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H2-metal redox couple flow battery

A flow battery, electric pair technology, applied in the direction of fuel cells, regenerative fuel cells, circuits, etc., to avoid cross pollution, solve high overpotential losses, and reduce pollution

Inactive Publication Date: 2014-01-22
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a flow battery in which hydrogen is used as the negative electrode active material, so as to overcome the deficiencies of the existing metal pair flow battery

Method used

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Experimental program
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Effect test

Embodiment 1

[0027] The battery positive electrode 4 is made of 3 mm thick polyacrylonitrile graphite felt, which is soaked in deionized water and dried. The negative electrode 5 is graphite paper loaded with Pt / C catalyst. All reagents were of analytical grade, and water was deionized water. The ion exchange membrane is Nafion212 membrane. The electrode working area is 42cm 2 , the pump 1 is a magnetic circulation pump with a flow rate of 0.99 L / min, and the hydrogen flow rate of the negative electrode 5 is 500 ml / min. The working temperature and pressure are normal temperature and pressure. The charge-discharge polarization curve and charge-discharge cycle performance curve of the battery were tested by using the blue electric battery test system CT2001D3. Among them, the measurement of the discharge polarization curve of the battery is to discharge the configured electrolyte solution at different current densities for 2 minutes, and record the voltage value; 2 Discharge until the v...

Embodiment 2

[0029] It is basically the same as in Example 1, except that the positive electrode material of the battery is a 3mm thick polyacrylonitrile graphite felt heat-treated by a muffle furnace at a constant temperature of 400°C without air isolation for 30h. Others are all the same as in Example 1.

[0030] The charge-discharge polarization curve and charge-discharge cycle performance curve measured in embodiment 1 and embodiment 2 are as follows image 3 , Figure 4 .

[0031] When the graphite felt that has not been heat-treated at a constant temperature of 400°C in a muffle furnace without air isolation for 30 hours is used as the positive electrode of the battery, the Coulombic efficiency of the battery is 96.3%, the voltage efficiency is 76.3%, and the energy efficiency is 73.4%. When using electrodes, the coulombic efficiency of the battery is 97.8%, the voltage efficiency is 86%, and the energy efficiency is 84.2%.

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Abstract

An H2-metal redox couple flow battery comprises a positive electrode, a negative electrode, a proton exchange membrane, a positive electrode reaction active material and a negative electrode reaction active material. The positive electrode reaction active material is a metal ion solution, the negative electrode reaction active material is hydrogen, and a supported Pt / C catalyst is laid on the surface of the negative electrode. The H2-metal redox couple flow battery has the advantages that the positive electrode reaction active material is a metal salt solution prepared from a sulfuric acid solution of certain concentration, the negative electrode reaction active material is hydrogen, the positive electrode reaction active material and the negative electrode reaction active material have two forms of a liquid phase and a gas phase, and therefore cross contamination between ions of the positive electrode reaction active material and ions of the negative electrode reaction active material is avoided; the battery can be charged or discharged at the position close to a thermodynamic equilibrium potential, and the problem of high potential loss caused by irreversible electrodes of a traditional flow battery is solved; hydrogen is used as the negative electrode reaction active material, and therefore environment pollution can be reduced.

Description

technical field [0001] The invention belongs to the field of liquid flow batteries. Background technique [0002] Existing energy storage technologies are mainly divided into two parts: physical energy storage and chemical energy storage. Physical energy storage mainly includes pumping water energy storage, compressed air energy storage, etc. Chemical energy storage mainly refers to various batteries, fuel cells, flow batteries, etc. The existing redox flow battery (redox flow battery) uses the oxidized body and the reduced body of metal ions dissolved in the electrolyte as active materials for the positive and negative electrodes respectively. The positive and negative electrodes of the battery are separated by an ion exchange membrane, and the electrolyte solution The pump circulates between the electrolyte and the storage tank, and electrochemical reactions occur on the electrodes when flowing through the battery, thereby realizing the mutual conversion between electric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/182Y02E60/50
Inventor 卢璐许鹏程徐洪峰吴晓欣沈阳董一鸣刘宏文
Owner DALIAN JIAOTONG UNIVERSITY