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Method for preparing high-performance single-crystal SrTaO2N photo-anode at low temperature

A photoanode and high-performance technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as many defects, effective use of photogenerated carriers, and difficult to control morphology , to achieve the effect of less defects, high carrier separation efficiency and strong repeatability

Active Publication Date: 2021-06-18
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Commonly used SrTaO 2 The preparation method of N is: with Sr 2 Ta 2 o 7 It is obtained by calcination of the precursor in high-temperature ammonia (>950°C). This preparation method has many defects, and the morphology is difficult to control, etc., and this shortcoming does not take advantage of the effective use of photogenerated carriers. [1]

Method used

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  • Method for preparing high-performance single-crystal SrTaO2N photo-anode at low temperature
  • Method for preparing high-performance single-crystal SrTaO2N photo-anode at low temperature
  • Method for preparing high-performance single-crystal SrTaO2N photo-anode at low temperature

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specific Embodiment 1

[0034] (1) Add 0.5g Ta 2 o 5The powder sample is added to a sodium hydroxide solution with a solubility of 1.5M, and the solution is stirred for 2 hours with a magnetic stirrer;

[0035] (2) Transfer the mixed solution obtained in the step (1) to the liner of the hydrothermal kettle, the solution accounts for 80% of the volume of the liner, and put the hydrothermal kettle into an oven at 140° C. for heating for 12 hours;

[0036] (3) When the oven returns to room temperature, take out the hydrothermal kettle, wash and recover the powder sample after 3 times of deionized water, and the powder sample is NaTaO 3 ;

[0037] (4) NaTaO 3 with SrCO 3 Mix and grind at a molar ratio of 1:1, then put the mixed powder into a muffle furnace, and calcinate at 900°C under an ammonia atmosphere, with an ammonia gas flow rate of 800mL min -1 , the time is 10h, the prepared SrTaO 2 N powder sample;

[0038] (5) Preparation of SrTaO by constant voltage electrophoretic deposition 2 N pho...

specific Embodiment 2

[0043] Specific embodiment two: the difference of this embodiment from embodiment one is that the concentration of sodium hydroxide solution is changed to 2-3M, and others are the same as embodiment one.

specific Embodiment 3

[0044] Specific embodiment three: the difference between this embodiment and embodiment one is that the temperature of calcination under ammonia atmosphere is changed to 800-950° C., and the others are the same as in embodiment one.

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Abstract

The invention discloses an experimental method for preparing a high-performance single-crystal SrTaO2N photo-anode at a low temperature. By utilizing the similarity of NaTaO3 and SrTaO2N crystal structures, the problems of high preparation temperature and low solar energy conversion efficiency of the existing SrTaO2N are solved. The preparation method comprises the following steps: preparing a NaTaO3 powder sample by taking Ta2O5 as a raw material through a hydrothermal method; grinding and mixing NaTaO3 powder and SrCO3 powder; putting the mixed powder into a muffle furnace, and calcining in an ammonia gas atmosphere to obtain a SrTaO2N powder sample; preparing the powder sample into a photo-anode film sample by using an electrophoretic deposition method, and subjecting the photo-anode film sample to testing of photocatalytic performance. The preparation method of SrTaO2N provided by the invention has the advantages of low reaction temperature and simplicity in operation. The obtained SrTaO2N sample has the advantages of few defects, high carrier separation efficiency, high solar energy utilization rate and the like.

Description

Technical field: [0001] The invention relates to the field of photocatalytic technology and preparation of oxynitride Background technique: [0002] Photoelectrochemical water splitting to produce hydrogen, which converts solar energy into storable hydrogen energy, is the main means to solve environmental and energy problems in the 21st century. To achieve large-scale utilization of solar water splitting for hydrogen production, the solar-to-hydrogen efficiency (STH) of photoelectrochemical water-splitting cells must be higher than 10%. To achieve 10% STH efficiency, the optical absorption band edge of the semiconductor should be larger than 530nm (ie, the band gap of the semiconductor should be smaller than 2.34eV). SrTaO 2 N has a suitable band gap (2.1eV), conduction band energy level, and can photocatalytically decompose pure water to produce hydrogen in a sacrificial agent-free system. Therefore SrTaO 2 N is a potential visible light photocatalytic material. The ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/20
CPCB01J23/20B01J35/33B01J35/39
Inventor 于鹤陈一新刘进
Owner NANJING TECH UNIV