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Lead dioxide modified graphite felt electrode of all-vanadium redox flow battery and preparation method thereof

An all-vanadium redox flow battery, lead dioxide technology, applied in battery electrodes, circuits, electrical components and other directions, can solve the problems of difficult industrialized production, difficult to control oxidation reaction, dangerous process, etc., and achieve moderate and dispersed oxidation reaction. Strong ability and good deep plating ability

Inactive Publication Date: 2013-09-11
DALIAN JIAOTONG UNIVERSITY
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Problems solved by technology

In the research on improving the performance of graphite felt electrodes, the commonly used methods are heat treatment, concentrated sulfuric acid treatment, electrochemical oxidation, etc., but although the conventional heat treatment method is simple in process, it has small operating flexibility, large energy consumption, and difficult to control the oxidation reaction; concentrated sulfuric acid The process of treatment is dangerous, and industrial production is difficult; electrochemical oxidation consumes energy and time; even if the carbon felt treated by the above method, its catalytic effect on the vanadium redox reaction needs to be further improved

Method used

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  • Lead dioxide modified graphite felt electrode of all-vanadium redox flow battery and preparation method thereof
  • Lead dioxide modified graphite felt electrode of all-vanadium redox flow battery and preparation method thereof
  • Lead dioxide modified graphite felt electrode of all-vanadium redox flow battery and preparation method thereof

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Embodiment Construction

[0023] Below in conjunction with embodiment the present invention is described further.

[0024] Take a blank graphite felt with a thickness of 3 mm, and clean the blank graphite felt with deionized water for subsequent use;

[0025] Preparation of α-PbO 2 and β-PbO 2 Plating solution, in which α-PbO 2 The plating solution is: mix 160gPbO with 1L3.5mol / L NaOH solution and stir evenly; β-PbO 2 The plating solution is: 150g Pb(NO 3 ) 2 Solid, 3.5g concentrated HNO with a concentration of 65% to 68% 3 and 0.25g NaF solid dissolved in 1L deionized water;

[0026] α-PbO 2 The plating solution is placed in a water bath at 40°C, and the blank graphite felt is electroplated in the α-PbO2 plating solution for 15 minutes by pulse electroplating, the electroplating current density is 3mA / cm2, the blank graphite felt is used as the positive electrode, and the platinum sheet electrode is used as the negative electrode to charge 10s, static frequency electroplating for 5s, stirring ...

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Abstract

The invention provides a lead dioxide modified graphite felt electrode of an all-vanadium redox flow battery and a preparation method thereof. A lead dioxide coating is plated on the surface of the graphite felt electrode; and the lead dioxide coating comprises an alpha-PbO2 coating of the inner layer and a beta-PbO2 coating outside the alpha-PbO2 coating. The preparation method comprises the following steps of electroplating a blank graphite felt electrode in alpha-PbO2 and alpha-PbO2 plating baths in succession, wherein the current density for electroplating alpha-PbO2 is 3 mA / cm<2>, while the current density for electroplating beta-PbO2 is 30 mA / cm<2>, and the pulse frequency of electroplating is charging for 10 s and keeping static for 5 seconds. The lead dioxide modified graphite felt electrode of the all-vanadium redox flow battery has the following advantages that alpha-PbO2 is formed into an intermediate layer and beta-PbO2 is formed into an outer layer, so that the crystal granularity of the coatings is low, the dispersing power is strong and the covering power is good, and the PbO2 coating is compact and even and good in catalytic activity for electrochemical reaction of vanadium metal.

Description

technical field [0001] The invention belongs to the technical field of storage batteries, and in particular relates to an all-vanadium redox flow battery, in particular to an electrode of an all-vanadium redox flow battery. Background technique [0002] All-vanadium redox flow battery is a new type of liquid flow battery. Compared with traditional batteries, vanadium battery has the characteristics of low self-discharge efficiency, long service life, easy maintenance, no cross-contamination, and deep discharge. It can be widely used in regulation Peak power system, large-scale solar photoelectric conversion system, large-scale wind energy system, energy storage system in remote areas, uninterruptible power supply or emergency power supply system and electric vehicles and other systems. Although the research work on vanadium batteries has entered the practical stage, there are still many technical problems to be solved about vanadium batteries, such as how to obtain electroly...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M4/96C25D9/04C25D9/06
CPCY02E60/50
Inventor 徐洪峰吴晓欣卢璐赵红
Owner DALIAN JIAOTONG UNIVERSITY
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