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Titanium oxide nanotube-based supercapacitor electrode and preparation method thereof

A technology of titanium oxide nanotubes and supercapacitors, which is applied in the field of electrochemistry, can solve the problems that the cycle stability cannot meet the application, and achieve the effects of improving stability, good application prospects, and improving cycle life

Active Publication Date: 2018-10-12
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such cycle stability cannot meet its application in the field of supercapacitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The size, pretreatment, anodic oxidation and annealing process of the Ti sheet are the same as those in Comparative Example 1.

[0023] The crystalline TiO2 electrode is electrochemically doped. The TiO2 electrode was used as the working electrode, the graphite rod was used as the counter electrode, the distance between the two electrodes was 2.5 cm, 2M potassium hydroxide solution was used as the electrolyte, the potential range of cyclic voltammetry was -1.6 V~0 V, and the sweep rate was 100 mV / s Doping is completed after 5 scans.

[0024] The electrolyte and preparation method of the supercapacitor are the same as in Comparative Example 1.

[0025] The prepared supercapacitor was subjected to a constant current charge and discharge test, and was charged and discharged at a constant current density of 0.5mA / cm2 within a voltage range of 0.9V for 10,000 cycles. The capacitance of the first lap is 7.37mF, the Coulombic efficiency is 99%, the capacitance of the 10000th...

Embodiment 2

[0027] The size, pretreatment, anodic oxidation and annealing process of the Ti sheet are the same as those in Comparative Example 1.

[0028] For crystalline TiO 2 The electrodes are electrochemically doped. TiO 2 The electrode is the working electrode, the graphite rod is the counter electrode, the distance between the two electrodes is 2.5 cm, 2M potassium hydroxide solution is the electrolyte, the potential range of cyclic voltammetry is -1.6 V~0 V, and the scanning speed is 100 mV / s for 5 Doping is done after the lap. Then in the mass fraction of 30% H 2 o 2 Soak in the solution for 0.5min, rinse with deionized water and dry.

[0029] The electrolyte and preparation method of the supercapacitor are the same as in Comparative Example 1.

[0030] The prepared supercapacitor was subjected to a constant current charge and discharge test at a voltage of 0.5mA / cm2 within a voltage range of 0.9V.2 The constant current charge and discharge of the current density is 10,000 c...

Embodiment 3

[0032] The size, pretreatment, anodic oxidation, annealing and electrochemical doping treatment process of the Ti sheet are the same as in Example 1, changing H 2 o 2 The mass fraction of the solution is 10%, and the soaking time is 2min. Preparation of supercapacitor and constant current charge and discharge test conditions are the same as in Example 1. The capacitance of the first lap is 7.72 mF, the Coulombic efficiency is 99%, the capacitance of the 10000th lap is 7.65mF, the Coulombic efficiency is 99%, and the capacitance retention rate is 99.1%.

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Abstract

The invention discloses a titanium oxide nanotube-based supercapacitor electrode and a preparation method thereof. At the room temperature, a TiO<2> nanotube prepared by positive electrode oxidizationor various appearance modified TiO<2> nanotubes are subjected to annealing treatment, and then electrochemical reduction doping is performed in a potassium hydroxide solution; next, the product is immersed in a H<2>O<2> water solution for a certain while; and finally, the immersed TiO<2> electrode is applied to preparation of a supercapacitor. By adoption of the method, special equipment is not needed; through electrochemical doping processing in an alkali solution, the conductivity and capacitance of the TiO<2> electrode are improved; through immersion processing of the H<2>O<2> water solution, a parts of crystals on the surface of crystalline state TiO<2> is converted into non-crystals; by virtue of the non-crystal-coated crystal structure, stability of doping state can be facilitated,thereby improving cycle stability of the TiO<2> electrode; by virtue of the electrochemical doping processing in the alkali solution and by combination of immersion of H<2>O<2> water solution, the cycle life of the titanium oxide nanotube-based supercapacitor electrode is highly prolonged, so that the supercapacitor electrode can be well applied to the field of electrochemical energy storage.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a supercapacitor electrode based on titanium oxide nanotubes which is simple, cheap and has a high cycle life and a preparation method thereof. Background technique [0002] Titanium oxide is an n-type wide band gap semiconductor material with a band gap of 3.0-3.2 eV and unique physical and chemical properties. Recently, with the continuous innovation and development of nanomaterial preparation technology, nanostructured titanium oxide has attracted widespread attention. Among them, titanium oxide nanotubes have a wide range of applications in dye-sensitized solar cells, photocatalysis, supercapacitors and other fields due to their larger specific surface area and specific surface energy, better adsorption capacity and unique electron transport pathways. prospect. Especially for the titanium oxide nanotubes prepared by the anodic oxidation method, because they are gener...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/46
CPCH01G11/46H01G11/86Y02E60/13
Inventor 宋子星陈莹崔惠敏朱绪飞卢思彤宋晔
Owner NANJING UNIV OF SCI & TECH
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