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A tio with high-efficiency electrocatalytic oxygen reduction performance 2 /rgo composites

A composite material and electrocatalytic technology, applied in the field of electrocatalytic materials, can solve the problems of electrocatalytic oxygen reduction performance, etc., and achieve the effect of easy control of reaction parameters, process section, and low energy consumption

Inactive Publication Date: 2016-08-24
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano-TiO prepared by existing methods 2 Graphene composites do not have electrocatalytic oxygen reduction properties

Method used

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  • A tio with high-efficiency electrocatalytic oxygen reduction performance <sub>2</sub> /rgo composites
  • A tio with high-efficiency electrocatalytic oxygen reduction performance <sub>2</sub> /rgo composites
  • A tio with high-efficiency electrocatalytic oxygen reduction performance <sub>2</sub> /rgo composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In a 50mL small beaker, while stirring with a magnetic stirrer, add 10.00mL of absolute ethanol, 3.00mL of ethylene glycol stock solution (pure ethylene glycol), slowly add 10.00mL of tetrabutyl titanate, and stir for 5 min to form Light yellow transparent liquid, add 0.867g of ammonium fluoride, 1.406g of urea, 2mL of graphene oxide (1g / 100mL), stir until the solution is clear (about 5 min), and finally add 16.00mL of 6mol / L hydrochloric acid dropwise, stir well Finally, transfer the reaction solution into a 100mL autoclave, heat to 200°C, take it out after 10 hours at constant temperature, wash the product three times with absolute ethanol, then wash three times with twice distilled water, and put it in a vacuum distillation device at 50°C Distill under reduced pressure for 20 minutes to obtain a black powdery solid, which is TiO with high-efficiency electrocatalytic oxygen reduction performance. 2 / rGO composite material——TiO 2 / (1.5%) rGO.

[0041] Characterized ...

Embodiment 2

[0043] In a 50mL small beaker, while stirring with a magnetic stirrer, add 10.00mL of absolute ethanol and 3.00mL of ethylene glycol stock solution, slowly add 10.00mL of tetrabutyl titanate as the raw material, stir for 5min, a light yellow transparent liquid is formed, add fluoride Ammonium 0.867 g, urea 1.406 g, graphene oxide 4 mL (1 g / 100 mL), stirred until the solution was clear (about 5 min), and finally 16.00 mL of 6 mol / L hydrochloric acid was added dropwise, after fully stirring, the reaction solution was transferred to 100 In a 1 mL high-pressure reactor, heat to 200 ° C, take it out after 10 hours at constant temperature, wash the product three times with absolute ethanol, and then wash three times with double distilled water, put it in a vacuum distillation device for 20 minutes under reduced pressure at 50 ° C, A black powdery solid is obtained, which is TiO with high-efficiency electrocatalytic oxygen reduction performance. 2 / rGO composite material——TiO 2 / (3...

Embodiment 3

[0046] In a 50mL small beaker, while stirring with a magnetic stirrer, add 10.00mL of absolute ethanol and 3.00mL of ethylene glycol stock solution, slowly add 10.00mL of tetrabutyl titanate as the raw material, stir for 5min, a light yellow transparent liquid is formed, add fluoride Ammonium 0.867g, urea 1.406g, graphene oxide 6mL (1g / 100mL) fully stir the solution until it becomes clear (about 5 min), and finally add 6mol / L hydrochloric acid 16.00mL dropwise, after fully stirring, transfer the reaction solution into 100ml In a high-pressure reaction kettle, heated to 200°C, took it out after constant temperature for 10 hours, washed the product three times with absolute ethanol, then washed three times with double distilled water, put it in a vacuum distillation device for 20 minutes under reduced pressure at 50°C, and obtained Black powdery solid, which is TiO with high-efficiency electrocatalytic oxygen reduction performance 2 / rGO composite material——TiO 2 / (4.5%) rGO. ...

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Abstract

The invention relates to a TiO2 / rGO composite material with high-efficiency electrocatalytic oxygen reduction performance, belonging to the technical field of electrocatalytic materials. In the composite material of the present invention, the anatase phase-modified nano-TiO2 that N and F are co-doped into the nano-TiO2 lattice is attached to the surface of the reduced graphene oxide; the molar content of the reduced graphene oxide is 1.5-4.5%; The molar contents of N and F in the permanent nano-TiO2 are 1.07-1.19%, 0.95-1.04%, respectively. Compared with purely modified nano-TiO2, the composite material of the present invention has high electrocatalytic oxygen reduction performance in an oxygen-saturated 0.1 M KOH solution, the initial oxidation potential is about -0.2 V, and the maximum oxygen reduction current can reach On the order of 10‑5 mA cm‑2. In addition, the composite material of the present invention has the advantages of stable electrocatalytic oxygen reduction performance and high selectivity.

Description

technical field [0001] The invention relates to a TiO with high-efficiency electrocatalytic oxygen reduction performance 2 The / rGO composite material belongs to the technical field of electrocatalytic materials. Background technique [0002] A fuel cell is a power generation device that directly and continuously converts the chemical energy present in chemical fuels and oxidants into electrical energy. focus on. For alkaline fuel cells, the oxygen reduction performance of cathode materials is a key technology restricting its development. Generally speaking, the electrochemical oxygen reduction reaction has different reaction mechanisms due to different electrode materials, surface properties, and solution pH values. Generally, it can be divided into two-electron reactions, direct four-electron reactions, and two-step two-electron (2+2) reaction processes. , is considered as an ideal oxygen reduction pathway because the four-electron reaction process can obtain more elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/18H01M4/90
CPCY02E60/50
Inventor 于洁玫黄太仲刘宗明张以河翟利民
Owner UNIV OF JINAN
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