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Multifunctional negative material and application thereof in all-vanadium redox flow battery

An all-vanadium redox flow battery and negative electrode material technology, which is applied in the direction of regenerative fuel cells, battery electrodes, circuits, etc., can solve the problems of being unsuitable for large-scale applications, reducing hydrogen evolution, and high electrode costs, so as to improve electrocatalytic activity and electrochemical performance. Effects of reversibility, suppression of hydrogen evolution, and simple preparation method

Inactive Publication Date: 2016-02-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (2) Metallize electrode materials such as graphite felt, carbon paper, etc., that is, modify metal ions on the surface of carbon fibers, such as Sun et al. (Sun, B.T.; .) Modified Mn on the carbon fiber surface 2+ 、 Te 4+ 、In 3+ and Ir 3+ etc., found Ir 3+ It is most effective in improving the electrocatalytic activity of electrode materials, but due to the high cost of electrodes due to the use of noble metals, it is not suitable for large-scale applications
However, even if no overcharge occurs, the hydrogen evolution reaction will be accompanied by V 2+ / V 3+ The reactions are carried out simultaneously, so this method does not reduce hydrogen evolution

Method used

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  • Multifunctional negative material and application thereof in all-vanadium redox flow battery
  • Multifunctional negative material and application thereof in all-vanadium redox flow battery
  • Multifunctional negative material and application thereof in all-vanadium redox flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A certain size of graphite felt was impregnated in 0.02MPb(NO 3 ) 2 HNO 3 solution, after ultrasonic dispersion for 30 min, take it out, put it in a drying oven at 105 ° C for 10 h, and then put the loaded Pb(NO 3 ) 3 The graphite felt was heated to 600°C in a nitrogen atmosphere, and H 2 Constant temperature reaction 1h, Pb 2+ It was reduced to Pb, then cooled to room temperature under a nitrogen atmosphere, and weighed using an electronic balance to determine that the mass ratio of Pb loading was 2%.

[0040] In order to test the electrochemical activity of the vanadium ion redox couple on the surface of the Pb-modified graphite felt, a cyclic voltammetry test was carried out on the Pb-modified graphite felt prepared in Example 1. Pb-modified graphite felt was used as the working electrode, a non-porous graphite plate was used as the counter electrode, and a saturated calomel electrode was used as the reference electrode. The electrochemical testing instrument us...

Embodiment 2

[0045] Immerse a certain size of carbon felt in a 0.05M lead acetate aqueous solution, ultrasonically disperse it for 30 minutes, take it out, put it in a drying oven at 100°C and dry it for 10 hours, then raise the temperature of the carbon felt loaded with lead acetate to 600°C in a nitrogen atmosphere, pass Enter H 2 Constant temperature reaction 2h, Pb 2+ It was reduced to Pb, then cooled to room temperature under a nitrogen atmosphere, and weighed using an electronic balance to determine that the mass ratio of Pb loading was 5%. The negative electrode material not only has high electrocatalytic activity, can reduce the electrochemical polarization of the liquid flow energy storage battery, increase the working current density of the battery, but also improve the charge and discharge capacity of the battery.

[0046] The single cell assembly evaluation conditions are the same as in Example 1, and the difference from Example 1 is that the all-vanadium redox flow battery us...

Embodiment 3

[0048] A certain size of carbon paper was impregnated in 0.1MPb(NO 3 ) 2 HNO 3 solution, after ultrasonic dispersion for 30 min, take it out, put it in a drying oven at 105 ° C for 10 h, and then put the loaded Pb(NO 3 ) 2 The carbon paper was heated to 600°C in a nitrogen atmosphere, and H 2 Constant temperature reaction for 1h, so that Pb(NO 3 ) 2 It was decomposed and reduced to Pb, then cooled to room temperature, and weighed using an electronic balance to determine that the mass ratio of Pb loading was 10%. The negative electrode material not only has high electrocatalytic activity, can reduce the electrochemical polarization of the liquid flow energy storage battery, increase the working current density of the battery, but also improve the charge and discharge capacity of the battery.

[0049] The single cell assembly evaluation conditions are the same as in Example 1, and the difference from Example 1 is that the all-vanadium redox flow battery using Pb-modified c...

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Abstract

The invention discloses a multifunctional negative material. A carbon material is taken as a matrix; the surface of the material is modified by an electrocatalyst containing Pb; the electrocatalyst containing the Pb is one / two or more of a Pb simple substance, PbO<2> or lead sulfate; and the deposit rate of the electrocatalyst containing the Pb on the matrix is 0.05wt% to 80wt% of that of the multifunctional negative material. The electrode is applicable to a negative electrode of an all-vanadium redox flow battery; the electrocatalytic activity and the electrochemical reversibility of the electrode material on a V<2+> / V<3+> redox reaction can be improved; the charge transfer resistance is reduced; the multifunctional negative material has high hydrogen evolution over-potential; a hydrogen evolution reaction can be inhibited; the service lifetime of the battery is prolonged; and the charge and discharge capacity of the battery can also be improved. According to the multifunctional negative material, the voltage efficiency and the energy efficiency of the all-vanadium redox flow battery are improved, so that the working current density of the all-vanadium redox flow battery is improved; and the weight, the size and the cost of the battery with the same output power are greatly reduced.

Description

technical field [0001] The invention relates to the field of liquid flow energy storage batteries in chemical energy storage technology, in particular to electrodes of all-vanadium redox flow batteries. Background technique [0002] Due to its independent output power and capacity, the all-vanadium redox flow battery has flexible system design; high energy efficiency, long life, high operation stability and reliability, and low self-discharge; large degree of freedom in site selection, no pollution, and simple maintenance. With the advantages of low operating cost and high security, it has broad development prospects in large-scale energy storage. It is considered to be an effective method to solve the random and intermittent unsteady characteristics of renewable energy power generation systems such as solar energy and wind energy. There are significant demands in power generation and smart grid construction. [0003] At present, the main limitation restricting the commerci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/96H01M4/90H01M8/18
CPCY02E60/50
Inventor 刘涛张华民李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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