Self-supporting carbon-based TiO2 electro-catalytic material as well as preparation method and application thereof

Abstract

The invention discloses a self-supporting carbon-based TiO2 electro-catalytic material as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out ultrasonic cleaning and drying on expanded graphite powder; putting into an aniline-ethanol solution, and carrying out ultrasonic treatment; adding the EG-PAN into a hydrochloric acid-sulfuric acid mixed acid solution, adding ammonium persulfate while stirring, stirring at low temperature, filtering and drying to obtain EG-PAN powder; the preparation method comprises the following steps: weighing EG-PAN powder, and mixing the EG-PAN powder with tetrabutyl titanate and absolute ethyl alcohol to obtain a mixed solution A; mixing absolute ethyl alcohol, deionized water and concentrated nitric acid according to a certain volume ratio to obtain a mixed solution B; dropwise adding the mixed solution B into the mixed solution A, and standing until a non-flowing gel system is formed; drying in a drying oven to obtain black gray particles; and grinding the mixture into powder, and calcining the powder to obtain EG-PAN-TiO2 powder. The prepared self-supporting carbon-based TiO2 electro-catalytic material can be formed at a time, and the electro-catalytic oxygen reduction reaction efficiency is effectively improved.

Description

technical field [0001] The invention relates to the technical field of electrocatalysis, in particular to a self-supporting carbon-based TiO 2 Electrocatalytic materials and their preparation methods and applications. Background technique [0002] With the improvement of people's requirements for water quality, the advanced treatment of sewage is essential. The EF-like based on fenton technology continues to develop. Among them, the heterogeneous EF-like does not produce secondary pollution and has higher efficiency. high and has been extensively studied. TiO 2 With excellent electron-hole generation rate, it is an ideal electrode material, but its own conductivity is not high, and it needs to be used in combination with supporting materials to play a role in electrochemical reactions. Carbon-based catalytic materials have attracted extensive attention because of their stable performance, high catalytic performance, low price, strong plasticity and easy processing. [00...

AI Technical Summary

Problems solved by technology

[0003]Common carbon-based TiO2 is mostly in powder form, and needs to be coated with a binder on the supporting electrode, but this will Increase the mass transfer contact resistance between the active material and the carrier, reduce the charge transfer efficiency and mass transfer efficiency

In addition to adhesive embedding, 3D electrodes have also attracted attention, but this method has the problems of using many reagents in the preparation process, small area of ​​connection points of intermolecular forces, and limited mechanical strength.

[0004] At present, there are also composite materials made of expanded graphite (EG) and TiO2. The properties of this material are not stable, and TiO2 The distribution is not uniform enough, this problem may be more obvious in mass production

Images