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Electrode treated by persulfate and application thereof

A persulfate and electrode technology, which is applied in battery electrodes, circuits, fuel cells, etc., can solve the problems of high production cost, poor electrocatalytic activity, and many processes, and achieve prolonging service life, simple preparation method, and high comprehensive performance Effect

Pending Publication Date: 2021-06-11
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

Alkaline zinc-iron redox flow battery electrode materials in the prior art have problems such as many processes, high production costs, and poor electrocatalytic activity.

Method used

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  • Electrode treated by persulfate and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Cut out a carbon felt with a thickness of 6 mm and soak it in a 0.5 mol / L potassium persulfate aqueous solution at 80 ° C. After 12 hours, take out the electrode and wash it repeatedly with water, and dry it for later use.

[0023] The prepared electrode material is used as positive and negative electrodes, the bipolar plate is graphite plate, and the ion exchange membrane is Nafion membrane produced by DuPont Company, with an effective area of ​​48cm 2 , assembled alkaline zinc-iron flow battery with a current density of 80mA / cm 2 . Among them, the positive electrode electrolyte contains ferrocyanide ion (Fe(CN) 6 4- ) alkaline solution, wherein the concentration of ferrocyanide ion is 1mol L -1 , the concentration of hydroxide ions is 3mol / L; the negative electrode electrolyte is an alkaline solution containing zincate ions, and the concentration of zincate ions is 0.5mol L -1 , the concentration of hydroxide ions is 3mol / L; the coulombic efficiency (CE) of the as...

Embodiment 2

[0030] Embodiment 2 (soaking time is non-optimal condition)

[0031] Compared with Example 1, the soaking time was changed to 0.2h, and other conditions were unchanged. After testing, the coulombic efficiency of the battery is 94.7%, the voltage efficiency is 85.2%, and the energy efficiency is 80.7%. Battery life is 80 cycles.

[0032] Compared with Comparative Example 1, the coulombic efficiency, energy efficiency and cycle stability of the alkaline system zinc-iron flow battery of the electrode material soaked at a non-optimal time all have a certain improvement, but it is different from that of the present invention in Example 1. There is still a small gap compared to the preferred soaking time.

Embodiment 3

[0033] Embodiment 3 (solution concentration is non-preferred condition)

[0034] Compared with Example 1, the concentration of potassium persulfate was changed to 0.1mol / L, and other conditions were unchanged. After testing, the coulombic efficiency of the battery is 96.4%, the voltage efficiency is 87.0%, and the energy efficiency is 83.9%. Battery life is 80 cycles.

[0035] Compared with Comparative Example 1, the coulombic efficiency, energy efficiency and cycle stability of the alkaline system zinc-iron flow battery of the electrode material processed at the non-optimal solution concentration have been improved to a certain extent, but it is different from that of the present invention in Example 1. There is still a small gap compared with the preferred soaking time.

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Abstract

The invention discloses an electrode treated by persulfate and application of the electrode in a zinc-iron flow battery, an electrode material is soaked in an aqueous solution of persulfate for treatment, and compared with an original untreated electrode material, the electrode material has higher electrode activity, the conductivity of the battery can be effectively improved, and the cycle performance and the efficiency of the battery are improved; meanwhile, the charge-discharge capacity and the energy density of the battery are greatly improved.

Description

technical field [0001] The invention relates to a zinc-iron liquid flow battery with a positive electrode treated with persulfate. Background technique [0002] Liquid flow energy storage battery is a new electrochemical energy storage technology. Compared with other energy storage technologies, it has high energy conversion efficiency, flexible system design, large storage capacity, free location selection, deep discharge, safety and environmental protection, and maintenance. With the advantages of low cost, it can be widely used in wind energy, solar energy and other renewable energy generation and energy storage, emergency power system, backup power station and power system peak shaving and valley filling. Due to the advantages of high safety, good stability, long life (life > 15 years), and low cost, the alkaline system zinc-iron flow battery is considered to be a kind of flow energy storage battery with high development potential. [0003] At present, the main limit...

Claims

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Application Information

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IPC IPC(8): H01M4/96H01M8/18
CPCH01M4/96H01M8/188Y02E60/50
Inventor 段寅琦李先锋张华民袁治章
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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