High-activity electrochemical self-doped TiO2 nanotube-based material as well as preparation and application thereof

A nanotube and self-doping technology, which is applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of reducing CO2 output and low light utilization rate, slow reaction rate, and high activation energy. , to achieve the effect of improving electrical conductivity, easy separation, and catalytic activity

Active Publication Date: 2021-07-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention solves the problem of TiO in the prior art 2 The surface is difficult to interact with CO 2 Establishes efficient chemisorption, leading to reduction of CO 2 The activation energy of the reaction is high, the reaction rate is slow, and the photocatalytic reduction of CO 2 The technical problem of low output and light utilization

Method used

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  • High-activity electrochemical self-doped TiO2 nanotube-based material as well as preparation and application thereof
  • High-activity electrochemical self-doped TiO2 nanotube-based material as well as preparation and application thereof
  • High-activity electrochemical self-doped TiO2 nanotube-based material as well as preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A highly active electrochemical self-doped TiO 2 Preparation of Nanotube-Based Materials and Its Gas-Phase Photoelectrocatalytic Reduction of CO 2 method, including the following steps:

[0041] (1) Preparation of TiO 2 nanotube

[0042] The Ti sheet was cut to a size of 3cm×3.5cm, immersed in an ethylene glycol solution containing 3.109g / L ammonium fluoride and 11.75% (volume ratio) deionized water under a two-electrode system, and a platinum electrode was used as a counter electrode at 50V Voltage etching for 6 hours. Will get TiO 2 The nanotube precursor was placed in a muffle furnace and calcined at 450 °C for 60 min to obtain anatase TiO 2 nanotube.

[0043] (2) Preparation of electrochemical self-doping TiO 2 nanotube

[0044] The material obtained in step (1) is used as a working electrode, the saturated calomel electrode is used as a reference electrode, the platinum sheet electrode is used as a counter electrode, and the electrolyte is 0.1M Na 2 SO 4 ...

Embodiment 2

[0050] A highly active electrochemical self-doped TiO 2 Preparation of Nanotube-Based Materials and Its Gas-Phase Photoelectrocatalytic Reduction of CO 2 method, including the following steps:

[0051] (1) Preparation of TiO 2 nanotube

[0052] The Ti sheet was cut to a size of 3cm×3.5cm, immersed in an ethylene glycol solution containing 3.109g / L ammonium fluoride and 11.75% (volume ratio) deionized water under a two-electrode system, and a platinum electrode was used as a counter electrode at 60V Voltage etching for 6 hours. Will get TiO 2 The nanotube precursor was placed in a muffle furnace and calcined at 450 °C for 60 min to obtain anatase TiO 2 nanotube.

[0053] (2) Preparation of electrochemical self-doping TiO 2 nanotube

[0054] The material obtained in step (1) is used as the working electrode, the saturated calomel electrode is used as the reference electrode, the platinum sheet electrode is the counter electrode, and the electrolyte is 0.1M K 2 SO 4 sol...

Embodiment 3

[0060] A highly active electrochemical self-doped TiO 2 Preparation of Nanotube-Based Materials and Its Gas-Phase Photoelectrocatalytic Reduction of CO 2 method, including the following steps:

[0061] (1) Preparation of TiO 2 nanotube

[0062] The Ti sheet was cut to a size of 3cm×3.5cm, immersed in an ethylene glycol solution containing 3.109g / L ammonium fluoride and 11.75% (volume ratio) deionized water under a two-electrode system, and a platinum electrode was used as a counter electrode at 60V Voltage etching for 6 hours. Will get TiO 2 The nanotube precursor was placed in a muffle furnace and calcined at 450 °C for 60 min to obtain anatase TiO 2 nanotube.

[0063] (2) Preparation of electrochemical self-doping TiO 2 nanotube

[0064] The material obtained in step (1) is used as the working electrode, the saturated calomel electrode is used as the reference electrode, the platinum sheet electrode is the counter electrode, and the electrolyte is 0.5M K 2 SO 4 sol...

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Abstract

The invention discloses a high-activity electrochemical self-doped TiO2 nanotube-based material as well as preparation and application thereof, and belongs to the field of gas-phase photoelectric catalytic materials. The TiO2 nanotube is reduced to increase Ti < 3 + > and oxygen vacancy defects, so that the conductivity of the TiO2 nanotube is greatly improved, metal is further loaded by adopting a square wave pulse deposition method, active sites on the surface of the material are increased, and photo-induced electron-hole recombination is reduced, so that the TiO2 nanotube-based material with both conductivity and catalytic activity is obtained. The material is used for constructing a gas-phase photoelectrocatalysis system, CO2 is reduced into an alkane energy substance, photon-generated carriers are forcibly separated by applying tiny voltage, and compared with photocatalysis, higher photo-generated electron-hole separation efficiency and catalytic activity are shown, the defects that electrolyte needs to be added, CO2 solubility is low, products are difficult to separate and the like in traditional liquid-phase photoelectrocatalysis are overcome, and the generated products are gaseous alkane hydrocarbon and oxygen mixtures and are easy to separate.

Description

technical field [0001] The invention belongs to the field of gas-phase photocatalytic materials, and more specifically relates to a highly active electrochemical self-doped TiO 2 Nanotube-based materials and their preparation and applications. Background technique [0002] Atmospheric CO 2 The concentration is about 400ppm. If the emission is not restricted, it is expected to be as high as 1000ppm or more by 2100, which will cause the earth's sea level and average temperature to rise simultaneously. Therefore, there is an urgent need for humans to develop technologies that can reduce CO in the atmosphere 2 concentration of advanced technology, the CO 2 Transform into various useful high-value products to realize the "closed-loop" carbon cycle process. However, to fully achieve this goal, efficient CO adsorption is required during the activation process. 2 And input enough energy. [0003] Heterogeneous photocatalytic reduction of CO 2 is a proven technology because of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/04C25B3/21C25B3/26C25B3/03C25B1/02C25B1/55B22F1/00B22F9/24B82Y30/00B82Y40/00C25C5/02
CPCC25B11/04C25B1/02C25C5/02B22F9/24B82Y40/00B82Y30/00B22F1/07B22F1/054
Inventor 张延荣潘鸿辉孙明辉汪晓光
Owner HUAZHONG UNIV OF SCI & TECH
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