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A kind of transition metal hypervalent oxide electrode and its preparation method and application

A technology of high-valent oxides and transition metals, applied in the field of electrochemistry, can solve problems such as electrode structure damage, achieve the effect of improving the overall energy density and avoiding the release of toxic gases

Active Publication Date: 2017-12-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the main part of these active materials is still Ni(OH) 2 These low-priced hydroxides or oxides will dissolve in the neutral electrolyte, which will lead to the destruction of the electrode structure, so the supercapacitor electrode prepared by the above method can only be used with strong alkali Used together with electrolytic solution

Method used

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  • A kind of transition metal hypervalent oxide electrode and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0042] NiSO 4 ·6H 2 O and C 6 h 5 COONa is dissolved in water to prepare Ni 2+ 0.05mol / L, C 6 h 5 COO - 0.4mol / L mixed solution, adjust the pH value of the solution to 8 with sodium hydroxide and sulfuric acid; obtain the electrodeposition solution.

[0043] Cut the 304 stainless steel foil into an area of ​​4×1cm 2The stainless steel belt is used as a current collector, which is ultrasonically washed with acetone, rinsed with water and dried. A titanium mesh electrode coated with ruthenium oxide on the surface of 4 × 4 cm is used as the cathode, the above mixed solution is the electrodeposition solution, and the carbon cloth current collector after surface cleaning is used as the anode (the working area is 1 × 1 cm 2 ) for constant current electrodeposition with a current density of 1mA / cm 2 , and the electrodeposition time was 20 minutes to obtain an oxidized high-nickel deposition layer (with a thickness of 5 microns).

[0044] Use 1mol / L lithium sulfate aqueous s...

Embodiment 2

[0046] Operation process and other conditions are all consistent with embodiment 1; Different condition parameters are as follows:

[0047] Ni in electrodeposition solution 2+ The concentration is 1mol / L, the concentration of acetate is 0.6mol / L, the concentration of sodium benzoate is 0.4mol / L, and the pH value of the electrodeposition solution is 6;

[0048] The area is 4×1cm 2 Carbon paper is used as a current collector, and the current density of constant current electrodeposition is 10mA / cm 2 , the electrodeposition time was 8 minutes, and the measured specific capacitance of the electrode active material was 518.9 F / g.

Embodiment 3

[0050] Operation process and other conditions are all consistent with embodiment 1; Different condition parameters are as follows:

[0051] Just use cobalt sulfate instead of nickel sulfate, the concentration of divalent cobalt ions in the electrodeposition solution is 0.4mol / L, the concentration of acetate is 0.6mol / L, and the anode is within the potential range of 0.6V to 1.3V relative to the saturated calomel electrode The kinetic potential deposition was performed with a potential scanning speed of 10 mV / s. The measured specific capacitance of the electrode active material was 421.2 F / g.

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Abstract

The invention relates to a transition metal high-valent oxide electrode, a preparation method and application thereof, belonging to the technical field of electrochemistry. The transition metal high-valent oxide electrode includes a current collector and a coating layer uniformly coated on the current collector, and the coating layer is composed of high-valent oxides of transition metal elements. The preparation method is as follows: dissolving soluble transition metal salt and buffering agent in water to form a mixed solution, adjusting the pH value of the mixed solution to 6-8 to obtain an electrodeposition solution; then using the current collector material after surface cleaning as an anode, The anode is placed in the electrodeposition solution obtained in step 1 for oxidation electrochemical deposition, and a transition metal hypervalent oxide electrode is obtained on the anode. Including the electrochemical element; the electrochemical element contains the transition metal high-valence oxide electrode. The invention has reasonable component design, simple preparation process, excellent performance of the obtained product, and is convenient for large-scale industrial application.

Description

technical field [0001] The invention relates to a transition metal high-valent oxide electrode, a preparation method and application thereof, belonging to the technical field of electrochemistry. Background technique [0002] Supercapacitors have been widely valued for their high-power performance and long cycle life. The main problem faced by supercapacitors is their relatively low energy density compared to batteries. In order to improve the performance of supercapacitors, that is, to increase the specific energy while maintaining their advantages such as high specific power, extensive research has been carried out around various transition metal oxide electrodes with faradaic pseudocapacitive behavior. Although RuO 2 High-power charging and discharging is very good, but its resources are scarce, the price is high, and it is difficult to obtain commercial promotion in the civilian industry. In order to seek cheap supercapacitor electrode materials, around NiO, Co 3 o ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/26H01G11/30H01G11/86
CPCY02E60/13
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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