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Ti-doped alpha-Fe2O3 nanorod composite MOFs heterojunction photo-anode and preparation method and application thereof

A -fe2o3, heterojunction technology, applied in the direction of photosensitive equipment, photovoltaic power generation, electrical components, etc., can solve the problems of difficult operation, complicated process, and limitation of photoanode water splitting performance, so as to achieve improved separation, simple process, good photoelectricity The effect of catalytic ability to split water

Active Publication Date: 2020-06-09
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned technologies are mainly through the introduction of high-valence doping elements to enhance the intrinsic conductivity, or the use of other semiconductor materials and α-Fe 2 o 3 Form a heterojunction to promote the separation of electron-hole pairs, but still have the problems of complex process, difficult operation and high heterojunction interface charge migration barrier, which limits the water splitting performance of photoanodes

Method used

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  • Ti-doped alpha-Fe2O3 nanorod composite MOFs heterojunction photo-anode and preparation method and application thereof
  • Ti-doped alpha-Fe2O3 nanorod composite MOFs heterojunction photo-anode and preparation method and application thereof
  • Ti-doped alpha-Fe2O3 nanorod composite MOFs heterojunction photo-anode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this example, Ti doped with α-Fe 2 o 3 A method for preparing a nanorod composite MOFs heterojunction photoanode, comprising the following steps:

[0034] 1) To Ti 3 AlC 2 Hydrofluoric acid was slowly added dropwise into the solution, Ti 3 AlC 2 The solid-to-liquid mass ratio with hydrofluoric acid is 1:5, and the stirring is continued for 24 hours to obtain Ti 3 C 2 solution;

[0035] 2) Ti will be obtained 3 C 2 The solution was cleaned by centrifugation with deionized water, and dried in a vacuum oven to obtain Ti 3 C 2 powder;

[0036] 3) 0.5 parts by mass of ferric chloride hexahydrate, 0.01 parts by mass of Ti 3 C 2 and 0.1 mass parts of urea were dissolved in 50 mass parts of deionized water, and stirred for 5 min to obtain Ti-doped α-Fe 2 o 3 Precursor solution;

[0037] 4) Conductive glass is placed in the reactor, the conductive surface of the conductive glass faces the inner wall of the reactor; then the Ti doped α-Fe 2 o 3 The precursor ...

Embodiment 2

[0041] In this example, Ti doped with α-Fe 2 o 3 A method for preparing a nanorod composite MOFs heterojunction photoanode, comprising the following steps:

[0042] 1) To Ti 3 AlC 2 Hydrofluoric acid was slowly added dropwise into the solution, Ti 3 AlC 2 The solid-to-liquid mass ratio with hydrofluoric acid is 1:10, and the stirring is continued for 36 hours to obtain Ti 3 C 2 solution;

[0043] 2) Ti will be obtained 3 C 2 The solution was cleaned by centrifugation with deionized water, and dried in a vacuum oven to obtain Ti 3 C 2 powder;

[0044] 3) 1 mass part of ferric chloride hexahydrate, 0.02 mass part of Ti 3 C 2 and 0.5 parts by mass of urea were dissolved in 50 parts by mass of deionized water and stirred for 20 min to obtain Ti-doped α-Fe 2 o 3 Precursor solution;

[0045] 4) Conductive glass is placed in the reactor, the conductive surface of the conductive glass faces the inner wall of the reactor; then the Ti doped α-Fe 2 o 3 The precursor sol...

Embodiment 3

[0050] In this example, Ti doped with α-Fe 2 o 3 A method for preparing a nanorod composite MOFs heterojunction photoanode, comprising the following steps:

[0051] 1) To Ti 3 AlC 2 Hydrofluoric acid was slowly added dropwise into the solution, Ti 3 AlC 2 The solid-to-liquid mass ratio with hydrofluoric acid is 1:20, and the stirring is continued for 48 hours to obtain Ti 3 C 2 solution;

[0052] 2) Ti will be obtained 3 C 2 The solution was cleaned by centrifugation with deionized water, and dried in a vacuum oven to obtain Ti 3 C 2 powder;

[0053] 3) 0.75 parts by mass of ferric chloride hexahydrate, 0.03 parts by mass of Ti 3 C 2 and 0.3 parts by mass of urea were dissolved in 50 parts by mass of deionized water, and stirred for 30 min to obtain Ti-doped α-Fe 2 o 3 Precursor solution;

[0054] 4) Conductive glass is placed in the reactor, the conductive surface of the conductive glass faces the inner wall of the reactor; then the Ti doped α-Fe 2 o 3 The p...

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Abstract

The invention discloses a Ti-doped alpha-Fe2O3 nanorod composite MOFs heterojunction photo-anode and a preparation method and application thereof. The method comprises the following steps: 1), Ti3AlC2and hydrofluoric acid are subjected to a stirring reaction, and a Ti3C2 solution is obtained; 2) centrifugal cleaning and drying treatment are carried out on the Ti3C2 solution to obtain Ti3C2 powder; 3) Ti3C2 powder, ferric trichloride hexahydrate and urea are dissolved in water to obtain a Ti-doped alpha-Fe2O3 precursor solution; 4) a hydrothermal reaction is carried out on the alpha-Fe2O3 precursor solution to obtain a Ti-FeOOH nanorod array; 5) calcining treatment is carried out on the Ti-FeOOH nanorod array to obtain a Ti-doped alpha-Fe2O3 nanorod array; and 6) chemical vapor depositionis carried out on the Ti-doped alpha-Fe2O3 nanorod array to obtain the Ti-doped alpha-Fe2O3 nanorod composite MOFs heterojunction photo-anode. The MOFs layer grows on the alpha-Fe2O3 nanorod array insitu, the electron directional transmission capability is improved through the alpha-Fe2O3 nanorod array structure, the recombination probability of photo-induced electrons and holes is reduced through the MOFs layer, and the photoelectrocatalysis performance is significantly improved.

Description

technical field [0001] The invention relates to the technical field of photoanodes, in particular to a Ti-doped α-Fe2O3 nanorod composite MOFs heterojunction photoanode and its preparation method and application. Background technique [0002] At present, the main energy consumed by the world is coal, oil, and natural gas-based fossil energy. Judging from the total amount of existing fossil energy in the world, with the current consumption and expected consumption growth rate, the depletion of fossil energy has become an inevitable fact. The forecast data shows that most of the fossil energy will be exhausted in this century. Therefore, the development of clean new energy has become the consensus of all countries in the world. As a resource-rich and recyclable natural energy, solar energy has many advantages, such as universal availability, green and harmless, compared with fossil energy. At present, the conversion and utilization of solar energy are mainly through photothe...

Claims

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Application Information

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IPC IPC(8): H01G9/20
CPCH01G9/20H01G9/2022H01G9/2027Y02E10/542
Inventor 何漩肖丰田盼汪花丽吴海洋陈辉方伟李薇馨赵雷
Owner WUHAN UNIV OF SCI & TECH
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