Molybdenum dioxide combined electrode and preparation method and application thereof

A molybdenum dioxide and metal composite technology, applied in the field of electrochemistry, can solve problems such as large current performance to be improved, and achieve the effects of improving contact, improving utilization efficiency, and improving electronic conductivity

Active Publication Date: 2016-02-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A small amount of research on the preparation of molybdenum dioxide electrodes is mainly to prepare pure-phase molybdenum dioxide electrodes and use them to prepare symmetrical capacitors. Due to the limit

Method used

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  • Molybdenum dioxide combined electrode and preparation method and application thereof

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Embodiment 1

[0057] Na 2 MoO 4 .2H 2 O and C 6 h 5 COONa is dissolved in water to prepare a mixed solution, and the pH value of the solution is adjusted to 10 with sodium hydroxide, and then Na is added to the solution. 2 SnO 3 .3H 2 O, formulated to contain MoO 4 2- 0.2mol / L, C 6 h 5 COO - 0.05mol / L and SnO 3 2- 0.02mol / L electrodeposition solution.

[0058] Cut the 304 stainless steel foil into an area of ​​4×1cm 2 The stainless steel belt is used as a current collector, and the current collector is ultrasonically washed with 10v% sulfuric acid aqueous solution and acetone in sequence, and finally rinsed with water and dried. A titanium mesh electrode coated with ruthenium oxide on the surface of 4 × 4 cm is used as the anode, the above mixed solution is the electrodeposition solution, and the current collector after surface cleaning is the cathode (the working area is 1 × 1 cm 2 ) for constant current electrodeposition with a current density of 2mA / cm 2 , the electrodepo...

Embodiment 2

[0061] The operation process is the same as in Example 1, except that the molybdate concentration in the mixed solution used is 0.8mol / L, the stannate concentration is 0.016mol / L, and the sodium benzoate concentration is 0.2mol / L. The area is 4×1cm 2 Carbon paper is used as a current collector, and the current density of constant current electrodeposition is 20mA / cm 2 , the measured tin content in the composite deposition layer is 6.2%, and the specific capacitance of the electrode active material is 388F / g.

Embodiment 3

[0063] The operation process is the same as in Example 1, except that the concentration of molybdate in the mixed solution used is 0.4mol / L, the concentration of stannate is 0.02mol / L, trisodium citrate replaces sodium benzoate, and the concentration is 0.1mol / L. The area is 4×1cm 2 The nickel strip is used as a current collector, and the current density of constant current electrodeposition is 5mA / cm 2 , the measured tin content in the composite deposition layer is 8.6%, and the specific capacitance of the electrode active material is 341F / g.

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Abstract

The invention relates to a molybdenum dioxide combined electrode and a preparation method and applications thereof, and belongs to the technical field of electrochemistry. The method comprises the steps: preparing a mixed alkaline solution containing soluble molybdate and other types of metallic oxysalt; and forming a composite sedimentary deposit containing molybdenum dioxide and metal on the surface of a current collector of an electrode through electrochemical codeposition. In this way, a molybdenum dioxide combined electrode for a supercapacitor is obtained. The molybdenum dioxide combined electrode for a supercapacitor is obtained through electrochemical codeposition, one kind of metal is evenly distributed inside a molybdenum dioxide sedimentary deposit, the selected metal can exist stably without electrochemical corrosion within the working electromotive force range of molybdenum dioxide, and the metal exhibits high hydrogen over-electromotive force without affecting the charge and discharge efficiency of molybdenum dioxide. Therefore, the electronic conductivity and the electrochemical performance of the prepared electrode can be improved, and the electrode with the high specific capacitance characteristic can be obtained. The combined electrode is reasonable in structural design, is simple to prepare, can be prepared on a large scale, and can be applied to supercapacitors on a large scale.

Description

technical field [0001] The invention relates to a molybdenum dioxide metal composite electrode and its preparation method and application; it belongs to the technical field of electrochemistry. technical background [0002] As an energy storage device, supercapacitor has the characteristics of high specific power and long cycle life, and is expected to be used as a key component of portable and power energy storage systems. Compared with traditional electrostatic capacitors such as aluminum electrolytic capacitors, supercapacitors have higher specific capacitance, and the energy density that can be stored is more than 10 times that of traditional electrostatic capacitors; compared with batteries, supercapacitors have greater power density and higher discharge efficiency. Due to the above advantages, the development of supercapacitor technology has been widely valued by academia, industry and military departments, and it is gradually used in the backup power supply of electr...

Claims

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Application Information

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IPC IPC(8): H01G11/46H01G11/86H01G11/30
CPCY02E60/13H01G11/46H01G11/30H01G11/86
Inventor 陈亚孔令坤胡方园刘宇石西昌杨喜云徐徽
Owner CENT SOUTH UNIV
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