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Preparation method for hematite nanorod array photoanode modified by lead zirconate titanate

A nanorod array, lead zirconate titanate technology, applied in the field of catalysis, can solve problems such as compounding, and achieve the effects of simple process, excellent stability, photocatalytic hydrogen production performance, and improved efficiency

Active Publication Date: 2019-10-22
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the serious problem of recombination of photo-generated carriers produced by the simple hematite photoanode produced by the current hydrothermal method after being illuminated. A layer of lead zirconate titanate film was formed; since lead zirconate titanate is a ferroelectric material, after the hematite nanorods are excited by light to generate electrons and holes, the internal electric field of the lead zirconate titanate film itself will affect the internal electric field of the hematite. The charge distribution makes electrons and holes spatially separated and inhibits their recombination, thereby improving the efficiency of photolysis of water; the lead zirconate titanate-modified hematite nanorod composite photoanode shows more excellent stability and photocatalytic hydrogen production performance

Method used

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  • Preparation method for hematite nanorod array photoanode modified by lead zirconate titanate

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Embodiment 1

[0033] A preparation method of a hematite nanorod array photoanode modified by lead zirconate titanate, comprising the following steps:

[0034] S1. Preparation containing 0.3M FeCl 3 ·6H 2 O (0.3mol / L) and 2M NaNO 3 (2mol / L) aqueous solution as the growth solution of hematite;

[0035] S2. Using conductive glass as the conductive substrate, place it obliquely in a polytetrafluoroethylene-lined stainless steel reactor with the conductive side facing down, and pour the precursor solution into the lining to fill 3 / 4 of the lining; Place the reaction kettle in an oven and heat it at 100°C for 8 hours, then cool it down to room temperature naturally, synthesize a FeOOH film on conductive glass by hydrothermal synthesis, wash it with deionized water, and dry it in air for later use;

[0036] S3. Prepare a lead zirconate titanate precursor solution. 0.22M Pb(CH 3 COO) 2 ·3H 2 O (10% excess), 0.04M Zr(OC 4 h 9 ) 4 and 0.16M Ti(OC 4 h 9 ) 4 Dissolve in methanol or ethyle...

Embodiment 2

[0040] A preparation method of a hematite nanorod array photoanode modified by lead zirconate titanate, the difference between the preparation method and Example 1 is 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, the reaction time is 4h.

Embodiment 3

[0042] A preparation method of a hematite nanorod array photoanode modified by lead zirconate titanate, the difference between the preparation method and Example 1 is that the growth solution of hematite in step S1 is 0.15M FeCl 3 ·6H 2 An aqueous solution of O and 0.2M urea; the reaction temperature is 100°C, and the reaction time is 12h.

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Abstract

The invention specifically relates to a preparation method for a hematite nanorod array photoanode modified by lead zirconate titanate, belonging to the field of photoelectric materials and catalysis.The preparation method comprises the following steps: S1, preparing an alpha-Fe2O3 growth-promoting solution which comprises a ferric iron salt and an auxiliary agent, wherein the concentration of Fe<3+> in the growth-promoting solution is 0.15-0.3 M, and the auxiliary agent is sodium nitrate or urea; S2, immersing a conductive substrate in the growth-promoting solution, and carrying out a reaction at 95-100 DEG C for 4-12 h; S3, preparing a lead zirconate titanate precursor solution; S4, coating the conductive substrate treated in the step S2 with the precursor solution prepared in the stepS3 in a spin-coating manner; and S5, calcining the conductive substrate having undergone spin coating in the step S4. The photoanode prepared in the invention overcomes the problem of fast photo-induced electron hole recombination of hematite, is improved in photocatalytic performance and stability, and can be better applied to catalytic hydrogen production.

Description

technical field [0001] The invention belongs to the field of catalysis, and in particular relates to a preparation method of a hematite nanorod array photoanode modified by lead zirconate titanate. Background technique [0002] As fossil fuels are decreasing day by day, solar energy, as an inexhaustible clean energy, has become an important part of energy used by human beings. However, the dispersion and instability of solar energy make its utilization efficiency low. On the other hand, hydrogen has a high combustion calorific value and will not produce pollutants after combustion, so hydrogen is known as one of the greenest energy sources in the world. Therefore, solar photocatalytic (electrical) catalytic water splitting to produce hydrogen is one of the ideal ways to solve the current energy shortage and environmental pollution problems. [0003] Hematite (iron oxide α-Fe 2 o 3 ), as a narrow bandgap (~2.1eV) n-type semiconductor, has strong ultraviolet and visible lig...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/06
CPCC25B1/04C25B1/55C25B11/051C25B11/057C25B11/075Y02E60/36
Inventor 王新何晓琳陈志鸿金名亮周国富
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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