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Carbon electrode modified by cerium-zirconium oxide, preparation method and flow battery

A cerium zirconium oxide, flow battery technology, which is applied to batteries with bipolar electrodes, fuel cells, battery electrodes, etc. Low cost, good stability, easy to achieve the effect of large-scale production

Active Publication Date: 2014-12-10
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the current carbon braided electrodes for flow batteries have good conductivity, high stability, strong acid resistance, and good oxidation resistance, but poor wettability, low electrochemical activity, and cannot satisfy high-power (current) discharge, occurrence of To solve the problem of hydrogen evolution and oxygen evolution side reactions, provide a carbon electrode with high conductivity, high wettability, high electrochemical activity and high stability, its preparation method and a flow battery using the electrode material

Method used

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  • Carbon electrode modified by cerium-zirconium oxide, preparation method and flow battery
  • Carbon electrode modified by cerium-zirconium oxide, preparation method and flow battery
  • Carbon electrode modified by cerium-zirconium oxide, preparation method and flow battery

Examples

Experimental program
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Effect test

example 1

[0033] (1) 50.4mg cerous nitrate (Ce(NO 3 ) 3 ·6H 2O) Dissolve in 25mL of deionized water, and fully ultrasonically disperse at 25°C for 3min to make a homogeneous solution.

[0034] (2) Let the homogeneous solution prepared in step (1) stand for 5 minutes to remove air bubbles and impurities.

[0035] (3) Cut the pretreated polyacrylonitrile-based graphite felt into the required size, put it in the solution prepared in step (2) and disperse it ultrasonically for 5 minutes, slowly add 2.3mL of ammonia water dropwise under the condition of magnetic stirring, adjust pH=8, and let stand for 30min.

[0036] (4) Place the graphite felt prepared in step (3) in a blast drying oven at 70°C for 12 hours, cool to room temperature and then place it in a nitrogen atmosphere for calcination at 600°C for 2 hours. The prepared sample is recorded as 0.5% CeO 2 / GF. Of which 0.5% CeO 2 The meaning of / GF is as follows: the mass percentage of ceria-modified graphite felt is 0.5%. In the ...

example 2

[0038] Using 69.6mg of zirconium nitrate (Zr(NO 3 ) 4 ·5H 2 O) be dissolved in 25mL deionized water, preparation method is the same as example 1, makes 0.5%ZrO 2 / GF carbon electrode.

[0039] With the 0.5% ZrO 2 / GF carbon electrode assembly vanadium redox flow battery, other assembly conditions and test conditions are the same as Example 1. In the charge and discharge experiment, the battery charge and discharge current density is 100mA cm -2 , the energy efficiency of the battery is 76.9%; when the battery charge and discharge current density is 300mA cm -2 , the energy efficiency of the battery is 54.3%; when the battery charge and discharge current density is 500mA cm -2 , the energy efficiency of the battery is 40.1% (such as figure 1 shown). In the charge-discharge cycle life experiment, when the battery charge-discharge current density is 100mA cm -2 , after 1000 cycles of charging and discharging, the energy efficiency of the battery remains at about 76.8%, b...

example 3

[0041] Using 29.4mg of cerous nitrate (Ce(NO 3 ) 3 ·6H 2 O), 29.1mg of zirconium nitrate (Zr(NO 3 ) 4 ·5H 2 O) be dissolved in 25mL deionized water, preparation method is the same as example 1, makes 0.5%Ce 0.5 Zr 0.5 o 2 / GF carbon electrode.

[0042] With the 0.5% Ce 0.5 Zr 0.5 o 2 / GF carbon electrode assembly vanadium redox flow battery, other assembly conditions and test conditions are the same as Example 1. In the charge and discharge experiment, the battery charge and discharge current density is 100mA cm -2 , the energy efficiency of the battery is 78.9%; when the battery charge and discharge current density is 300mA cm -2 , the energy efficiency of the battery is 58.6%; when the battery charge and discharge current density is 500mA cm -2 , the energy efficiency of the battery is 40.8% (such as figure 1 shown). In the charge-discharge cycle life experiment, when the battery charge-discharge current density is 100mA cm -2 , after 1000 cycles of charging ...

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Abstract

The invention discloses a carbon electrode modified by cerium-zirconium oxide. The carbon electrode comprises a carbon braided electrode serving as a substrate and the cerium-zirconium oxide attached to the surface of the carbon braided electrode and used for modifying the carbon braided electrode. A flow battery comprises the carbon electrode modified by the cerium-zirconium oxide. A preparation method of the carbon electrode modified by the cerium-zirconium oxide comprises the following steps of attaching the cerium-zirconium oxide to the surface of the carbon braided electrode serving as the substrate, and modifying the carbon braided electrode. The carbon electrode provided by the invention has high conductivity, high wettability, high electrochemical activity and high stability, is applied to the flow battery, and can remarkably improve the performance of the flow battery, particularly high-power discharge performance and cycle life.

Description

technical field [0001] The invention relates to a flow battery, in particular to a carbon electrode modified by cerium-zirconium oxide, a preparation method of the electrode and a flow battery using the electrode. Background technique [0002] With the large-scale development and utilization of non-renewable energy such as coal, oil, and natural gas, and the increasingly serious environmental pollution, this puts forward new requirements for the optimization of energy structure and sustainable development. It is particularly important to develop an energy storage system with excellent performance to match renewable energy and ensure its stability and continuity. Flow battery (Flow battery), especially vanadium redox flow battery (VRFB or vanadium battery for short), has the advantages of easy scale, long cycle life, environmental friendliness, freedom of site selection, modular design and fast response. It has become one of the fastest-growing and most promising energy stor...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M10/18
CPCH01M4/8647H01M4/88H01M4/96H01M8/188Y02E60/50
Inventor 席靖宇周海鹏邱新平
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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