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Electrochemically modified graphite electrode

A graphite electrode and electrochemical technology, applied in the field of applied electrochemistry, can solve the problems of long electrochemical activation time, high price of glassy carbon electrodes, and low quasi-capacitance, and achieve simple manufacturing, high stability, high energy and Effect

Inactive Publication Date: 2010-04-21
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Sullivan et al. (J.Electrochem.Soc.147(2000)2636) reported that the glassy carbon electrode has quasi-capacitive properties after electrochemical modification, and can be used as an electrode material for electrochemical capacitors, but it has low quasi-capacitance and is used The glassy carbon electrode has disadvantages such as high price and long electrochemical activation time.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0026] This electrode uses the artificial graphite plate as the graphite body 1, and a part of its end face (1cm 2 ) exposed to 2M H 2 SO 4 In the aqueous solution, it is cycled between electrochemical oxidation and electrochemical reduction by constant current pulse: first, the constant anode current density is 260mA / cm 2 , anodized for 200s; then the constant cathode current density was -220mA / cm 2 , cathode reduction treatment for 120s; repeat the above treatment process 6 times, and finally undergo mechanical cold pressing to obtain an active layer 2 with a thickness of 40 microns. Through this electrochemical modification treatment, its SEM picture is as follows figure 2 shown. From figure 2 It can be seen that the active layer 2 is composed of many microchip-like structures, and is rough and porous. The element composition of the graphite body 1 and the surface of the active layer 2 was further analyzed by XPS, and the results were as follows image 3 shown. Fr...

Embodiment 2

[0029] The electrode is a graphite body 1 with a cylinder made of natural graphite, and its surface area is 10 cm 2 , exposing the whole to 1M HClO 4 In aqueous solution, the cycle treatment between electrochemical oxidation and electrochemical reduction is carried out by constant potential pulse: first, the constant anode potential is 2.5V vs.SCE , anodized for 500s; after that, the cathode potential was kept constant at 0.2V vs.SCE , 400s at the cathode reduction position; finally, the above-mentioned treatment process was repeated 8 times, and an active layer 2 with a thickness of 180 microns was obtained. The microstructural features of the active layer 2 are very similar to those in Example 1, and will not be repeated here. The above electrochemically modified graphite electrode was placed in 2.3M H 2 SO 4 In aqueous solution, the standard three-electrode system was used to evaluate the electrochemical capacitance characteristics. The capacitance at 2mA charge and di...

Embodiment 3

[0031] This electrode uses artificial graphite net as graphite body 1, and its surface area is 3cm 2 , expose it to 3M NaOH aqueous solution as a whole, and perform cycle treatment between electrochemical oxidation and electrochemical reduction by constant potential pulse: first, the constant anode potential is 1.0V vs.SCE , anodized for 1000s; after that, the cathode potential was kept constant at -1.0V vs.SCE , and the cathode was reduced for 300s; finally, the above-mentioned treatment process was repeated 10 times, and an active layer 2 with a thickness of 100 microns was obtained. The microstructural features of the active layer 2 are very similar to those in Example 1, and will not be repeated here. The above electrochemically modified graphite electrode was placed in 2.3M H 2 SO 4 In aqueous solution, the standard three-electrode system was used to evaluate the electrochemical capacitance characteristics. The capacitance at 2mA charge and discharge current is 3.8Fcm...

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Abstract

The invention discloses an electrochemically modified graphite electrode, which consists of a graphite body and an active layer, wherein the active layer is attached to the surface of the graphite body. The electrochemically modified graphite electrode is characterized in that: the active layer (2) is a product directly obtained in a way that the graphite body (1) is subjected to circular treatment between electrochemical oxidation and electrochemical reduction in water-based electrolyte solution with ionic conductivity. The electrochemically modified graphite electrode is used as an electrode material of an electrochemical capacitor, has high energy, high power density and high-speed charge and discharge performances, also has the advantages of high electric conductivity, low material cost, high stability, long service life, simple manufacture, low production cost and the like. In addition, the electrochemically modified graphite electrode of the invention can be widely applied to applicable electrochemical engineering and serves as the electrode material.

Description

technical field [0001] The invention relates to an electrochemically modified graphite electrode, which belongs to the technical field of applied electrochemistry. Background technique [0002] Applied electrochemistry is the application of relevant electrochemical principles to fields related to the actual production process. Its tasks are diverse, among which the most important are: development and utilization of electrochemical new energy systems, metal surface finishing, electrochemistry Chemical corrosion and protection, development of electrochemical sensors, electrolytic synthesis of inorganic and organic compounds, etc. The applied electrochemical industry is inseparable from electrodes, and the selection of electrode materials is extremely important. The direction and kinetics of the electrode process, the structure type of the electrode and the electrolytic cell and the life of the cell, the maintenance cost and labor consumption, and the dynamic index of the proc...

Claims

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Application Information

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IPC IPC(8): H01G9/058H01G11/34
Inventor 徐海波芦永红范新庄
Owner OCEAN UNIV OF CHINA
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