Ultraviolet quantitative determination method for concentration of electrolyte of positive electrode of vanadium battery and application thereof

A cathode electrolyte, quantitative determination technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of cumbersome operation process and insufficient accuracy of vanadium ion concentration, and achieve the effect of simple operation process, accurate and reliable analysis results, and avoiding interference.

Active Publication Date: 2012-07-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for quantitatively measuring the concentration of a vanadium battery cathode electrolyte by ultraviolet

Method used

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  • Ultraviolet quantitative determination method for concentration of electrolyte of positive electrode of vanadium battery and application thereof
  • Ultraviolet quantitative determination method for concentration of electrolyte of positive electrode of vanadium battery and application thereof
  • Ultraviolet quantitative determination method for concentration of electrolyte of positive electrode of vanadium battery and application thereof

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Experimental program
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Embodiment 1

[0031] The ultraviolet quantitative determination method of the positive electrode electrolyte concentration of the vanadium battery of the present embodiment comprises the following steps:

[0032] 1. Determine the number of vanadyl sulfate crystal water by thermogravimetric method, and use it as V (IV) standard sample.

[0033] 2. In the wavelength range of 190nm to 900nm, scan the spectrum of the sulfuric acid solution, the concentration of the sulfuric acid solution is 1mol / L. It is determined that the sulfuric acid solution has no characteristic absorption peak in the wavelength range of 190nm to 900nm, which will not interfere with the determination of the absorbance of vanadium ions.

[0034] 3. The V(IV) standard sample is prepared into a V(IV) solution with a concentration of 0.02mol / L in an acidic solvent (acidic solvent is a sulfuric acid solution, and its concentration is 0.5mol / L), and the V(IV) solution is carried out full spectrum scan ( figure 1 ), determine ...

Embodiment 2

[0043] The ultraviolet quantitative determination method of the positive electrode electrolyte concentration of the vanadium battery of the present embodiment comprises the following steps:

[0044] 1. Determine the number of vanadyl sulfate crystal water by thermogravimetric method, and use it as V (IV) standard sample.

[0045] 2. In the wavelength range of 190nm to 900nm, scan the spectrum of the sulfuric acid solution, the concentration of the sulfuric acid solution is 0.5mol / L. It is determined that the sulfuric acid solution has no characteristic absorption peak in the wavelength range of 190nm to 900nm, which will not interfere with the determination of the absorbance of vanadium ions.

[0046] 3. The V(IV) standard sample is prepared into a V(IV) solution with a concentration of 0.03mol / L in an acidic solvent (acidic solvent is a sulfuric acid solution, and its concentration is 0.5mol / L), and the V(IV) solution is carried out The full-spectrum scan determined that the...

Embodiment 3

[0055] The ultraviolet quantitative determination method of the positive electrode electrolyte concentration of the vanadium battery of the present embodiment comprises the following steps:

[0056] 1. Determine the number of vanadyl sulfate crystal water by thermogravimetric method, and use it as V (IV) standard sample.

[0057] 2. In the wavelength range of 190nm to 900nm, scan the spectrum of the sulfuric acid solution, the concentration of the sulfuric acid solution is 0.2mol / L. It is determined that the sulfuric acid solution has no characteristic absorption peak in the wavelength range of 190nm to 900nm, which will not interfere with the determination of the absorbance of vanadium ions.

[0058] 3. The V(IV) standard sample is prepared into a V(IV) solution with a concentration of 0.05mol / L in an acidic solvent (acidic solvent is a sulfuric acid solution, and its concentration is 0.5mol / L), and the V(IV) solution is carried out The full-spectrum scan determined that the...

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Abstract

The invention relates to an ultraviolet quantitative determination method for concentration of electrolyte of a positive electrode of a vanadium battery and application thereof. The method comprises the following steps of: confirming characteristic absorption peak of acid solution of V (IV) vanadium compound and drawing a standard curve by performing full spectrum scanning on the acid solution ofthe V (IV) vanadium compound to determine concentration of V (IV) in the electrolyte of the positive electrode of the vanadium battery; then adding an excessive amount of reducer into the acid solution of the V (V) vanadium compound and performing full spectrum scanning on a reaction product to confirm the characteristic absorption peak of the acid solution of the V (IV) vanadium compound and draw a standard curve so as to determine total vanadium concentration in the electrolyte of the positive electrode of the vanadium battery; and deducting the concentration of the V (IV) to obtain the V (V) concentration, wherein the reducer can be used for reducing all V (V) into V (IV), but does not contain other valence states; and the remaining reducer can be used for completely complexing or not complexing a reduction product V (IV). The method has an accurate determination result and a simple and convenient operation process, and can be used for determining the concentration of the electrolyte of the positive electrode of the vanadium battery and performing laboratory and industrial analysis and quality control on related products containing V (V) or V (IV) vanadium ions.

Description

technical field [0001] The invention relates to the field of ultraviolet quantitative determination, in particular to an ultraviolet quantitative determination method for the concentration of a positive electrode electrolyte of a vanadium battery and an application thereof. Background technique [0002] The valence shell electronic structure of vanadium atom is 3d 3 4s 2 , can form V(V), V(IV), V(III), V(II) valence compounds, and is a typical variable valence element, which determines that the electrochemical behavior of vanadium is very active. And the potential difference between the V(V) / V(IV) pair and the V(III) / V(II) pair is 1.26V, and the all-vanadium redox battery (referred to as vanadium battery) was established and developed rapidly under this condition. [0003] The positive and negative electrode electrolytes of the vanadium battery are acidic solutions containing V(V) / V(IV), V(III) / V(II) vanadium compounds respectively, and the active substances are stored in ...

Claims

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Application Information

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IPC IPC(8): G01N21/33G01N21/31
Inventor 刘建国陈富于陈晖严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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