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Photocathode material for preparing formic acid by reducing CO2 and preparation method thereof

A technology of photocathode and formic acid, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, artificial filaments of inorganic raw materials, etc. It can solve the problems of limited separation efficiency of photogenerated charges, reduction of reaction overpotential, and decline of electron reduction ability.

Active Publication Date: 2021-08-27
TAIZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of this type of modification are that the built-in electric field of the type II heterojunction has a narrow range of action, the separation efficiency of photogenerated charges is limited, and the electron reduction ability after separation is reduced, which is not conducive to reducing the overpotential of the reaction; in addition , due to the lack of reduced CO 2 catalytic sites, a single type II heterojunction is difficult to effectively activate CO 2 Molecules, non-selective for multiple reaction pathways at the interface

Method used

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  • Photocathode material for preparing formic acid by reducing CO2 and preparation method thereof
  • Photocathode material for preparing formic acid by reducing CO2 and preparation method thereof

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[0028] The present invention provides a method for CO 2 A method for preparing a photocathode material for reducing formic acid, comprising the following steps;

[0029] mixing bismuth nitrate, ferric nitrate, citric acid, water and polyvinylpyrrolidone to obtain a spinning solution;

[0030] The polyvinyl alcohol aqueous solution is spin-coated onto the FTO surface to obtain a spinning substrate;

[0031] performing electrospinning on the surface of the spinning substrate by using the spinning solution to obtain three-dimensional nanofibers;

[0032] The three-dimensional nanofibers were calcined to obtain BiFeO 3 Nanofiber photoelectrodes;

[0033] With the BiFeO 3 The nanofiber optoelectronic electrode is used as the substrate, and ZnTe is used as the evaporation source to conduct evaporation coating to obtain ZnTe-loaded BiFeO 3 electrode;

[0034] BiCl 3, thioacetamide and dimethylformamide were mixed, and the ZnTe-supported BiFeO 3 The electrode is subjected to h...

Embodiment 1

[0056] Weigh 0.78g of bismuth nitrate, 0.48g of ferric nitrate and 0.1g of citric acid respectively, add them into 10mL of deionized water, and stir to dissolve. Then 0.6 g of polyvinylpyrrolidone was added and stirred overnight to obtain a spinning solution. The FTO glass was fixed on the drum of the electrospinning device, and the aqueous solution of polyvinyl alcohol was spin-coated on the FTO surface before spinning to enhance the adhesion of FTO. Pour the spinning solution into the syringe, and set the parameters of the electrospinning process: the spinning voltage is 20kV, the drum speed is 150r / min, and the propulsion speed is 2mm / h, and three-dimensional nanofibers are obtained. Subsequently, the fiber was taken out and placed in a muffle furnace at 700°C for calcination for 5 hours to obtain BiFeO 3 nanofiber photoelectrode; the above BiFeO 3 The nanofiber photoelectrode is fixed on the substrate of the thermal evaporation coating machine, with ZnTe as the evaporati...

Embodiment 2

[0062] Weigh 1.17g of bismuth nitrate, 0.72g of ferric nitrate and 0.2g of citric acid respectively, add them into 10mL of deionized water, and stir to dissolve. Then 0.8 g of polyvinylpyrrolidone was added and stirred overnight to obtain a spinning solution. The FTO glass was fixed on the drum of the electrospinning device, and the aqueous solution of polyvinyl alcohol was spin-coated on the FTO surface before spinning to enhance the adhesion of FTO. Pour the spinning solution into the syringe, and set the parameters of the electrospinning process: spinning voltage 18kV, drum speed 200r / min, and propulsion speed 2mm / h, to obtain three-dimensional nanofibers. Subsequently, the fiber was taken out and placed in a muffle furnace at 800°C for calcination for 3 hours to obtain BiFeO 3 nanofiber photoelectrode; the above BiFeO3 The nanofiber photoelectrode is fixed on the substrate of the thermal evaporation coating machine, with ZnTe as the evaporation source, the vacuum in the c...

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Abstract

The invention provides a photocathode material for preparing formic acid by reducing CO2 and a preparation method of the photocathode material, and belongs to the technical field of photocathode materials. The BiFeO3 / ZnTe / Bi-S composite photocathode is constructed through dual modification strategies of ferroelectric polarization and interface water activation, and ZnTe carrier separation and interface reaction efficiency maximization are realized through charge driving force of a BiFeO3 polarization electric field, H2O and CO2 adsorption activation capability of a Bi-S interface and a photoelectric synergistic effect, so that ZnTe reaction overpotential is effectively reduced, and the selectivity of directionally converting CO2 into formic acid is improved.

Description

technical field [0001] The invention relates to the technical field of photoelectrode materials, in particular to a CO 2 A photocathode material for the reduction of formic acid and a preparation method thereof. Background technique [0002] Extensive use of fossil energy causes CO 2 The massive emission and accumulation of greenhouse gases, the CO 2 Reducing it to carbon-based fuel or chemical raw material will help realize the sustainable development of human beings. Currently, artificial CO 2 The conversion methods mainly include high-temperature catalytic hydrogenation method, electrocatalytic reduction method, photocatalytic and photocatalytic conversion methods, etc., among which photocatalytic carrier separation efficiency is low, electrocatalytic overpotential is high, and photocatalytic combined photocatalytic The advantages of low energy consumption and high energy efficiency of electrocatalysis are beneficial to reduce the overpotential of the reaction and avo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/07C25B11/091B01J27/043B01J35/06B01J37/34B01J37/10D01F9/08D06M11/52D06M11/83
CPCB01J27/043B01J37/342B01J37/10B01J37/348D01F9/08D06M11/52D06M11/83B01J35/33B01J35/58B01J35/40B01J35/39
Inventor 熊贤强张晓陈啸武承林薛红川范利亚张川群韩得满
Owner TAIZHOU UNIV
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