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Ferric oxide@titania nanorod array electrode on titanium substrate and its preparation method

A technology of ferric tetroxide and nanorod arrays, applied in nanotechnology, battery electrodes, nanotechnology and other directions, can solve the problems of inability to significantly improve cycle performance, unsuitable array morphology, poor cycle stability, etc. Effects of transport, suppression of side reactions, and improvement of electrochemical performance

Active Publication Date: 2019-05-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the continuous phase transition during the redox energy storage process will cause structural damage, resulting in extremely poor cycle stability in aqueous electrolytes.
The existing technology is mainly aimed at ferroferric oxide powder materials, involving strategies such as compounding with graphene to improve cycle stability. These strategies are effective but not suitable for array morphology
However, the proposed measures such as carbon coating suitable for the array morphology cannot significantly improve the cycle performance.

Method used

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  • Ferric oxide@titania nanorod array electrode on titanium substrate and its preparation method
  • Ferric oxide@titania nanorod array electrode on titanium substrate and its preparation method
  • Ferric oxide@titania nanorod array electrode on titanium substrate and its preparation method

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Embodiment 1

[0032] A ferric oxide nanorod array electrode on a titanium substrate, the preparation method of which comprises: adding 0.946 grams of ferric chloride (FeCl 3 ·6H 2 O) and 0.497 grams of sodium sulfate (Na 2 SO 4 ) was dissolved in 70 milliliters of deionized water, stirred with a magnetic stirrer to make it fully dissolved, and mixed uniformly to obtain a mixed solution; the titanium sheet and the prepared mixed solution were placed together under a high-pressure polytetrafluoroethylene liner substrate and transferred to an oven for hydrothermal reaction at 160°C for 6 hours; after natural cooling, the titanium sheets with nanorod arrays were taken out, washed and dried with deionized water; Heating to 600° C. and annealing for 2 hours, taking out after cooling, and obtaining an array sample of ferric oxide nanorods on a titanium substrate. The sample was observed by scanning electron microscope and X-ray diffraction, the results are shown in figure 1 , figure 1 The res...

Embodiment 2

[0035] A composite nanorod array electrode of ferric oxide@titanium dioxide on a titanium substrate, the preparation method of which comprises: using titanium tetrachloride and water as the titanium source and oxygen source respectively for the sample in Example 1, and depositing it by atomic layer deposition technology Titanium oxide: Titanium tetrachloride and water are used as the titanium source and oxygen source respectively. Firstly, the titanium source enters the chamber for 0.2s. After reaching saturated adsorption, the excess titanium source is pumped away and flushed with nitrogen for 20 seconds. Finally, let the oxygen source enter the chamber for 0.2s. After reaching saturated adsorption, the excess oxygen source is pumped away. After flushing with nitrogen for 20 seconds, this is a deposition cycle. According to this, the titanium source and the oxygen source are sequentially pulsed. Alternately feeding into the reactor cavity is a deposition cycle, and the number of...

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Abstract

The invention relates to a ferroferric oxide@titanium dioxide nanorod array electrode on a titanium substrate and a preparation method of the ferroferric oxide@titanium dioxide nanorod array electrode. The ferroferric oxide@titanium dioxide nanorod array electrode on the titanium substrate is characterized by comprising a titanium metal substrate and a ferroferric oxide@titanium dioxide composite nanorod array growing on the titanium metal substrate; the diameter of a single composite nanorod is 85-115nm and the composite nanorods are vertically, uniformly and densely distributed on the surface of the titanium metal substrate and are in an array form; and titanium dioxide coats the outer surface of ferroferric oxide. According to a titanium dioxide protection layer of the ferroferric oxide@titanium dioxide nanorod array electrode on the titanium substrate, the cycle performance of the electrode can be greatly improved, the side reaction of water electrolysis in an electrolyte is effectively suppressed, the capacity of the electrode is improved, the electrochemical properties are greatly improved, and particularly, the cycle performance is outstanding; and the ferroferric oxide@titanium dioxide nanorod array electrode can be used as a negative electrode material for a water-based hybrid super-capacitor (or other hybrid electrochemical energy storage devices).

Description

technical field [0001] The invention belongs to the field of preparation of inorganic materials, in particular to a triiron tetroxide@titanium dioxide nanorod array electrode on a titanium substrate and a preparation method thereof, and belongs to the fields of electrochemistry, materials science, energy and the like. Background technique [0002] Compared with organic electrolyte lithium-ion batteries, aqueous lithium-ion batteries have the advantages of low cost, high safety, and high power density. As typical energy storage materials, transition metal oxides have a high theoretical specific capacity. As a common oxide, ferroferric oxide has the advantages of low cost, good electrical conductivity and environmental friendliness. The study found that ferroferric oxide can obtain a high specific capacity through the complete redox reaction of the iron valence state, such as further combining the kinetic advantages of the array structure electrode (especially the robust comb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525H01G11/46H01G11/86B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01G11/46H01G11/86H01M4/366H01M4/52H01M4/628H01M10/0525Y02E60/10Y02E60/13
Inventor 刘金平李睿智
Owner WUHAN UNIV OF TECH
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