Three-dimensional rice-shaped TiO<2>/graphene composite hydrogel and preparation method therefor

A graphene composite and hydrogel technology, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems such as difficulty in recycling, easy aggregation of nanoparticles, uncontrollable morphology and performance, etc. Achieve the effect of benefiting electron transport, cheap and easy-to-obtain raw materials, and shortening diffusion and migration paths

Active Publication Date: 2016-11-09
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has the following disadvantages: the obtained TiO 2 The morphology is nano-particles, no special shape; sodium borohydride is a toxic reducing agent, not environmentally friendly; the preparation process is more complicated
The disadvantages of this invention: the reducin

Method used

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  • Three-dimensional rice-shaped TiO&lt;2&gt;/graphene composite hydrogel and preparation method therefor
  • Three-dimensional rice-shaped TiO&lt;2&gt;/graphene composite hydrogel and preparation method therefor
  • Three-dimensional rice-shaped TiO&lt;2&gt;/graphene composite hydrogel and preparation method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0043] (1) Preparation of GO aqueous solution

[0044] Combine 3g graphite powder, 30mL concentrated sulfuric acid, 3g K 2 S 2 O 8 , 3g P 2 O 5 Add them to the beaker in turn, sonicate for 5 minutes, place in a water bath, heat to 80°C and stir for 6 hours, and cool to room temperature; dilute with 1000 mL of distilled water and let stand overnight; suction filter the obtained diluent to form a filter cake, which is naturally dried overnight; Scrape the filter cake with a medicine spoon into a small beaker, add 150mL concentrated sulfuric acid, stir, and ultrasonic for 1h; under ice bath, slowly add 15g potassium permanganate to the ultrasonic solution, control the temperature to be less than 20℃, stir for 4h, then slowly Warm up to 40℃, stir and keep for 8h; then slowly add 300mL deionized water to the solution and stir for 2h at room temperature; continue to add 700mL deionized water and stir for 2h; then add 20mL hydrogen peroxide to obtain a bright yellow acidic GO aqueous sol...

Embodiment 2

[0048] (1) Preparation of GO aqueous solution

[0049] Combine 3g graphite powder, 30mL concentrated sulfuric acid, 3g K 2 S 2 O 8 , 3g P 2 O 5 Add them to the beaker in turn, sonicate for 5 minutes, place in a water bath, heat to 80°C and stir for 6 hours, and cool to room temperature; dilute with 1000 mL of distilled water and let stand overnight; suction filter the obtained diluent to form a filter cake, which is naturally dried overnight; Scrape the filter cake with a medicine spoon into a small beaker, add 150mL concentrated sulfuric acid, stir, and ultrasonic for 1h; under ice bath, slowly add 15g potassium permanganate to the ultrasonic solution, control the temperature to be less than 20℃, stir for 4h, then slowly Warm up to 40℃, stir and keep for 8h; then slowly add 300mL deionized water to the solution and stir for 2h at room temperature; continue to add 700mL deionized water and stir for 2h; then add 20mL hydrogen peroxide to obtain a bright yellow acidic GO aqueous sol...

Embodiment 3

[0053] (1) Preparation of GO aqueous solution

[0054] Combine 3g graphite powder, 30mL concentrated sulfuric acid, 3g K 2 S 2 O 8 , 3g P 2 O 5 Add them to the beaker in turn, sonicate for 5 minutes, place in a water bath, heat to 80°C and stir for 6 hours, and cool to room temperature; dilute with 1000 mL of distilled water and let stand overnight; suction filter the obtained diluent to form a filter cake, which is naturally dried overnight; Scrape the filter cake with a medicine spoon into a small beaker, add 150mL concentrated sulfuric acid, stir, and ultrasonic for 1h; under ice bath, slowly add 15g potassium permanganate to the ultrasonic solution, control the temperature to be less than 20℃, stir for 4h, then slowly Warm up to 40℃, stir and keep for 8h; then slowly add 300mL deionized water to the solution and stir for 2h at room temperature; continue to add 700mL deionized water and stir for 2h; then add 20mL hydrogen peroxide to obtain a bright yellow acidic GO aqueous sol...

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Abstract

The invention discloses a three-dimensional rice-shaped TiO<2>/graphene composite hydrogel and a preparation method therefor. Namely, a simple and environment-friendly one-step hydrothermal method is adopted; GO and TBT are used as the raw materials; sodium citrate is used as the structure-guiding agent; and water and ethyl alcohol are used as the solvent for synthesis. The prepared hydrogel is creative in structure; the macroscopic appearance of the hydrogen is black column-like material; the hydrogel is about 1-2cm in diameter and about 1-2cm in height; the TiO<2> nanoparticles with rice-shaped microstructure is loaded to a graphene sheet, wherein the TiO<2> nanoparticles are about 15-35nm in diameter and about 30-70nm in length; and the TiO<2> nanoparticles and the graphene sheet are woven mutually to form a net-shaped structure. The appearance and the property of the TiO<2>/graphene composite hydrogel are controllable; namely, the forming property and the stability of the gel can be controlled by regulating and controlling the additive amount of TBT and the hydrothermal time; and meanwhile, the composite hydrogel has the inherent attributes of the TiO<2> nanoparticles and the graphene, and a creative synergistic effect also can be generated as well.

Description

Technical field [0001] The invention belongs to the technical field of material synthesis, in particular to a three-dimensional rice-shaped TiO 2 / Graphene composite hydrogel and its preparation method. Background technique [0002] The carbon material has the advantages of good conductivity, large specific surface area, high chemical stability, and the carbon network can provide an effective path for electron transfer. It is an excellent electrochemical material. As a new member of the carbon family, graphene has attracted great attention in the field of materials science since its discovery in 2004. However, graphite electrodes have shortcomings such as easy disconnection of the circuit, easy deformation of the structure, and loss of initial capacity. In order to overcome these shortcomings, combining inorganic nanoparticles with graphene may be an effective solution. TiO 2 As an important transition metal oxide, due to its advantages of high activity, stability, non-toxicity...

Claims

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Application Information

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IPC IPC(8): H01G11/32H01G11/46H01G11/86C01B31/04
CPCY02E60/13H01G11/32H01G11/46H01G11/86
Inventor 周国伟刘亚萍高婷婷肖虹王淑敏
Owner QILU UNIV OF TECH
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