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Ultrathin hydrotalcite-based composite photoelectrode and application thereof in coupling of photoelectrolysis of water and organic matter oxidation reaction

A talc-based, composite light technology, applied in electrolytic organic production, electrodes, electrolytic components, etc., can solve problems that have not received enough attention, and achieve improved overall energy efficiency and molecular reaction efficiency, high atom economy, and easy operation Effect

Active Publication Date: 2020-05-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Compared with the widely studied hydrogen production process of water splitting, the research on the efficient use of water oxidation half-reactions to release oxygen molecules has not received enough attention

Method used

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  • Ultrathin hydrotalcite-based composite photoelectrode and application thereof in coupling of photoelectrolysis of water and organic matter oxidation reaction
  • Ultrathin hydrotalcite-based composite photoelectrode and application thereof in coupling of photoelectrolysis of water and organic matter oxidation reaction
  • Ultrathin hydrotalcite-based composite photoelectrode and application thereof in coupling of photoelectrolysis of water and organic matter oxidation reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A. Weigh 0.306g Co(NO3 ) 2 ·6H 2 O, 0.132g Al(NO 3 ) 3 9H 2 O, 0.424g urea, 0.07g NH 4 F. In a 250mL beaker, add 70mL deionized water, mix well, then add 1mL graphene water dispersion with a concentration of 1mg / mL, ultrasonically stir until a uniform solution is formed, ultrasonic power 50W, time 10min, temperature 20°C .

[0028] B. BiVO 4 The conductive surface of the electrode is tilted upwards by 45°, put it into the liner of the hydrothermal kettle, and add 4mL of the solution prepared in step A and 3mL of acetone (mass fraction ≥ 99.9%), so that the growth of BiVO 4 The part of the electrode is completely submerged in the solution, the ultrasonic power is 50W, the time is 5min, fully mixed, and the hydrothermal reaction is carried out at 100°C for 4h. After washing with water, dry in an oven at 60°C for 1 hour to obtain G@U-LDHs / BiVO 4 photoelectrode.

[0029] C. At room temperature, measure 8 mL of phosphate buffer solution (pH=7, 0.1 mol / L) in a closed...

Embodiment 2

[0034] A. Weigh 0.343g Ni(NO 3 ) 2 ·6H 2 O, 0.135g Al(NO 3 ) 3 9H 2 O, 0.435g urea, 0.07g NH 4 F. In a 250mL beaker, add 70mL deionized water, mix evenly, then add 1mL graphene water dispersion with a concentration of 1mg / mL, ultrasonically stir until mixed to form a uniform solution, ultrasonic power 50W, time 10min, temperature 20 ℃.

[0035] B. BiVO 4 The conductive surface of the electrode is tilted upwards by 45°, put it into the liner of the hydrothermal kettle, and add 4mL of the solution prepared in step A and 3mL of acetone (mass fraction ≥ 99.9%), so that the growth of BiVO 4 The part of the electrode is completely submerged in the solution, the ultrasonic power is 50W, the time is 5min, fully mixed, and the hydrothermal reaction is carried out at 100°C for 4h. After washing with water, dry in an oven at 60°C for 1 hour to obtain G@U-LDHs composite BiVO 4 photoelectrode.

[0036] C. At room temperature, measure 8 mL of phosphate buffer solution (pH=7, 0.1 m...

Embodiment 3

[0040] A. Weigh 0.446g Zn(NO 3 ) 2 ·6H 2 O, 0.134g Al(NO 3 ) 3 9H 2 O, 0.426g urea, 0.068g NH 4 F. In a 250mL beaker, add 70mL deionized water, mix evenly, then add 1mL graphene dispersion with a concentration of 1mg / mL, ultrasonically stir until a uniform solution is formed, ultrasonic power 50W, time 10min, temperature 20°C .

[0041] B. BiVO 4 The conductive surface of the electrode is tilted upwards by 45°, put it into the liner of the hydrothermal kettle, and add 4mL of the solution prepared in step A and 3mL of acetone (mass fraction ≥ 99.9%), so that the growth of BiVO 4 The part of the electrode is completely submerged in the solution, the ultrasonic power is 50W, the time is 5min, fully mixed, and the hydrothermal reaction is carried out at 100°C for 4h. After washing with water, dry in an oven at 60°C for 1 hour to obtain G@U-LDHs composite BiVO 4 photoelectrode.

[0042] C. At room temperature, measure 8 mL of phosphate buffer solution (pH=7, 0.1 mol / L) in...

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Abstract

The invention discloses an ultrathin hydrotalcite-based composite photoelectrode and an application of the ultrathin hydrotalcite-based composite photoelectrode in coupling of photoelectrolysis of water and organic matter oxidation reaction. The structure of the photoelectrode is that a compound of two-dimensional nanosheet graphene and ultrathin hydrotalcite grows on the surface of a bismuth vanadate electrode and is specifically expressed as a G@U-LDHs / BiVO4 photoelectrode. In a closed series electrolytic tank, the G@U-LDHs / BiVO4 photoelectrode is used as an anode, a Pt wire is used as a cathode, Ag / AgCl is used as a reference electrode, one or more paired anodes and cathodes and one reference electrode form a three-electrode system, an electrolyte and an organic matter are added, and anillumination reaction is carried out. Active oxygen species generated by photoelectrolysisof water are used for catalyzing oxidation reaction, an energy-consuming oxygen molecule activation process is not needed, and meanwhile hydrogen is generated on the photocathode. The method effectively improves the oxidation efficiency of organic matters, and significantly improves the overall energy efficiency and molecular reaction efficiency of a water photoelectrolysis reaction system.

Description

technical field [0001] The invention belongs to the field of photoelectrochemical synthesis, and in particular relates to an ultrathin hydrotalcite-based composite photoelectrode and its application in photoelectric water splitting coupling organic matter oxidation reaction. Background technique [0002] The development of human science and technology and social progress are inseparable from the huge demand for energy. The exploration and utilization of renewable energy (such as: solar energy, wind energy, biomass energy, etc.) is of great significance to the realization of my country's sustainable development strategy. Among various forms of renewable energy, solar energy has a huge amount of energy, and its use process is clean and pollution-free. It is one of the important objects of renewable energy utilization. At present, among the three main forms of solar energy utilization (photoelectric, photothermal, and photochemical), photochemical conversion can store light ene...

Claims

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Application Information

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IPC IPC(8): C25B11/04C25B3/10C25B1/04C25B3/29
CPCC25B1/04C25B3/29C25B11/051C25B11/091Y02E60/36
Inventor 项顼罗兰
Owner BEIJING UNIV OF CHEM TECH
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