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A method for online determination of ion mobility in solution

An ionic and state-of-the-art technology, applied in collectors/separators, fuel cell parts, structural parts, etc., can solve problems such as inability to directly measure online, long time consumption, and complicated operation

Active Publication Date: 2020-06-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Method 2 uses ion mobility spectroscopy technology, which requires special equipment, complicated operation, long time-consuming and cannot be directly measured online

Method used

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  • A method for online determination of ion mobility in solution
  • A method for online determination of ion mobility in solution
  • A method for online determination of ion mobility in solution

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0062] (1) Construct redox couples. The ion to be measured is divalent vanadium ion (V 2+ ), it and trivalent vanadium ion (V 3+ ) to form a redox pair, constituting the negative electrode of the flow battery.

[0063] (2) Using ferric ions (Fe 3+ ) as the positive electrode of the flow battery.

[0064] (3) Divalent vanadium salt (vanadium dichloride) and ferric salt (ferric chloride) are respectively dissolved in 2mol / L dilute hydrochloric acid solution to form the positive and negative electrolytes of the flow battery, and stored in in the reservoir. Each with 200mL. The concentration of the former is 0.1mol / L, and the concentration of the latter is 0.3mol / L. Such a concentration configuration ensures that the limiting current during discharge of the flow battery is caused by the divalent vanadium ions to be measured.

[0065] (4) Pump the positive and negative electrolytes into the two electrode inlets of the flow battery with a peristaltic pump, and recover the ele...

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Abstract

The invention provides a method for on-line determination of the ionic mobility of a solution. The method comprises the following steps: firstly, constructing a redox couple; secondly, finding a matched redox couple matched with a to-be-determined redox couple in the first step; thirdly, using a redox flow battery, avoiding application of an external electric field, carrying out discharge test on the redox flow battery, and finding out limited current at the moment; fourthly, arranging a drift tube on the redox flow battery, connecting the drift tube with a direct current power supply, applying the external electric field, carrying out the discharge test and finding out limited current at the moment; fifthly, calculating the ionic mobility according to a formula. A pump, a dilute hydrochloric acid solution, a porous graphite electrode and an electrochemical test workstation required by the method provided by the invention are stocked materials and instruments in a common laboratory, and no special complex equipment is needed.

Description

technical field [0001] The invention relates to a method for measuring ion mobility in a solution. Background technique [0002] Ion mobility is the rate of ion migration under unit field strength, and is an important parameter in the electrolyte. Accurate and convenient acquisition of ion mobility is the premise and guarantee for analyzing the properties of the electrolyte and improving the performance of the electrochemical system. There are two main methods to measure ion mobility. One is to measure the intrinsic diffusion coefficient of ions by the static permeation method, and then divide the intrinsic diffusion coefficient D by RT (R is the universal gas constant, T is the temperature during the test, in K) to obtain. The second is measured by ion mobility mass spectrometry. The method only considers the intrinsic diffusion coefficient of ions, but ignores the size, shape and interaction between ions, and the measured results have a large deviation from the real val...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/023H01M8/0258H01M2/14G01N27/49
CPCG01N27/49H01M8/023H01M8/0258H01M50/40Y02E60/10Y02E60/50
Inventor 徐谦张飞虎苏华能秦立宇徐丽李华明
Owner JIANGSU UNIV