyte sample to be tested, and divide it into parts A and B in equal amounts; pipette 10-20mL of part A sample into a 200mL volumetric flask (the dilution factor used is 10), dilute with water, Make to volume, mix well and set aside.
[0060] (2) Pipette 5-15mL of the A sample obtained after the treatment in step (1) into the Erlenmeyer flask, add a few glass beads, and add 2-10mL of perchloric acid (containing HClO 4 70-72%), heat the mixed solution in the conical flask, after the mixed solution stops smoking, cool to room temperature, add 2-10mL concentrated nitric acid, then add water to dilute to 100mL, heat to boil to dissolve the Salts formed by ions and added perchloric acid and concentrated nitric acid;
[0061] (3) Add a part of concentrated ammonia water to the mixed solution obtained after the treatment in step (2) u...
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Abstract
The invention provides a method for determining total iron concentration in Fe / Cr flow battery electrolyte. Firstly, the influence of chromium ions on redox titration is eliminated through pretreatment, then all iron is converted into F2<2+>, titration is performed by using K2Cr2O7 standard solution, and determination of total concentration in electrolyte is completed according to a reaction quantitative relationship of Fe<2+> and K2Cr2O7 and blank experiment data; in addition, concentration of Fe<3+> can be further calculated according to the determined total iron concentration. The method avoids the influence of the chromium ions on iron concentration titration testing; colorful ions in solution are enabled not to influence the determination of Fe<3+> concentration, no special instrument is needed, and the obtained analysis result is accurate and reliable and can be used for evaluating the performance of Fe / Cr flow batteries.
Description
technical field [0001] The invention relates to a detection method of total iron concentration, in particular to a detection method of total iron concentration in Fe / Cr flow battery electrolyte. Background technique [0002] Electrochemical flow battery (electrochemical flow cell), referred to as flow battery, generally also known as redox flow battery (flowredoxcell or redoxflowcell) is a new type of large-scale electrochemical energy storage device. As a kind of flow battery, Fe / Cr flow battery has the following excellent characteristics: high efficiency, low cost, long life, fast response, excellent high current and rapid discharge capability, wide adaptable temperature range, good safety , no pollutant emissions, the design scale can be large or small, can buffer and store the output of solar and wind energy, improve the output stability of solar and wind power, and be used in renewable energy such as wind and solar and power peak shaving, Large-scale energy storage sys...
Claims
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IPC IPC(8): G01N27/42
CPCG01N27/42
Inventor马志啟张红敏白敬军
OwnerSUZHOU JIURUN ENERGY TECH