Method for online detection of concentration of electrolyte of vanadium battery

A technology of electrolyte concentration and vanadium battery, which is applied in the direction of measuring device, color/spectral characteristic measurement, material analysis by optical means, etc.

Inactive Publication Date: 2012-08-01
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no relevant report on the mixed system electrolyte of V(IV) / V(III) and V(III) / V(II) of vanadium batteries simultaneously qualitatively and quantitatively determined by ultraviolet spectrophotometry.

Method used

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  • Method for online detection of concentration of electrolyte of vanadium battery
  • Method for online detection of concentration of electrolyte of vanadium battery
  • Method for online detection of concentration of electrolyte of vanadium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0125] Take random samples, dilute 100 times, test the absorbance of the sample, and draw its ultraviolet-visible spectrum curve, compare the sample spectrum curve with the standard spectrum curve of monovalent state and mixed state vanadium ion, according to the two The shape of the curve and the position of the absorption peak determine that the sample is a trivalent vanadium ion solution, and the ultraviolet absorbance A at 401nm is taken u 401.0nm =0.409, into the curve equation of the absorbance and concentration of the trivalent vanadium ion solution deduced by the present invention, the concentration C of the trivalent vanadium ion can be obtained (III) =0.08563A u 401.0nm +5.21×10 -5 =0.03507(mol / L), or take the UV absorbance A at 606.5nm u 606.5nm =0.25199, substituting in the curve equation of the absorbance and concentration of the trivalent vanadium ion solution deduced by the present invention, obtains the concentration C of trivalent vanadium ion (III) =0.1...

Embodiment 2

[0127] Take random samples, dilute 100 times, test the absorbance of the sample, and draw its ultraviolet-visible spectrum curve, compare the sample spectrum curve with the standard spectrum curve of monovalent state and mixed state vanadium ion, according to the two The shape of the curve and the position of the absorption peak determine that the sample is a divalent vanadium ion solution, and the ultraviolet absorbance A at 572.5nm is taken u 572.5nm =0.5025, into the curve equation of the absorbance and concentration of the divalent vanadium ion solution deduced by the present invention, the concentration C of the divalent vanadium ion can be obtained (II) =0.2267A u 572.5nm -2.37×10 -3 =0.1115 (mol / L), the obtained experimental result is compared with the concentration 0.113mol / L measured by titration, and the error is within 5%, see Table 1.

Embodiment 3

[0129] Take random samples, dilute 100 times, test the absorbance of the sample, and draw its ultraviolet-visible spectrum curve, compare the sample spectrum curve with the standard spectrum curve of monovalent state and mixed state vanadium ion, according to the two The shape of the curve and the position of the absorption peak determine that the sample is a tetravalent vanadium ion solution, and the ultraviolet absorbance A at 770nm is taken u 770nm =0.73211, substituting in the curve equation of the absorbance and concentration of the tetravalent vanadium ion solution deduced by the present invention, can obtain the concentration C of tetravalent vanadium ion (IV) =0.0546A u 770nm -1.38×10 -4 =0.0389 (mol / L), the obtained experimental result is compared with the concentration 0.04mol / L measured by titration, and the error is within 5%, see Table 1.

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Abstract

The invention relates to a method for online detection of the concentration of electrolyte of an all vanadium redox flow battery. A divalent vanadium V (II) system, a trivalent vanadium V (III) system and a tetravalent vanadium V (IV) system are analyzed by the aid of ultraviolet and visible spectrophotometry, a divalent vanadium V (II) and trivalent vanadium V (III) mixed system and a trivalent vanadium V (III) and tetravalent vanadium V (IV) mixed system are analyzed by the aid of a K matrix method, and a curve equation of the concentration of the vanadium with various valence states and absorbance in the systems is deduced. The concentration of vanadium ions with various valence states in a test sample can be rapidly detected only by substituting absorbance data of the test sample with unknown concentration in the electrolyte of the vanadium battery into the absorbance-concentration curve equation measured and deduced by the method, and accuracy of the method is proved as compared with a national standard method. The method has a huge application prospect in terms of dynamically monitoring valence changes of the electrolyte of the vanadium ions and simultaneously, qualitatively and quantitatively checking the vanadium electrolyte with mixed valence states.

Description

Technical field: [0001] The invention relates to a method for online detection of the electrolyte concentration of a vanadium battery, in particular to a method for studying the divalent vanadium ion V(II) system and the trivalent vanadium ion V(III) system in a monovalent state by using ultraviolet-visible spectrophotometry. System and tetravalent vanadium ion V(IV) system, and qualitative and quantitative analysis of mixed valence state of divalent vanadium and trivalent vanadium ion V(II) / V(III) mixed solution system and trivalent vanadium and tetravalent vanadium ion A method for quickly analyzing and detecting the electrolyte concentration of a vanadium battery on-line at the same time as the V(III) / V(IV) mixed solution system. Background technique: [0002] As people pay more and more attention to environmental issues such as air pollution caused by burning coal and oil, and the global energy crisis, the research and utilization of renewable energy has always become th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/33G01N21/35G01N21/3577
Inventor 吴雄伟刘素琴刘灿明高潮李晓刚王辉宪李辉勇钟美娥夏宇飞刘锦伟
Owner HUNAN AGRICULTURAL UNIV
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