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Modified ferrihydrite/hematite nano-rod core-shell structure compound light anode and application thereof

A technology of core-shell structure and hematite is applied in the field of modified ferrihydrite/hematite nanorod core-shell structure composite photoanode, which can solve the problem of fast photogenerated electron-hole recombination, short hole diffusion length, red Iron ore has problems such as poor conductivity, and achieves the effects of avoiding electrodeposition, excellent stability, and easy operation

Inactive Publication Date: 2019-05-31
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to improve the existing defects of hematite such as poor conductivity, fast photogenerated electron-hole recombination, and short hole diffusion length, and provide a modified ferrihydrite / hematite nanorod core-shell structure composite Photoanode

Method used

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  • Modified ferrihydrite/hematite nano-rod core-shell structure compound light anode and application thereof
  • Modified ferrihydrite/hematite nano-rod core-shell structure compound light anode and application thereof
  • Modified ferrihydrite/hematite nano-rod core-shell structure compound light anode and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A modified ferrihydrite / hematite nanorod core-shell structure composite photoanode is prepared by the following steps:

[0034] Step S1: Prepare 0.3M FeCl 3 ·6H 2 O and 2M NaNO 3 The aqueous solution is used as the growth solution of hematite (that is, the precursor solution); the conductive glass is used as the conductive substrate, and it is placed obliquely in a stainless steel reactor lined with polytetrafluoroethylene, with the conductive side facing down, and the precursor solution Pour it into the lining until it is full of 3 / 4 of the lining; put the reaction kettle in an oven, heat it at 100°C for 8 hours, then cool it down to room temperature naturally, synthesize a FeOOH film on conductive glass by solvothermal synthesis, and use deionized After washing with water, dry in the air for later use.

[0035] Step S2: Put the conductive glass with FeOOH film prepared in step S1 into a muffle furnace, raise the temperature to 550°C at a rate of 10°C / min, and keep ...

Embodiment 2

[0038] A modified ferrihydrite / hematite nanorod core-shell structure composite photoanode, the preparation process of which is the same as in Example 1, except that the growth solution of hematite in step S1 is 0.15M FeCl 3 ·6H 2 O and 1M NaNO 3 aqueous solution; the reaction temperature is 95°C, and the reaction time is 4h; after the temperature is raised to 550°C in step S2, the holding time is 30min.

Embodiment 3

[0040] A modified ferrihydrite / hematite nanorod core-shell structure composite photoanode, the preparation process of which is the same as in Example 1, the difference being that the growth solution of hematite in step S1 is 0.15M FeCl 3 ·6H 2 O and 1M NaNO 3aqueous solution; in step S2, after the temperature is raised to 800° C., the holding time is 20 min.

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Abstract

The invention discloses a modified ferrihydrite / hematite nano-rod core-shell structure compound light anode and an application thereof. A preparation method of the light anode includes the steps: S1 preparing hematite growth solution, placing a conducting substrate into the hematite growth solution, synthesizing a FeOOH film on the conducting substrate by a solvent thermal synthesis method, washing the FeOOH film, and drying the washed FeOOH film for standby application; S2 performing high temperature annealing on the conducting substrate acquired in the step S1, and cooling the conducting substrate to obtain the conducting substrate with the hematite film surface; S3 preparing ferrihydrite growth solution, placing the conducting substrate acquired in the step S2 into the ferrihydrite growth solution, heating mixture, washing the conducting substrate after reaction is completed, and drying the washed conducting substrate to obtain the modified ferrihydrite / hematite nano-rod core-shellstructure compound light anode. According to the method, a ferrihydrite thin layer is loaded on the surface of the hematite to prepare the core-shell structure compound light anode which is resistantto light corrosion and good in photoelectrochemical property and stability, and the compound light anode can be used for decomposing water to generate hydrogen and is high in catalytic efficiency andstable in catalytic effect.

Description

technical field [0001] The invention relates to the technical field of material preparation and photocatalytic water splitting, in particular to a modified ferrihydrite / hematite nanorod core-shell structure composite photoanode and its application. Background technique [0002] With the gradual depletion of fossil fuels, increasingly serious environmental pollution, and rapidly growing energy demand, new clean, green, and renewable energy sources have gradually attracted widespread attention. Hydrogen has a high combustion calorific value. The heat generated per kilogram of hydrogen combustion is about 3 times that of gasoline, 3.9 times that of alcohol, and 4.5 times that of coke, and the product of combustion is water, so hydrogen is known as the world's most One of the greenest sources of energy in the world. At present, the industrial hydrogen production methods in my country at this stage mainly include the following mature and commonly used methods: first, methanol de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B1/04B82Y40/00
CPCY02E60/36Y02P20/133
Inventor 王新何晓琳陈志鸿黄兰艳
Owner SOUTH CHINA NORMAL UNIVERSITY
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