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Chlorine-doped titanium dioxide/carbon porous structure and preparation method thereof

A porous structure, titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, carbon preparation/purification, etc., can solve the problems of difficult operation, high safety hazard, low doping ratio, etc., and achieve low price and high Battery performance, effect of increasing specific surface area

Pending Publication Date: 2021-07-30
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a chlorine-doped titanium dioxide / carbon porous structure and its preparation method to solve the problems of difficult operation, high safety hazard and low doping ratio in the prior art.

Method used

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  • Chlorine-doped titanium dioxide/carbon porous structure and preparation method thereof
  • Chlorine-doped titanium dioxide/carbon porous structure and preparation method thereof
  • Chlorine-doped titanium dioxide/carbon porous structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Step 1), with 400mg commercial TiO 2 1. Add 100 mg of citric acid monohydrate to 50 mL of deionized water, stir for 30 min to mix evenly, then add 1 g of sodium alginate under constant stirring, and stir for 6 h to obtain a uniformly mixed suspension.

[0035] Step 2), drop the above suspension into 50mL zinc nitrate solution (1mol / L) drop by drop with a dropper, after standing for 12h, filter and remove the excess solution to obtain a colloid, and after freeze-drying, the available TiO2 / Zinc Alginate Complex.

[0036] Step 3), above-mentioned TiO 2 / Zinc alginate complex is heated from room temperature to 500°C at a rate of 2°C / min in argon and kept for 2 hours, and then 1mol / L HNO 3 Soak for 12 hours to remove the zinc oxide, then centrifuge and wash with water three times, and dry at 60°C to obtain TiO 2 / C porous structure.

[0037] Step 4), the 100mg above-mentioned TiO 2 / C porous structure with 2g NH 4 Cl was mixed and ground for 10 min to make it evenly m...

Embodiment 2

[0040] Step 1), with 500mg commercial TiO 2 1. Add 100 mg of citric acid monohydrate to 50 mL of deionized water, stir for 30 min to mix evenly, then add 1 g of sodium alginate under constant stirring, and stir for 6 h to obtain a uniformly mixed suspension.

[0041] Step 2), drop the above suspension into 50mL zinc nitrate solution (1mol / L) drop by drop with a dropper, after standing for 12h, filter and remove the excess solution to obtain a colloid, and after freeze-drying, the available TiO 2 / Zinc Alginate Complex.

[0042] Step 3), above-mentioned TiO 2 / Zinc alginate complex is heated from room temperature to 500°C at a rate of 2°C / min in argon and kept for 2 hours, and then 1mol / L HNO 3 Soak for 12 hours to remove the zinc oxide, then centrifuge and wash with water three times, and dry at 60°C to obtain TiO 2 / C porous structure.

[0043] Step 4), the 100mg above-mentioned TiO 2 / C porous structure with 2g NH 4 Cl was mixed and ground for 10 min to make it evenly...

Embodiment 3

[0046] Step 1), with 600mg commercial TiO 2 1. Add 100 mg of citric acid monohydrate to 50 mL of deionized water, stir for 30 min to mix evenly, then add 1 g of sodium alginate under constant stirring, and stir for 6 h to obtain a uniformly mixed suspension.

[0047] Step 2), drop the above suspension into 50mL zinc nitrate solution (1mol / L) drop by drop with a dropper, after standing for 12h, filter and remove the excess solution to obtain a colloid, and after freeze-drying, the available TiO 2 / Zinc Alginate Complex.

[0048] Step 3), above-mentioned TiO 2 / Zinc alginate complex is heated from room temperature to 500°C at a rate of 2°C / min in argon and kept for 2 hours, and then 1mol / L HNO 3 Soak for 12 hours to remove the zinc oxide, then centrifuge and wash with water three times, and dry at 60°C to obtain TiO 2 / C porous structure.

[0049] Step 4), the 100mg above-mentioned TiO 2 / C porous structure with 2g NH 4 Cl was mixed and ground for 10 min to make it evenly...

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Abstract

The invention provides a chlorine-doped titanium dioxide / carbon porous structure and a preparation method thereof. The preparation method comprises the steps of calcining TiO2 / zinc alginate colloid for 0.2-4 h at the temperature of 400-600 DEG C in the argon atmosphere to obtain a TiO2 / C porous structure; and uniformly mixing and grinding the TiO2 / C porous structure and NH4Cl, and calcining at the temperature of 300-500 DEG C for 0.2-4 hours in an argon atmosphere to obtain the chlorine-doped titanium dioxide / carbon porous structure. The specific surface area is increased by constructing the porous structure, the subsequent Cl doping process is facilitated, and finally uniform and high-proportion doping of Cl in the TiO2 / C porous structure is achieved; and the Cl-doped TiO2 / C porous structure prepared by the invention is green and nontoxic in raw material and low in price, the battery performance is improved on the premise of ensuring safety and environmental protection, the production cost is reduced, and the Cl-doped TiO2 / C porous structure is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for sodium ion batteries, in particular to a chlorine (Cl) doped titanium dioxide / carbon (TiO 2 / C) porous structure and preparation method. Background technique [0002] Titanium dioxide (TiO 2 ) materials have been widely used in photocatalysis, solar cells, fuel cells, photoelectric conversion, lithium-ion batteries, sodium-ion batteries, supercapacitors and other fields due to their advantages of low cost, no pollution, stable structure, and good biocompatibility. As an anode material for sodium-ion batteries, TiO 2 The theoretical capacity is as high as 335mAh g -1 , and due to its extremely stable chemical properties, small volume expansion during charge and discharge, and good cycle stability, it is a class of electrode materials with great research value. [0003] However TiO 2 Due to the difficulty of intercalating sodium ions and poor conductivity, the actual capacity exh...

Claims

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Application Information

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IPC IPC(8): C01G23/047C01B32/05H01M4/48H01M4/62H01M10/054
CPCC01G23/08C01B32/05H01M4/483H01M4/625H01M10/054C01P2004/03C01P2002/85Y02E60/10
Inventor 沈少华刁志丹
Owner XI AN JIAOTONG UNIV
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