Oxygen hole-containing BiOBr/TiO2 nanotube array composite electrode and preparation method thereof, and application of BiOBr/TiO2 nanotube array composite electrode to photoelectrocatalytic nitrogen fixation

A nanotube array, composite electrode technology, applied in electrodes, electrolytic coatings, electrophoretic plating, etc., can solve the problems of large energy band gap, high photo-generated electron recombination rate, limited application, etc., to reduce the recombination rate and stability. Good and efficient selective synthesis

Active Publication Date: 2021-02-23
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

TiO 2 Due to its clean and non-toxic, high mechanical strength, and stable physical and chemical properties, it is favored by people. However, its large energy band gap can only absorb part of the sunlight and the high recombination rate of photogenerated electrons limits its application.

Method used

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  • Oxygen hole-containing BiOBr/TiO2 nanotube array composite electrode and preparation method thereof, and application of BiOBr/TiO2 nanotube array composite electrode to photoelectrocatalytic nitrogen fixation
  • Oxygen hole-containing BiOBr/TiO2 nanotube array composite electrode and preparation method thereof, and application of BiOBr/TiO2 nanotube array composite electrode to photoelectrocatalytic nitrogen fixation
  • Oxygen hole-containing BiOBr/TiO2 nanotube array composite electrode and preparation method thereof, and application of BiOBr/TiO2 nanotube array composite electrode to photoelectrocatalytic nitrogen fixation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) The base material is conductive glass (FTO) with a thickness of 2.2 mm and a size of 2 cm×3 cm. After the FTO was ultrasonically cleaned with acetone, ethanol and deionized water for 20 min each, it was blown dry with pure nitrogen.

[0042] (2) Add 2mmol of Bi(NO 3 ) 3 ·5H 2 Dissolve O in 30mL of ethylene glycol, and then add NaBr in an equal amount to it under magnetic stirring. After it is completely dissolved, add 200mg of polyvinylpyrrolidone, stir for 0.5-1h, and then transfer to a 50mL hydrothermal kettle In 160 ℃ hydrothermal reaction for 12h. After the reaction, the hydrothermal kettle was naturally cooled to room temperature, and the product was centrifuged and washed 3 times with absolute ethanol and deionized water, and then dried in an oven at 60°C for 6 hours to obtain a brownish-yellow ν O - BiOBr powder.

[0043] (3) Prepare 1mg·mL -1 of ν O -BiOBr acetone solution, to which 0.05g of I was added 2 Simple substance. With FTO in step (1) as ca...

Embodiment 2

[0046] (1) The base material is an industrial titanium plate with a thickness of 2mm and a size of 2cm×3cm. The surface is polished with metallographic sandpaper until there are no scratches, cleaned ultrasonically with acetone, ethanol and three times of water, and dried for later use. Prepare a 0.5wt% HF electrolyte, use an industrial titanium plate as an anode and platinum as a counter electrode at room temperature, electrochemically anodize at 30V for 1h, and then heat-treat at 500°C for 2h, that is, the surface of the industrial titanium plate is obtained. ordered TiO 2 The film layer of the nanotube array ( figure 1 a and b).

[0047] (2) ν O -The preparation of the BiOBr nanosheets is the same as in Example 1.

[0048] (3) Prepare 1mg·mL -1 of ν O -BiOBr acetone solution, add 0.05g of I in this solution of 30~50mL 2 Simple substance. The TiO prepared in step (1) 2 Nanotube array as cathode, Ti foil as anode, ν O -BiOBr's acetone solution is used as the electrol...

Embodiment 3

[0051] (1) TiO 2 The preparation of the nanotube array film layer is the same as in Example 2.

[0052] (2) ν O -The preparation of the BiOBr nanosheets is the same as in Example 1.

[0053] (3) Prepare 1mg / mL of ν O -BiOBr acetone solution, to which 0.05g of I was added 2 elemental substance to increase the electropositivity of the solute. The TiO prepared in (1) 2 Nanotube array as cathode, Ti foil as anode, ν O -The acetone solution of BiOBr is used as the electrolyte, under the DC voltage of 10V, after ultrasonic electrophoresis for 20min, 10V-20min-ν O -BiOBr / TiO 2 Nanotube array composite electrode ( figure 1 c and d). ν O -BiOBr particles exhibit a flower-like morphology composed of nanosheets. figure 2 TiO 2 nanotube array and ν O -BiOBr / TiO 2 XRD pattern of the nanotube array composite electrode. TiO 2 The nanotube array is anatase crystal form, when deposited ν O -After BiOBr particles, compared with pure substrate, except TiO 2 In addition to the ...

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Abstract

The invention discloses an oxygen hole-containing BiOBr / TiO2 nanotube array composite electrode and a preparation method thereof, and application of the BiOBr / TiO2 nanotube array composite electrode to photoelectrocatalytic nitrogen fixation. The preparation method comprises the following steps: synthesizing vO-BiOBr powder by adopting a hydrothermal method, preparing a TiO2 nanotube array on a Tisubstrate by adopting an electrochemical anodic oxidation method, and loading the vO-BiOBr powder on the TiO2 nanotube array by adopting an electrophoretic deposition method to prepare the vO-BiOBr / TiO2 nanotube array composite electrode. The prepared vO-BiOBr / TiO2 nanotube array composite electrode is used as a working electrode, a Pt sheet is used as a counter electrode, Ag / AgCl is used as a reference electrode, an aqueous H2SO4 solution is used as an electrolyte solution, and a photoelectrocatalytic synthesis ammonia reaction can be carried out under the irradiation of a xenon lamp.

Description

technical field [0001] The invention belongs to the technical field of photoelectric catalysis composite electrode materials, in particular to a kind of BiOBr / TiO photoelectric catalysis nitrogen fixation 2 Nanotube array composite electrodes. Background technique [0002] As an important chemical product, ammonia is widely used in agriculture, industry, manufacturing and other fields with an average annual output of 20 billion tons, maintaining the survival and development of hundreds of millions of people around the world. At the same time, as a high hydrogen density gas, ammonia is often used to replace hydrogen for transportation and storage due to its high calorific value and easy liquefaction, and its clean, efficient and environmentally friendly characteristics make it widely used in the field of transportation and aviation . However, as a high-energy-density industry, synthetic ammonia consumes 1% to 2% of the global energy supply to maintain the required energy in...

Claims

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Application Information

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IPC IPC(8): C25B11/091C25B11/063C25D11/26C25D13/12C25D13/02C25B1/55C25B1/27
CPCC25B1/00C25D11/26C25D13/02C25D13/12
Inventor 孙岚林生林昌健
Owner XIAMEN UNIV
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