A kind of preparation method and application of doped polypyrrole/titanium dioxide nanotube composite material

Abstract

The invention discloses a preparation method and application of a polypyrrole / titanium dioxide-doped nanotube composite material. In the method, a TiO2 nanotube is taken as a working electrode, a platinum sheet is taken as a pair electrode, a saturated calomel electrode is taken as a reference electrode, an aqueous solution containing sodium p-tolue and pyrrole is taken as electrolyte, the pH value is adjusted to 1 to 2; a layer of polypyrrole film doped with the sodium p-tolue is deposited on the surface of a TiO2 nanotube electrode through an electropolymerization reaction, and the prepared composite material is applied to a sodium ion battery. The prepared doped polypyrrole is firmly combined with the TiO2 nanotube, and the hollow TiO2 nanotube has a large specific surface area, high mechanical strength and high structural stability, and has high stability after being doped with the polypyrrole; a sodium ion transport channel and space are provided; the hollow TiO2 nanotube and the polypyrrole are electrode active materials with energy storage activities, so that the synergetic additive effect between the two components in the composite material are brought into full play, and the charge / discharge specific capacity and cycle stability of the composite material are high; the method is simple and environment-friendly.

Description

technical field [0001] The invention relates to a preparation method and application of a doped polypyrrole / titanium dioxide nanotube composite material, belonging to the research field of new energy materials. Background technique [0002] At present, the application field and demand of lithium-ion batteries are constantly expanding and increasing. However, the lack of lithium resources on the earth and its high price have become bottleneck factors that limit the further development of lithium-ion batteries. Therefore, it is imminent to develop next-generation energy storage devices to replace lithium-ion batteries. Compared with lithium resources, sodium resources are abundant, widely distributed, cheap and easy to obtain, and environmentally friendly. Therefore, sodium-ion batteries are expected to become the preferred choice for the next generation of energy storage batteries. However, it cannot be ignored that, compared with lithium ions, the larger radius of sodium io...

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Problems solved by technology

However, it cannot be ignored that, compared with lithium ions, the larger radius of sodium ions leads to a much slower corresponding diffusion kinetic process, which has a greater negative impact on the charge / discharge performance of sodium ion batteries, and has a negative impact on electrode materials. Therefore, it is of great significance to carry out research on electrode materials and technologies compatible with sodium-ion batteries.

[0003] Three-dimensional ordered TiO 2 Nanotubes have many advantages such as non-toxicity, large specific surface area, stable structure, high degree of order, and sodium storage activity, and can be used as anode materials for sodium-ion batteries, but as semiconductor TiO 2 The relatively low conductivity of nanotubes limits the full play of their advantages, and the rigid lattice of inorganic materials will inhibit the diffusion and reversible de / intercalation process of larger sodium ions

[0004] At present, about polypyrrole and TiO 2 The compounding of the compound mostly adopts the chemical synthesis method, and its shape is nano-sphere particles. The preparation process of this method is complex and cumbersome, the reaction time is long, and it is accompanied by the occurrence of side reactions.

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