MnO2-PPy/H-TiO2 ternary core-shell hybrid array electrode material and preparation method thereof

An array electrode, hybrid technology, used in hybrid/electric double layer capacitor manufacturing, hybrid capacitor electrodes, nanotechnology for materials and surface science, etc., can solve difficult to meet the requirements of high energy/power density, metal oxidation Large internal resistance, affecting electrochemical stability and other problems, to achieve the effect of improving electrical conductivity and electrochemical activity, environmental friendliness, and low cost

Active Publication Date: 2018-08-28
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are three main types of electrode materials for supercapacitors, namely carbon materials, metal oxides, conductive polymers, etc. Among them, carbon materials are the most extensively researched and applied, but the electric double layer charge energy storage method of carbon materials determines to a certain extent its The specific capacitance is low, and it is difficult to meet the requirements of high energy/power density; the faradaic pseudocapacitance generated by metal oxide and conductive polymer electrode materials through the

Method used

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  • MnO2-PPy/H-TiO2 ternary core-shell hybrid array electrode material and preparation method thereof
  • MnO2-PPy/H-TiO2 ternary core-shell hybrid array electrode material and preparation method thereof
  • MnO2-PPy/H-TiO2 ternary core-shell hybrid array electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] Controlled preparation of ordered TiO by electrochemical anodic oxidation 2 Nanotube array matrix, further annealed and crystallized TiO 2 Nanotube arrays for electrochemical hydrogenation reduction and light-assisted electrochemical deposition of conductive polymer PPy, chemical bath immersion deposition of high specific capacitance MnO 2 The dual functional modification of , thus obtaining a new type of high-performance MnO for supercapacitors 2 -PPy / H-TiO 2 Ternary core-shell hybrid array electrode materials. Concrete preparation method steps are as follows:

[0029] 1. First, ultrasonically clean a metal Ti sheet of a certain size in acetone and absolute ethanol for 15 minutes, and then wash it with deionized water and dry it for use.

[0030] 2. Prepare NH 4 F concentration is 0.25mol L -1 、H 2 O volume ratio of 8% NH 4 F-Water-ethylene glycol solution is used as the electrolyte, the cleaned Ti sheet is used as the anode, and the graphite sheet is used as t...

Embodiment 2

[0044] The preparation method of this embodiment is the same as that of Example 1, except that step 4 is skipped, that is, in step 5, the ordered TiO 2 The nanotube array is used as the working electrode, and other conditions remain unchanged, the MnO 2 -PPy / TiO 2 Ternary core-shell hybrid array electrode materials. With the MnO prepared in Example 1 2 -PPy / H-TiO 2 Ternary core-shell hybrid array electrode materials compared with TiO 2 The supercapacitive properties of the array electrode material prepared by using the nanotube array as the matrix decreased, and the current density was 1A·g -1 The specific capacitance is reduced to 506.2F·g -1 , good cycle life.

Embodiment 3

[0046] The preparation method of this example is the same as that of Example 1, the difference is that the light source is removed in step 5, and other conditions remain unchanged, and the MnO 2 -PPy / H-TiO 2 (dark) ternary core-shell hybrid array electrode material and the MnO prepared in Example 1 2 -PPy / H-TiO 2 Compared with the ternary core-shell hybrid array electrode materials, the supercapacitive properties of the array electrode materials prepared under the condition of no light decreased, and at a current density of 1A g -1 The specific capacitance is reduced to 426.5F·g -1 , good cycle life.

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Abstract

The invention provides an MnO2-PPy/H-TiO2 ternary core-shell hybrid array electrode material and a preparation method thereof and belongs to the technical field of nano functional material and energystorage and conversion. The preparation method comprises the following steps: preparing an ordered TiO2 nano tube array by adopting an anodic oxidation process, and performing crystallization annealing treatment and electrochemical hydrogenation reduction on the ordered TiO2 nano tube array to obtain an H-TiO2 nano tube array; then, depositing conductive polymer PPy thin layers with high specificcapacitance on the inner and outer surfaces of the H-TiO2 nano tube array; and finally, depositing nano MnO2 with high specific capacitance on the inner and outer surfaces of the PPy/H-TiO2 nano tubeto prepare the MnO2-PPy/H-TiO2 ternary core-shell hybrid array electrode material. When the current density is 1A.g<-1>, the specific capacitance can reach 563.6F.g<-1>; and when the current density is 10A.g<-1>, the specific capacitance is only lowered by 9.6% after charging and discharging for 5000 cycles.

Description

technical field [0001] The invention relates to the technical field of nano functional materials, energy storage and conversion, in particular to a kind of MnO 2 -PPy / H-TiO 2 A ternary core-shell hybrid array electrode material and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of high-efficiency energy storage device, which has the advantages of fast charge and discharge, long cycle life, high power density and good ultra-low temperature characteristics. It has broad application prospects and Development potential. Supercapacitors are mainly composed of electrode materials, electrolytes, diaphragms, and end plates, among which electrode materials are the key to determining their supercapacitive characteristics. [0003] Electrode materials for supercapacitors not only require high specific capacity and specific power, but also low internal resistance to meet the requirements of high current and fast charge and discharge. At the ...

Claims

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Application Information

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IPC IPC(8): H01G11/26H01G11/46H01G11/86B82Y30/00
CPCB82Y30/00H01G11/26H01G11/46H01G11/86Y02E60/13
Inventor 刘家琴吴健许俊李靖巍张琪胡颖张勇吴玉程
Owner HEFEI UNIV OF TECH
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